As filed with the Securities and Exchange 
                          Commission on August 27, 1997
                                            Registration No. 333-________
                                                                         

                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C.  20549
                               __________________

                                    FORM S-3 
                             Registration Statement
                                      Under
                           The Securities Act of 1933
                               __________________

                              THERMO FIBERTEK INC.
             (Exact name of registrant as specified in its charter)

                               ------------------

                  Delaware                                52-1762325
        (State or other jurisdiction of                (I.R.S. Employer
        incorporation or organization)                Identification No.)

                               ------------------

                                 81 Wyman Street
                        Waltham, Massachusetts 02254-9046
                                 (617) 622-1000
          (Address, including zip code, and telephone number, including
            area code, of registrant's principal executive offices) 
                               __________________

                          Sandra L. Lambert, Secretary
                              Thermo Fibertek Inc.
                         c/o Thermo Electron Corporation
                                 81 Wyman Street
                                 P. O. Box 9046
                       Waltham, Massachusetts  02254-9046
                                 (617) 622-1000
            (Name, address, including zip code, and telephone number,
                   including area code, of agent for service)

                                   Copies to:
                           Seth H. Hoogasian, Esquire
                                 General Counsel
                              Thermo Fibertek Inc.
                         c/o Thermo Electron Corporation
                                 81 Wyman Street
                       Waltham, Massachusetts 02254-9046 
                              ______________________

             Approximate date of commencement of proposed sale to the
        public:  As soon as practicable after the Registration Statement
        has become effective.
PAGE






             If the only securities being registered on this Form are
        being offered pursuant to dividend or interest reinvestment
        plans, please check the following box.   [   ]

             If any of the securities being registered on this Form are
        to be offered on a delayed or continuous basis pursuant to Rule
        415 under the Securities Act of 1933, other than securities
        offered only in connection with dividend or interest reinvestment
        plans, check the following box.   [ x ] 

             If this Form is filed to register additional securities for
        an offering pursuant to Rule 462(b) under the Securities Act,
        please check the following box and list the Securities Act
        registration statement number of the earlier effective
        registration statement for the same offering.  [   ]

             If this Form is a post-effective amendment filed pursuant to
        Rule 462(c) under the Securities Act, check the following box and
        list the Securities Act registration statement number of the
        earlier effective registration statement for the same offering.
        [   ]

             If delivery of the prospectus is expected to be made
        pursuant to Rule 434, please check the following box.  [   ]

                               __________________

                         CALCULATION OF REGISTRATION FEE

                                   Proposed
          Title of                  Maximum     Proposed
         securities     Amount     Offering     Maximum      Amount of
            to be        to be     Price Per   Aggregate    Registration
         registered   registered     Share   Offering Price     Fee

        Common Stock,
          $.01 par    12,644,628    $11.28    $142,647,210    $43,227
          value per     shares          
           share 

        (1)  Estimated solely for the purpose of calculating the amount
             of the registration fee pursuant to Rule 457(c) based on the
             average of the high and low sales prices of the Common Stock
             on the American Stock Exchange on August 22, 1997.


                            -------------------------
PAGE






             THE REGISTRANT HEREBY AMENDS THIS REGISTRATION STATEMENT ON
        SUCH DATE OR DATES AS MAY BE NECESSARY TO DELAY ITS EFFECTIVE
        DATE UNTIL THE REGISTRANT SHALL FILE A FURTHER AMENDMENT WHICH
        SPECIFICALLY STATES THAT THIS REGISTRATION STATEMENT SHALL
        THEREAFTER BECOME EFFECTIVE IN ACCORDANCE WITH SECTION 8(A) OF
        THE SECURITIES ACT OF 1933 OR UNTIL THIS REGISTRATION STATEMENT
        SHALL BECOME EFFECTIVE ON SUCH DATE AS THE COMMISSION, ACTING
        PURSUANT TO SAID SECTION 8(A), MAY DETERMINE.


PAGE









        PROSPECTUS

                                12,644,628 Shares

                              THERMO FIBERTEK INC.

