As 1195-1973 Polytetrafluoroethylene (PTFE) Skived Tape

7/31/2019 As 1195-1973 Polytetrafluoroethylene (PTFE) Skived Tape

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AS 11951973

Australian Standard

POLYTETRAFLUOROETHYLENE(PTFE)

SKIVED TAPE

METRIC UNITS


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The following scientif ic, industrial and governmental organizations and departments

were officially represented on the committee entrusted with the preparation of t his

standard:

Australian Post Office

Australian Pump Manufacturers Association

Electronic 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 Standa rds. To keep abreast of progress in industry, Australian Standards are subjectto 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 wil l be found in the Standards AustraliaCatalogue of Publications; this information is supplemented each month by t he magazine T he AustralianStandard, which subscribing members receive, and which gives details of new publications, new editionsand amendments, and of withdrawn Standards.

Suggestions for improvements t o Australian Standards, addressed to the head office of Standards Australia,are welcomed. N otification 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. 1879.


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AS 11951973

Australian Standard

POLYTETRAFLUOROETHYLENE(PTFE)

SKIVED TAPE

First published . . . . . . . . . . . . . . . . . . . . . . . . 1973

Incorporating:Corrig.1976

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

ISBN 0 7262 4905 X


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AS 11951973 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 N ational F luorocarbon Division of thePlastics Institute of Australia. In preparing the standard cognizance was taken ofBS Draft 68/1323, Polyetrafluoroethylene Skived Tape.

This standard specifies the classification and composition of skived tape, includingfinish, and physical and electrical characteristics required of the tape.

Attention is drawn t o the fact that skived tape may be used or referred to as P TFEsheet in its larger sizes.

This standard makes reference to the following Australian and Americanstandards:

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 Materials*

ASTM D1708 Method of Test for Tensile Properties of Plastics by Use ofMicrotensile Specimens.

* In course of preparation.


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3 AS 11951973

STANDARDS ASSOCIATION OF AUSTRALIA

Australian Standard Specification

for

POLYTETRAFLUOROETHYLENE (PTFE) SKIVED TAPE

1 SC OPE . This specification applies to polytetrafluoroethylene (PTFE)skived tapein a range of thicknesses up to 5.0 mm, for mechanical, electrical and chemicalapplications.

2 COMPOSITION. The tape shall be manufactured from unpigmented PTFE resinand shall be free from any foreign material.

3 CLASSIFICATION. PTFE tape shall be classified as follows:

Grade A premium quality tape of which the properties shall comply with theGrade A requirements of Table 1.

Grade B general purpose tape of which the properties shall comply with theGrade B requirements of Table 1.

Grade C a tape for use in non-critical applications of which the propertiesshall comply with the Grade C requirements of Table 1.

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 does not absorb moisture so a requirement for control of humidity is not specified.

2. PTFE undergoes a transition during which there is a significant volume change in thematerial. The majority of this change occurs between 19 and 20C.

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

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

7 DIMENSIONS AND TOLERANCES. The tolerance on nominal length andwidth of skived tape shall be 0, +1.5 mm.

The tolerance on thickness shall conform to T able 2. The thickness shall bedetermined with a dial-gauge micrometer provided with a flat foot of minimum area36 mm2 which applies a pressure of 15 to 30 kPa to the specimen.

8 TENSILE STRENGTH AND ELONGATION AT BREAK. Test specimenshaving the form and dimensions shown in Fig. 1 shall be cut from the tape in the


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As 1195-1973 Polytetrafluoroethylene (PTFE) Skived Tape