ASTM D3293-91a(1996)

Specification for PTFE Resin Molded Sheet (Withdrawn 1997)

General Information

• Status: Withdrawn
• Publication Date: 31-Dec-1995
• Technical Committee: D20 - Plastics
• Drafting Committee: D20.15 - Thermoplastic Materials

Standards Content (Sample)

Designation: D 3293 - 91a (Reapproved 1996)
Standard Specification for
1
PTFE Resin Molded Sheet
This standard is issued under the fixed designation D 3293; 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 indicates the year of last reapproval. A
superscript epsilon(•) indicates an editorial change since the last revision or reapproval.
This standard has been approved for use by agencies of the Department of Defense. Consult the iJoD Index of Specifications and
Standards for the specific year of issue which has been adopted by the Department of Defense.
3. Classification
t. Scope
3.1 This specification covers the following four types of
l. l This specification covers molded sheet in minimum
PTFE sheets:
thicknesses of0.794 mm (1/32 in.) manufactured from PTFE
3.1. l Type I-Premium; normally used for exacting elec­
resin molding materials.
trical, mechanical, or chemical applications.
1.2 The values stated in SI units are to be regarded as the
standard. The values in parentheses are for information only. 3.1.2 Type II-General purpose for electrical, mechan­
1.3 The following hazard caveat pertains only to the test ical, and chemical applications not requiring premium
method portion, Section 7, of this specification: T'his stan­
material.
dard does not purport to address all of the safety concerns, if
3. l.3 Type III-Commercial; for noncritical chemical,
any, associated with its use. It is the responsibility of the user
electrical, and mechanical applications.
of this standard to establish appropriate safety and health
3. l.4 Type IV-Utility; having no electrical requirements,
practices and determine the applicability of regulatory limi­
and with mechanical properties at a lower level.
tations prior to use.
3.2 Types I, II, III, and IV may be subdivided into two
grades as follows:
3.2.1 Grade I-made only from virgin resin.
2. Referenced Documents
3.2.2 Grade 2-may be made using reprocessed resin.
3.3 The grades may be further subdivided · into ·three·
2. l ASTM Standards:
classes as follows:
D 149 Test Method for Dielectric Breakdown Voltage and
3.3.l Class A-resistant to thermal dimensional change
Dielectric Strength of Solid Electrical ·Insulating Mate­
not exceeding 0.5 %. , . · . . .
rials at Commercial Power- Frequencies:Z
~.3.2 Class B.,.resistant to thermal dimensional change
D 618 Practice for Conditioning Plastics and Electrical
3
not exceeding 5.0 %. · .· · ·
Insulating Materials for Testing
3
D638 Test Method for Tensile Properties of Plastics 3.3.3 Class C~thermal dimensional change m.,iy exceed
5.0 %. . . ' . · . .
D 792 Test Methods for Specifi~ Gravity (Relati.ve Den­
3
sity) and DensityofPlastics by Displacemeht
3.4 A one-line system may. be used to specify materials
D 1457 Specification for · PTFE Molding and Extrusion
covered by this . specification'. · 'fhe system uses predefined
3
Materials ·
cells to refer to specific aspeets ·. of this specification, as ·
D 1505 Test · Method for Density af Plastics by the
illustrated below. · · ·
3
Density-Gradient Technique
Specification
D 1708 Test Method for Tensile Properties of Plastics by
3 Standard Number Type Grade OaM, Special .
Use of Microtensile Specimens · •
Notes ·
Block
3
D 1898 Practice for Sampling of Plastics
4
D 3892 Practice for Packaging/Packing of Plastics
1
Example: specuication D 4895-89,
E 691 Practice for Conducting an Interlaboratory Study to 6 c
5
Determine the Precision of a Test Method
For this example, the line callout would be Specification
2.2 Military Standard:
D 4895 - 89,I6C,and would specify a coagulated dispersion
MIL-STD-105D Sampling Procedures" and Tables for
form of polytetrafluoro-ethylene that has au· of the properties
6
Inspection by Attributes
listed for that Type, Grade, and Class in the appropriate
specified properties, tables, or both, in the specification
1
identified. A comma is used as the separator between the
This specification is under the jurisdiction of. ASTM 0:>mniittee D-20 on
Plastics," and is the direct responsibility 6f Subcommittee"D20. l 5 on Thermoplastic
Standard Number and the Type. Separators are not needed
Materials (Section 20.15.12). ,
7
between the Type, Grade, and C::Iass. Provision for Special
Current edition approved July 15, 1991. Published September 1991. Originally
Notes is included. so that other information can be provided
published as D 3293 - 74. Last previous edition D 3293 - 91.
2
Annual Book of ASTM Standards, Vol 10.02,
when required. An example would be in Specification
3
Annual Book of ASTM Standalds, Vol 08.01.
D 3295 - 81a where dimensions and tolerances are specifie~
4
Annual Book of ASTM Standards, Vol 08.02.
5
Annual Book of ASTM Standards, Vol 14.02.
6
Available from Sta~dardization Documents, Order Desk, Bldg. 4, Section D;
7
700 Robbi
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