                                  Common Stock



             This Prospectus relates to the resale of 12,644,628 shares
        (the "Shares") of Common Stock, par value $.01 per share (the
        "Common Stock"), of Thermo Fibertek Inc. (the "Company") issuable
        upon conversion of $153,000,000 principal amount of the Company's
        outstanding 4-1/2% Convertible Subordinated Debentures due 2004
        (the "Debentures").  The Debentures are convertible, at the
        option of the holder (a "Selling Shareholder"), at a conversion
        price of $12.10 per share, subject to adjustment for certain
        events.  The Shares may be offered from time to time in
        transactions on the American Stock Exchange, in negotiated
        transactions, through the writing of options on the Shares, or a
        combination of such methods of sale, at fixed prices that may be
        changed, at market prices prevailing at the time of sale, at
        prices related to such prevailing market prices or at negotiated
        prices.  Such transactions may be effected by the sale of the
        Shares to or through broker-dealers, and such broker-dealers may
        receive compensation in the form of discounts, concessions or
        commissions from the sellers and/or the purchasers of the Shares
        for whom such broker-dealers may act as agent or to whom they
        sell as principal, or both (which compensation to a particular
        broker-dealer might be in excess of customary commissions).  The
        sellers of the Shares and any broker-dealer who acts in
        connection with the sale of Shares hereunder may be deemed to be
        "underwriters" as that term is defined in the Securities Act of
        1933, as amended (the "Securities Act"), and any commission
        received by them and profit on any resale of the Shares as
        principal might be deemed to be underwriting discounts and
        commissions under the Securities Act.

             None of the proceeds from the sale of the Shares will be
        received by the Company.  The Company has agreed to bear all
        expenses (other than underwriting discounts and selling
        commissions, and fees and expenses of counsel or other advisors
        to the sellers of the Shares) in connection with the registration
        and sale of the Shares being registered hereby.  The Company has
        agreed to indemnify the sellers of the Shares against certain
        liabilities, including liabilities under the Securities Act as
        underwriter or otherwise.

                                  _____________


                                        1
PAGE








          THESE SECURITIES HAVE NOT BEEN APPROVED OR DISAPPROVED BY THE
           SECURITIES AND EXCHANGE COMMISSION OR ANY STATE SECURITIES
           COMMISSION NOR HAS THE SECURITIES AND EXCHANGE COMMISSION 
            OR ANY STATE SECURITIES COMMISSION PASSED UPON THE ACCU-
               RACY OR ADEQUACY OF THIS PROSPECTUS. ANY REPRESEN-
                  TATION TO THE CONTRARY IS A CRIMINAL OFFENSE.

                                  _____________

             No dealer, salesman or other person has been authorized to
        give any information or to make any representations other than
        those contained or incorporated by reference in this Prospectus
        regarding the Company or the offering made by this Prospectus,
        and, if given or made, such information or representations must
        not be relied upon as having been authorized by the Company or by
        any other person.  All information contained in this Prospectus
        is as of the date of this Prospectus.  Neither the delivery of
        this Prospectus nor any sale or distribution and resale made
        hereunder shall, under any circumstances, create any implication
        that there has been no change in the affairs of the Company since
        the date hereof.  This Prospectus does not constitute an offer to
        sell or a solicitation of any offer to buy any security other
        than the securities covered by this Prospectus, nor does it
        constitute an offer to or solicitation of any offer to buy any
        security other than the securities covered by this Prospectus,
        nor does it constitute an offer to or solicitation of any person
        in any jurisdiction in which such offer or solicitation may not
        be lawfully made.


        _________, 1997 






















                                        2
PAGE








                              AVAILABLE INFORMATION

             The Company is subject to the informational requirements of
        the Securities Exchange Act of 1934, as amended (the "Exchange
        Act"), and in accordance therewith files reports, proxy
        statements and other information with the Securities and Exchange
        Commission (the "Commission").  Such reports, proxy statements
        and other information can be inspected and copied at the public
        reference facilities maintained by the Commission at 450 Fifth
        Street, N.W., Washington, D.C. 20549, and at the following
        Regional Offices of the Commission:  500 West Madison Street,
        Suite 1400, Chicago, Illinois 60661, and Seven World Trade
        Center, Suite 1300, New York, New York 10048.  Copies of such
        material can also be obtained from the Public Reference Section
        of the Commission at 450 Fifth Street, N.W., Washington, D.C.
        20549 at prescribed rates.  The Commission also maintains a Web
        site at (http:\\www.sec.gov).  The Common Stock of the Company is
        listed on the American Stock Exchange, and the reports, proxy
        statements and other information filed by the Company with the
        Commission can be inspected at the offices of the American Stock
        Exchange, 86 Trinity Place, New York, New York 10006.

