as 1196-1973 polytetrafluoroethylene (ptfe) moulded sheet

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    AS 11961973

    Australian Standard

    POLYTETRAFLUOROETHYLENE(PTFE)MOULDED SHEET

    METRIC UNITS

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    The following scientif ic, industrial and governmental organizations and departmentswere officially represented on the committee entrusted with the preparation of t hisstandard:

    Australian Post Office

    Australian Pump Manufacturers AssociationElectronic Association of Australia

    National Association of Australian State Road Authorities

    Petroleum Refinery Engineers Advisory Committee

    Plastics Institute of Australia

    This standard, pr epared by Committee PL/29, Polytetrafluoroethylene Materials, wasapproved on behalf of the Council of the S tandards Association of Australia on17 November 1972.

    Review of Austr alia n Standards. To keep abreast of progress in industry, Australian Standards are subject to periodic review and are kept up to date by the issue of amendments or new editions as necessary. It isimportant therefore that Standards users ensure that they are in possession of the latest edition, and anyamendments thereto.

    Full details of all Australian Standards and related publications will be found in the Standards A ustraliaCatalogue of Publications; this information is supplemented each month by the magazine The AustralianStandard, which subscribing m embers receive, and which gives details of new publications, new editi onsand amendments, and of withdrawn Standards.

    Suggestions for improvements t o Australian Standards, addressed to the head office of Standards Australia,are welcomed. Notification of any inaccuracy or ambiguity found in an Australian Standard should be madewithout delay in order that the matter may be investigated and appropriate action taken.

    This standard was issued in draft form for public review as Doc. 1880.

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    AS 11961973

    Australian Standard

    POLYTETRAFLUOROETHYLENE(PTFE) MOULDED SHEET

    First published . . . . . . . . . . . . . . . . . . . . . . . . 1973Reconfirmed . . . . . . . . . . . . . . . . . . . . . . . . . . 1986

    Incorporating:Corrig.1976

    PUBLISHED BY STANDARDS AUSTRALIA(STANDARDS ASSOCIATION OF AUSTRALIA)1 THE CRESCENT, HOMEBUSH, NSW 2140

    ISBN 0 7262 4913 0

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    AS 11961973 2

    PREFACE

    This standard was prepared under the authority of the Plastics Industry StandardsCommittee and is one of a series of standards relating to PTFE products.

    A preliminary draft was prepared by the National Fluorocarbon Division of the PlasticsInstitute of Australia.

    This standard specifies the classification and composition of the moulded sheet, finish,and physical and electrical requirements.

    This standard may require reference to the following standards:

    AS 1145 Method for the Determination of Tensile Properties of PlasticsMaterials

    AS 1193 Method for the Determination of the Density and Relative Density(Specific Gravity) of P lastics excluding Cellular Plastics*

    AS 1255 Methods of Test for Electrical Characteristics of Solid PlasticsInsulating Material*

    ASTM D1708 Method of Test for Tensile Properties of Plastics by use of Microtensile Specimens.

    * In course of preparation.

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    3 AS 1 1961973

    STANDARDS ASSOCIATION OF AUSTRALIA

    Australian Standard Specificationfor

    POLYTETRAFLUOROETHYLENE (PTFE)MOULDED SHEET

    1 SC OPE . This specification applies to moulded polytetrafluoroethylene (PTFE)sheet of minimum thickness 2.4 mm for mechanical, electrical and chemicalapplications. It does not apply to skived tape.

    NOTE: For applications requiring sheet of thickness less than 2.4 mm it is recommended t hat skived tapebe used.

    2 COMPOSITION. The moulded sheet shall be manufactured from unpigmented,PTFE resin and shall be free from any foreign material.

    3 CLASSIFICATION. PTFE sheet shall be classified as follows:

    Grade A premium quality moulded sheet of which the properties shall complywith the Grade A requirements of Table 1.

    Grade B general purpose moulded sheet of which the properties shall comply withthe Grade B requirements of Table 1.

    Grade C mechanical grade moulded sheet for non-critical applications of whichthe properties shall comply with the Grade C requirements of Table 1.

    Class 1 Grade A, B or C moulded sheet conforming to the dimensional stabilityrequirements of Cl ause 12.

    Class 2 Grade A, B or C moulded sheet without specific requirement fordimensional stabilit y.

    NOTE: It is recommended that purchasing specifications should r efer to the above classifications.

    4 CONDITIONING. Samples for test shall be conditioned for 24 h at 23 2C.

    NOTES:

    1. PTFE mouldings do not absorb moisture so a humidity control requirement is not specified.

    2. PTFE undergoes a transition during which there is a significant volume change in the material. Themajority of this change occurs between 19 and 20 C.

    5 APPEARANCE AND FINISH. The colour of the sheet may vary from white tomottled grey and the sheet shall be free from obvious surface defects and inclusionsthat could affect its serviceability.

    6 INTERNAL DEFECTS. The sheet shall be substantially homogeneous and freefrom internal defects likely to affect its serviceability. Methods of test and acceptablelimits shall be agreed between purchaser and supplier.

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