ASTM D1457-92

Specification for Polytetrafluorethylene (PTFE) Molding and Extrusion Materials (Withdrawn 1996)

General Information

• Status: Withdrawn
• ICS: 83.080.20 - Thermoplastic materials
• Technical Committee: D20 - Plastics
• Drafting Committee: D20.15 - Thermoplastic Materials

Standards Content (Sample)

ASTM D3457 92 = 0759530 0535368 269
AMERICAN SOCIETY FOR TESTING AND MATERIALS An American Nalional Standard
#Tb Designation: D 1457 - 92
191 6 Race St Phlladelphia, Pa 191 03
Reprinted from the Annwl Book of ASTM Standards. Copyright ASTM
if not listed In the current wmblned index, will appear in the next edfin.
Standard Specification for
Polytetrafluoroethylene (PTFE) Molding and Extrusion
Materials'
This standard is issued under the fixed designaiion D 1457; the number immediately following the designation indicates the year of
original adoption or, in the case of revision. the year of last revision. A number in parentheses indicatcs the year of last reapproval. A
superscript epsilon (0 indicates an editorial change since the last revision or reapproval.
This standard lias been approved for use by agencies o] !he Depur~nieni of Dejnsr IO repluce L-P-403c. Cunsiilt rlie DoD ín(1e.r if
Specijicarions and Standards for the specijic year which has been adopted by tlie Deparlriierir ($Definse.
D 1895 Test Methods for Apparent Density, Bulk Facfor,
1. Scope
and Pourability of Plastic Materials4
1.1 This specification covers molding and extrusion resins
D 1898 Practice for Sampling of Plastics4
of polytetrafluoroethylene (PTFE) that have never been
D 3297 Practice for Molding and Matching Tolerances for
melted after preforming or molding and are normally
PTFE Resin Partss
proccsscd by methods similar to those uscd in powder
D 3892 Practice for Packaging/Packing of Plastics5
metallurgy or ceramics, or by ram extrusion or extrusion
D4052 Test Method for Density and Relative Density of
with a volatile aid. These PTFE resins are homopolymers of
Liquids By Digital Density Meter6
tetrafluoroethylene or copolymers containing not more than
D 459 1 Test Method for Determining Temperatures and
1 % by weight of other fluoromonomers. The usual methods
Heats of Transitions of Fluoropolymers by Differential
of processing thermoplastics generally are not applicable to
Scanning Calorimetry5
these materials because of their viscoelastic properties at
E il Specification for Wire-Cloth Sieves for Testing
processing temperatures. The materials included herein do
Purposes'
not include mixtures of PTFE resin with additives such as
E 177 Practice for Use of the Terms Precision and Bias in
colorants, fillers, plasticizers, any fabricated articles, or
ASTM Test Methods*
reprocessed or reground resin. The methods and properties
E 380 Practice for Use of the International System of
included are those required to identify the various types of
Units (SI)8
resins. Additional procedures are provided in Appendix X 1
E 691 Practice for Conducting an Interlaboratory Study to
for further characterization of the resins.
Determine the Precision of a Test Methods
1.2 The values stated in SI units as detailed in Practice
2.2 Military Standard?
E 380 are to be regarded as the standard, and the practices of
MIL-STD-I05 Sampling Procedures and Tables for In-
E 380 are incorporated herein.
spection by Attributes
1.3 The following precautionary caveat pertains only to
the test methods portion, Section 13, of this specification:
3. Terminology
This standard does not purport to address all of the safety
if any, associated with its use. It is the responsi-
problems,
3.1 Dejnitions:
bility OS the user of this standard to establish appropriate
3.1.1 General-The terminology given in Terminology
safety and health practices and determine the applicability of
D 883 is applicable to this specification.
regulatory limitations prior to use.
3.2 Descriptions of Tenns Specific to This Standasd:
3.2.1 bulk density, @)-the weight in grams of a volume
of 1000 mL of resin measured under the conditions of the
2. Referenced Documents
test.
2.1 ASTM Standards: 3.2.2 extended specific graviiy, (ri)-the specific gravity of
D 6 18 Practice for Conditioning Plastics and Electrical a specimen of PTFE material molded as described in this
Insulating Materials for Testing2 specification and sintered for an extended period of time,
compared to the sintering time for the measurement of SSG
D 638 Test Method for Tensile Properties of Plastics2
using the appropriate sintering schedule given in this specifi-
D792 Test Methods for Specific Gravity (Relative Den-
of Plastics by Displacement2 cation.
sity) and Density
3.2.3 preforming, (n)-compacting powdered PTFE mate-
D 883 Terminology Relating to Pla~tics~.~
rial under pressure in a mold to produce a solid object, called
D 1505 Test Method for Density of Plastics by the
a preform, that is capable of being handled. Molding and
Density-Gradient Technique2
Anarrnl Book ufASTM Siandurds, Vol 08.02.
I This specification is under the jurisdiction of ASTM Committee D-20 on
Plastics and is the direct responsibility of Subcommittee D20.15 on Thermoplastic Anninul Book oJASTM Siandurds, Vol 08.03.
Materials, and subsection 12 on Fluoropolymen. Anriiial Boo
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