             The Company has filed with the Commission a registration
        statement (together with all amendments and exhibits thereto, the
        "Registration Statement") under the Securities Act with respect
        to the securities offered hereby.  This Prospectus does not
        contain all of the information set forth in the Registration
        Statement, certain parts of which are omitted in accordance with
        the rules and regulations of the Commission.  For further
        information, reference is made to the Registration Statement,
        copies of which may be obtained upon payment of the fees
        prescribed by the Commission from the Public Reference Section of
        the Commission at 450 Fifth Street, N.W., Washington, D.C. 20549,
        and at the Commission's regional offices at Seven World Trade
        Center, New York, New York, 10048 and at 500 West Madison Street,
        Chicago, Illinois, 60661.

             The Company undertakes to provide without charge to each
        person to whom a copy of this Prospectus has been delivered, on
        the written or oral request of such person, a copy of any or all
        of the documents that have been or may be incorporated in this
        Prospectus by reference, other than exhibits to such documents
        (unless such exhibits are specifically incorporated by reference
        therein).  Requests for such copies should be directed to:
        Sandra L. Lambert, Secretary, Thermo Fibertek Inc., 81 Wyman
        Street, P. O. Box 9046, Waltham, Massachusetts 02254-9046
        (telephone number:  (617) 622-1000).






                                        3
PAGE






                                   THE COMPANY

             The Company designs and manufactures processing machinery,
        products and accessories for the paper and paper-recycling
        industries.  The Company's principal products include
        custom-engineered systems and equipment for the preparation of
        wastepaper for conversion into recycled paper; accessory
        equipment and related consumables important to the efficient
        operation of papermaking machines; and water-management systems
        essential for draining, purifying and recycling process water.

             The Company's predecessors have been in operation for more
        than 80 years, and the Company has a large, stable customer base
        that includes most papermakers worldwide.  The Company seeks to
        expand its business through the introduction of new products and
        technologies to these customers.  The Company currently
        manufactures its products in several countries in Europe and
        North America, and licenses certain of its products for
        manufacture in South America and the Pacific Rim.

             Recycling Equipment.  The Company develops, designs and
        manufactures custom-engineered systems that remove debris,
        impurities and ink from wastepaper, and process it into a fiber
        mix used to produce either white or brown grades of recycled
        paper.  The Company offers more than 20 products related to all
        aspects of the recycling process, including pulping and trash
        removal systems that convert wastepaper into pulp, thus
        increasing the efficiency of debris removal; poires, or
        scavengers, that remove large debris; cleaning and screening
        systems that remove contaminants such as metals, sand, plastic,
        glue and "stickies" from the pulp mixture; de-inking systems that
        remove ink particles from the pulp mixture; and reject-handling
        and water-treatment systems, including gravity type strainers and
        in-line filtration systems, as well as compactors and sand
        separators designed to recapture "good" fiber rejected with
        debris in the primary process line.

             Accessories.  The Company designs, develops and manufactures
        a wide range of accessories that continuously clean the rolls of
        a papermaking machine, remove the sheet, or web, from the roll,
        automatically cut the web during sheet breaks, and remove curl
        from the sheet.  These functions are critical for paper
        manufacturers because they help avoid potential catastrophic
        damage to the papermaking equipment while reducing expensive
        machine downtime and improving paper quality.  Accessories
        include doctors and related equipment that shed the sheet from
        the roll during sheet breaks and start-ups and keep rolls clean;
        and profiling systems that help ensure a uniform gloss on the web
        and control moisture and curl within the sheet.

             Water-management Systems.  The Company designs, develops and
        manufactures equipment used to drain water from the pulp's
        slurry, form the sheet web and reuse the process water.  The
        systems include formation tables that control the amount of water

                                        4
PAGE






        removed from the pulp slurry to form the paper web; showers and
        felt conditioning systems, used to clean and condition the
        fabrics and felts which in turn are used to transport the paper
        web through various stages of the papermaking machine; and
        water-filtration systems, consisting of pressure, gravity and
        vacuum assisted filters and strainers used to remove extraneous
        contaminants from the process water before reuse and to recover
        reusable fiber for recycling back into the pulp slurry.

             Thermo Fibergen.  The Company's majority-owned Thermo
        Fibergen Inc. subsidiary ("Thermo Fibergen") is currently
        developing equipment and systems to recover materials from
        papermaking sludge generated by plants that produce virgin and
        recycled pulp and paper.  Thermo Fibergen's GranTek Inc.
        subsidiary employs patented technology to produce absorbing
        granules from papermaking sludge.  These granules, marketed under
        the trade name BIODAC (R), are currently used as a carrier to
        deliver agricultural chemicals for professional turf, home lawn
        and garden, agricultural row crop and mosquito-control
        applications.

             The Company faces significant competition in each of its
        principal markets.  The Company competes principally on the basis
        of quality, service, technical expertise, product innovation, and
        price.  The Company believes that the reputation it has
        established since its inception for quality products and in-depth
        process knowledge provides it with a competitive advantage.

        ACQUISITION OF THE STOCK-PREPARATION BUSINESS OF THE BLACK
        CLAWSON COMPANY

             In May 1997, the Company acquired the stock-preparation
        business, excluding the French subsidiary, of the Black Clawson
        Company and its affiliates ("Black Clawson").  In August 1997,
        the Company acquired the stock-preparation business of Black
        Clawson's French subsidiary.  Black Clawson is a leading supplier
        of recycling equipment used in processing fiber for the
        manufacture of "brown paper," such as that used to make
        corrugated boxes and other containers.

             The purchase price for Black Clawson's stock-preparation
        business was approximately $108 million in cash.  The purchase
        price is subject to a post-closing adjustment equal to the amount
        by which the net tangible assets of the business acquired as of
        the closing date are greater or less than, as the case may be,
        certain target amounts set forth in the Asset Purchase Agreement
        dated as of May 22, 1997 between the Company, and certain of its
        affiliates, and the Black Clawson Company, and certain of its
        affiliates.  To finance the acquisition, the Company borrowed
        approximately $110 million from Thermo Electron Corporation
        ("Thermo Electron") at an interest rate equal to the 90-day
        Commercial Paper Composite Rate plus 25 basis points, set at the
        beginning of each quarter. The Company repaid all of such


                                        5
PAGE






        indebtedness with the net proceeds from the sale of the
        Debentures.

             Black Clawson designs, engineers, manufactures and
        distributes paper stock-preparation systems and pulp processing
        systems, which are used in the recycling of waste paper and
        paperboard into wholly or partially recycled paper products and
        in the preparation of virgin pulp and paper.  Black Clawson also
        supplies the customers of its stock-preparation systems with
        replacement and spare parts.  In addition, Black Clawson's
        extensive research and development capabilities allow it to
        provide technologically advanced solutions to its customers'
        needs for pulp processing and stock-preparation systems.  Black
        Clawson can design, engineer and supply substantially all of the
        components of a pulp processing and stock-preparation system for
        its customers.

             Principal Products

             Black Clawson's stock-preparation equipment uses various
        methods, including hydrapulper technology, to prepare waste-paper
        and virgin pulp for recycling and formulation into paper stock.
        The hydrapulper system processes cellulose fibers by blending
        wastepaper with water and chemicals to break larger fibers down
        into individual fibers and fiber bundles, which can then be
        processed and reformulated into paper products.  Other products
        manufactured by Black Clawson include high density cleaning
        systems, used to remove metal and sand from paper to be recycled;
        screening systems, used in processing brown paper stock; pulp
        washers, used in virgin pulp mills to remove chemicals and
        cooking residues from the pulp; stock thickeners, used to drain
        water from paper stock to increase the consistency of the
        finished product; and dispersers, used to break up ink particles
        to facilitate their removal from paper being processed.

             In prior years, approximately one-third of Black Clawson's
        revenue has come from sales of spare parts and service on the
        installed base of its equipment.  Black Clawson has established a
        network of five independent repair and service centers which
        respond to customer requests for repairs or replacements.  These
        centers purchase all required component parts for repairs from
        Black Clawson and replace or repair units to customer
        specifications.

             Sales and Marketing

             Black Clawson uses a multi-faceted approach to the sale and
        marketing of its products, combining direct sales to mills,
        exclusive sales representatives, distribution agreements and
        licensees.  Black Clawson has teams of sales engineers based
        worldwide, who are responsible for the supervision of equipment
        installation, process and equipment troubleshooting, on-site
        customer training, operation and maintenance seminars, and system
        and process optimization at customers' mills.  Black Clawson also

                                        6
PAGE






        relies on an international network of exclusive sales
        representatives and distributors.  In particular, Black Clawson
        has concentrated on developing and strengthening its
        representative and distributor network in Southeast Asia and
        China, as most of the recent growth in the pulp and paper
        industry has been in those areas.

             Integration Strategy

             The Company intends to integrate Black Clawson with its
        existing operations to rationalize the combined manufacturing,
        distribution and administrative functions.  In particular, the
        Company expects to consolidate certain operations in North
        America and Europe.  The Company also intends to take advantage
        of Black Clawson's presence in the Southeast Asia and China
        markets for recycled paper equipment.  There can be no assurance,
        however, that the Company will be able to successfully integrate
        Black Clawson with its existing business.

             Competition

             Black Clawson's major competitors in the market for its
        stock-preparation equipment are Voith Sulzer Papiertechnik GmbH,
        Beloit Corporation, Sunds Defibrator, Maschinen Fabrik Andritz
        AG, Kvaerner Pulping Technologies, Ahlstrom Machine Company, and
        Celleco AB.  Smaller niche suppliers also exist in various
        markets served by Black Clawson.  The principal competitive
        factors in the sale of Black Clawson's paper recycling and
        stock-preparation equipment are technology, product
        differentiation, engineering expertise, price, delivery
        capability, quality and service.

        GENERAL

             The Company was incorporated on November 12, 1991 as a
        wholly owned subsidiary of Thermo Electron.  The Company
        commenced an initial public offering of its Common Stock on
        October 9, 1992.  Thermo Electron owned approximately 88.1% of
        the total outstanding shares of the Company's Common Stock as of
        July 31, 1997.  The Company's principal executive offices are
        located at 81 Wyman Street, Waltham, Massachusetts 02254, and its
        telephone number is (617) 622-1000.


                              SELLING SHAREHOLDERS

             The Selling Shareholders currently hold Debentures
        convertible into the Shares which are the subject of this
        Prospectus.  It is unknown if, when or in what amounts a Selling
        Shareholder may offer Shares for sale and the names of the
        Selling Shareholders who may sell the Shares.  There is no
        assurance that the Selling Shareholders will sell any or all of
        the Shares offered hereby.


                                        7
PAGE






             Because the Selling Shareholders may offer all or some of
        the Shares pursuant to the offering contemplated by this
        Prospectus, and because there are currently no agreements,
        arrangements or understandings with respect to the sale of any of
        the Shares that will be held by the Selling Shareholders after
        completion of this offering, no estimate can be given as to the
        principal amount of the Shares that will be held by the Selling
        Shareholders after completion of this offering.

             Other than as a result of the ownership of the Debentures,
        to the best of the Company's knowledge, none of the Selling
        Shareholders had any material relationship with the Company
        within the three year period ending on the date of this
        Prospectus.


                 INCORPORATION OF CERTAIN DOCUMENTS BY REFERENCE

             The following documents previously filed with the Commission
        are incorporated in this Prospectus by reference:

             (1)  The Company's Annual Report on Form 10-K for the fiscal
                  year ended December 28, 1996, as amended.

             (2)  The Company's Quarterly Report on Form 10-Q for the
                  fiscal quarter ended March 29, 1997.

             (3)  The Company's Current Report on Form 8-K, filed with
                  the Commission on June 4, 1997, as amended by Amendment
                  Nos. 1 and 2 on Form 8-K/A filed with the Commission on
                  June 20, 1997 and August 5, 1997, respectively, with
                  respect to the acquisition of the stock-preparation
                  business of the Black Clawson Company and its
                  affiliates.

             (4)  The Company's Quarterly Report on Form 10-Q for the
                  fiscal quarter ended June 28, 1997.

             (5)  The Company's Current Report on Form 8-K, filed with
                  the Commission on July 16, 1997, with respect to the
                  sale of the Debentures.

             (6)  The description of the Common Stock which is contained
                  in the Company's Registration Statement on Form 8-A,
                  filed under the Exchange Act, as amended.

                  All reports or proxy statements filed by the Company
        pursuant to Sections 13(a), 13(c), 14 or 15(d) of the Exchange
        Act subsequent to the date of this Prospectus and prior to the
        termination of the offering made hereby shall be deemed to be
        incorporated by reference in this Prospectus and to be a part
        hereof from the respective dates of filing such documents.  Any
        statement contained in a document incorporated or deemed to be
        incorporated by reference herein shall be deemed to be modified

                                        8
PAGE






        or superseded for purposes of this Prospectus to the extent that
        a statement contained herein modifies, supersedes or replaces
        that statement.  Any statement so modified or superseded shall
        not be deemed, except as so modified or superseded, to constitute
        a part of this Prospectus.

                                  LEGAL MATTERS

             The validity of the Common Stock offered hereby has been
        passed upon by Carl F. Barnes, Esq., Deputy General Counsel of
        the Company.  Mr. Barnes owns or has the right to acquire,
        pursuant to the exercise of stock options, shares of the Common
        Stock of the Company and the common stock of Thermo Electron, the
        fair market value of which exceeds $50,000.

                                     EXPERTS

             The financial statements of the Company and the
        Stock-Preparation Business of Black Clawson Company and
        Subsidiaries and the financial statement schedule of the Company
        incorporated by reference in the Registration Statement of which
        this Prospectus forms a part have been audited by Arthur Andersen
        LLP, independent public accountants, to the extent and for the
        periods as indicated in their reports with respect thereto, and
        are incorporated herein in reliance upon the authority of said
        firm as experts in giving said reports. 





























                                        9
PAGE






                                     PART II

                     INFORMATION NOT REQUIRED IN PROSPECTUS

             Item 14.  Other Expenses of Issuance and Distribution.

             The expenses incurred by the Company in connection with the
        issuance and distribution of the securities being registered are
        as follows.  All amounts are estimated except the Securities and
        Exchange Commission registration fee and the American Stock
        Exchange listing fee.

                                                               Amount
                                                               ------

        Securities and Exchange Commission Registration Fee    $43,227
        American Stock Exchange listing fee  ................   17,500
        Legal fees and expenses  ............................    1,000

        Accounting fees and expenses  .......................    5,000
        Miscellaneous  ......................................    1,000
             Total  .........................................  $67,727  

                                                         

             Item 15.  Indemnification of Directors and Officers. 

             The Delaware General Corporation Law and the Company's
        Certificate of Incorporation and By-Laws limit the monetary
        liability of directors to the Company and to its stockholders and
        provide for indemnification of the Company's officers and
        directors for liabilities and expenses that they may incur in
        such capacities. In general, officers and directors are
        indemnified with respect to actions taken in good faith in a
        manner reasonably believed to be in, or not opposed to, the best
        interests of the Company, and with respect to any criminal action
        or proceeding, actions that the indemnitee had no reasonable
        cause to believe were unlawful. The Company also has
        indemnification agreements with its directors and officers that
        provide for the maximum indemnification allowed by law.  

             Thermo Electron has an insurance policy which insures the
        directors and officers of Thermo Electron and its subsidiaries,
        including the Company, against certain liabilities which might be
        incurred in connection with the performance of their duties.

             Item 16.  Exhibits.

             See the Exhibit Index included immediately preceding the
        exhibits to this Registration Statement.







                                      II-1
PAGE






             Item 17.  Undertakings.

             (a)  The undersigned Registrant hereby undertakes:

                   (1) To file, during any period in which offers or
                       sales are being made, a post-effective amendment
                       to this registration statement:

                       (i)  To include any prospectus required by Section
                            10(a)(3) of the Securities Act of 1933;

                       (ii) To reflect in the prospectus any facts or
                            events arising after the effective date of
                            the registration statement (or the most
                            recent post-effective amendment thereof)
                            which, individually or in the aggregate,
                            represent a fundamental change in the
                            information set forth in the registration
                            statement.  Notwithstanding the foregoing,
                            any increase or decrease in volume of
                            securities offered (if the total dollar value
                            of securities offered would not exceed that
                            which was registered) and any deviation from
                            the low or high end of the estimated maximum
                            offering range may be reflected in the form
                            of prospectus filed with the Commission
                            pursuant to Rule 424(b) if, in the aggregate,
                            the changes in volume and price represent no
                            more than a 20 percent change in the maximum
                            aggregate offering price set forth in the
                            "Calculation of Registration Fee" table in
                            the effective registration statement;

                       (iii)To include any material information with
                            respect to the plan of distribution not
                            previously disclosed in the registration
                            statement or any material change to such
                            information in the registration statement.

                            Provided, however, that paragraphs (a)(1)(i)
                       and (a)(1)(ii) do not apply if the registration
                       statement is on Form S-3, Form S-8 or Form F-3,
                       and the information required to be included in a
                       post-effective amendment by those paragraphs is
                       contained in periodic reports filed with or
                       furnished to the Commission by the Registrant
                       pursuant to Section 13 or Section 15(d) of the
                       Securities Exchange Act of 1934 that are
                       incorporated by reference in the registration
                       statement.

                  (2)  That, for the purpose of determining any liability
                       under the Securities Act of 1933, each such
                       post-effective amendment shall be deemed to be a
                       new registration statement relating to the

                                      II-2
PAGE






                       securities offered therein, and the offering of
                       such securities at that time shall be deemed to be
                       the initial bona fide offering thereof.

                  (3)  To remove from registration by means of a
                       post-effective amendment any of the securities
                       being registered which remain unsold at the
                       termination of the offering.

             (b)  The undersigned Registrant hereby undertakes that, for
        purposes of determining any liability under the Securities Act of
        1933, each filing of the Registrant's annual report pursuant to
        Section 13(a) or Section 15(d) of the Securities Exchange Act of
        1934 that is incorporated by reference in this registration
        statement shall be deemed to be a new registration statement
        relating to the securities offered herein, and the offering of
        such securities at that time shall be deemed to be the initial
        bona fide offering thereof.

             (c)  Insofar as indemnification for liabilities arising
        under the Securities Act of 1933 may be permitted to directors,
        officers and controlling persons of the Registrant pursuant to
        the foregoing provisions, or otherwise, the Registrant has been
        advised that in the opinion of the Securities and Exchange
        Commission such indemnification is against public policy as
        expressed in the Act and is, therefore, unenforceable.  In the
        event that a claim for indemnification against such liabilities
        (other than the payment by the Registrant of expenses incurred or
        paid by a director, officer or controlling person of the
        Registrant in the successful defense of any action, suit or
        proceeding) is asserted by such director, officer or controlling
        person in connection with the securities being registered, the
        Registrant will, unless in the opinion of its counsel the matter
        has been settled by controlling precedent, submit to a court of
        appropriate jurisdiction the question whether such
        indemnification by it is against public policy as expressed in
        the Act and will be governed by the final adjudication of such
        issue.


















                                      II-3
PAGE






                                   SIGNATURES

             Pursuant to the requirements of the Securities Act of 1933,
        the Registrant hereby certifies that it has reasonable grounds to
        believe that it meets all of the requirements for filing on Form
        S-3 and has duly caused this Registration Statement to be signed
        on its behalf by the undersigned, thereunto duly authorized, in
        the City of Waltham, Commonwealth of Massachusetts, on this 27th
        day of August, 1997.

                                           THERMO FIBERTEK INC.


                                           By:  /s/William A. Rainville
                                                ------------------------
                                                William A. Rainville,
                                                President and Chief
                                                Executive Officer

             KNOW ALL MEN BY THESE PRESENTS that each individual whose
        signature appears below constitutes and appoints John N.
        Hatsopoulos, Paul F. Kelleher, Seth H. Hoogasian, Sandra L.
        Lambert and Melissa F. Riordan, and each of them, as his true and
        lawful attorneys-in-fact and agents for the undersigned, with
        full power of substitution, for and in the name, place and stead
        of the undersigned, to sign and file with the Securities and
        Exchange Commission under the Securities Act of 1933 any and all
        amendments and exhibits to this Registration Statement and any
        and all applications and other documents to be filed with the
        Securities and Exchange Commission pertaining to the registration
        of the securities covered hereby, with full power and authority
        to do and perform any and all acts and things whatsoever
        requisite and necessary or desirable.

             Pursuant to the requirements of the Securities Act of 1933,
        this Registration Statement has been signed by the following
        persons in the capacities and on the dates indicated.


               Signature              Title                 Date
               ---------              -----                 ----
                                                                    

                                President, Chief
                                Executive Officer and
        /s/William A. Rainville Director                 August 27, 1997
        William A. Rainville
                                Vice President, Chief
                                Financial Officer and 
        /s/John N. Hatsopoulos  Director                 August 27, 1997

        John N. Hatsopoulos






                                      II-4
PAGE






               Signature              Title                 Date
               ---------              -----                 ----
                                                                    

                                Chief Accounting
        /s/Paul F. Kelleher     Officer                  August 27, 1997
        Paul F. Kelleher



        /s/Walter J. Bornhorst  Director                 August 27, 1997
        Walter J. Bornhorst


                                Director                 August 27, 1997
        George N. Hatsopoulos


                                Chairman of the Board    August 27, 1997
        /s/Donald E. Noble      and Director
        Donald E. Noble




































                                      II-5
PAGE






                                  EXHIBIT INDEX


        Exhibit                                                Sequential
        Number         Description of Exhibit                   Page No.
        ------         ----------------------                   --------

               
              5.1    Opinion of Carl F. Barnes, Esq.          

             23.1     Consent of Arthur Andersen LLP    
         
             23.2     Consent of Carl F. Barnes, Esq.
                      (contained in Exhibit 5)

             24.1     Power of Attorney (See Signature Page)








        AA972310025







































                                                              EXHIBIT 5.1





                              THERMO FIBERTEK INC.
                                 81 Wyman Street
                                 P. O. Box 9046
                       Waltham, Massachusetts  02254-9046


                                 August 27, 1997


        Thermo Fibertek Inc.
        81 Wyman Street
        P. O. Box 9046
        Waltham, Massachusetts  02254-9046


             Re:  Registration Statement on Form S-3

        Dear Sirs:

             I am Deputy General Counsel to Thermo Fibertek Inc., a
        Delaware corporation (the "Company"), and have acted as counsel
        in connection with the registration under the Securities Act of
        1933, as amended, on Form S-3 (the "Registration Statement"), of
        12,644,628 shares (the "Shares") of Common Stock, par value $.01
        per share, of the Company issuable upon conversion of
        $153,000,000 principal amount of the Company's outstanding 4-1/2%
        Convertible Subordinated Debentures due 2004 (the "Debentures"). 

             I or a member of my staff have reviewed the corporate
        proceedings taken by the Company with respect to the
        authorization of the issuance of the Shares.  I or a member of my
        staff have also examined and relied upon originals or copies,
        certified or otherwise authenticated to my satisfaction, of all
        corporate records, documents, agreements or other instruments of
        the Company and have made all investigations of law and have
        discussed with the Company's representatives all questions of
        fact that I have deemed necessary or appropriate.

             Based upon and subject to the foregoing, I am of the opinion
        that:

             1.   The Company is a corporation duly organized, validly
        existing and in corporate good standing under the laws of the
        State of Delaware.

             2.   The issuance and sale of the Shares as contemplated in
        the Registration Statement have been duly authorized by the
        Company.
PAGE







             3.   The Shares, when issued upon conversion of the
        Debentures, will be validly issued, fully paid and nonassessable.

             I hereby consent to the filing of this opinion as Exhibit
        5.1 to the Registration Statement.

                                           Very truly yours,




                                           /s/ Carl F. Barnes
                                           Deputy General Counsel

        CFB/bb





















                                                     Exhibit 23.1

                    Consent of Independent Public Accountants
                    -----------------------------------------


             As independent public accountants, we hereby consent to the
        incorporation by reference in this registration statement of our
        report dated February 3, 1997 (except with respect to the matter
        discussed in Note 14 as to which the date is February 26, 1997),
        included in Thermo Fibertek Inc.'s Form 10-K, for the year ended
        December 28, 1996, and our report dated August 4, 1997, for the
        stock-preparation business of Black Clawson Company and
        Subsidiaries included in Thermo Fibertek Inc.'s Current Report on
        Form 8-K/A dated May 22, 1997 (as amended June 20, 1997 and
        August 5, 1997), and to all references to our Firm included in
        this registration statement.




                                                Arthur Andersen LLP

        Boston, Massachusetts