ASTM D3294-15

Standard Specification for Polytetrafluoroethylene (PTFE) Resin Molded Sheet and Molded Basic Shapes

ABSTRACT
This specification establishes the requirements and test methods for the material, dimensions, and workmanship, and the physical and electrical properties of molded sheet manufactured from polytetrafluoroethylene (PTFE) resin molding materials and molded basic shapes made from resin molding and extrusion materials. The sheet or molded basic shape shall be made from unpigmented PTFE and shall be free from foreign matters. Each of the samples shall undergo visual and dimensional inspection to verify their compliance with the standard requirements. The specimens shall conform to the following physical and electrical property requirements: tensile strength; elongation; dielectric strength; specific gravity; porosity; and melting point. Examination for internal defects shall also be conducted to ensure that the specimens are free from microscopic cracks, voids, inclusions, and other surface defects that might affect the serviceability of the materials.
SCOPE
1.1 This specification establishes requirements and methods of test for the material, dimensions, and workmanship, and the physical and electrical properties of molded sheet in minimum thicknesses of 0.794 mm (1/32 in.) manufactured from PTFE resin molding materials defined in Specification D4894.  
1.2 This specification also establishes requirements for molded basic shapes made from molding materials. This specification is for products 300 mm (12 in.) or less in a dimension parallel to and 12.7 mm (0.5 in.) or greater in the dimension perpendicular to the direction of the applied molding pressure.  
1.3 The values stated in SI units are to be regarded as the standard.  
1.4 The following precautionary caveat pertains only to the test method portion, Section 7, of this specification. This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. Special attention is called to 13.2, 13.3, 13.6, 13.8, and A1.  
Note 1: There is no known ISO equivalent to this standard.

General Information

• Status: Historical
• Publication Date: 31-Aug-2015
• ICS: 83.140.99 - Other rubber and plastics products
• Technical Committee: D20 - Plastics
• Drafting Committee: D20.15 - Thermoplastic Materials

Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation:D3294 −15
Standard Specification for
Polytetrafluoroethylene (PTFE) Resin Molded Sheet and
1
Molded Basic Shapes
This standard is issued under the fixed designation D3294; 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.
3
1. Scope* lation (Withdrawn 2013)
D618 Practice for Conditioning Plastics for Testing
1.1 This specification establishes requirements and methods
D638 Test Method for Tensile Properties of Plastics
of test for the material, dimensions, and workmanship, and the
D792 Test Methods for Density and Specific Gravity (Rela-
physical and electrical properties of molded sheet in minimum
tive Density) of Plastics by Displacement
1
thicknesses of 0.794 mm ( ⁄32 in.) manufactured from PTFE
D883 Terminology Relating to Plastics
resin molding materials defined in Specification D4894.
D1600 Terminology forAbbreviatedTerms Relating to Plas-
1.2 This specification also establishes requirements for
tics
molded basic shapes made from molding materials. This
D1708 Test Method forTensile Properties of Plastics by Use
specification is for products 300 mm (12 in.) or less in a
of Microtensile Specimens
dimension parallel to and 12.7 mm (0.5 in.) or greater in the
D3892 Practice for Packaging/Packing of Plastics
dimension perpendicular to the direction of the applied mold-
D4591 Test Method for Determining Temperatures and
ing pressure.
Heats of Transitions of Fluoropolymers by Differential
Scanning Calorimetry
1.3 The values stated in SI units are to be regarded as the
D4894 Specification for Polytetrafluoroethylene (PTFE)
standard.
Granular Molding and Ram Extrusion Materials
1.4 The following precautionary caveat pertains only to the
D5947 Test Methods for Physical Dimensions of Solid
test method portion, Section 7, of this specification. This
Plastics Specimens
standard does not purport to address all of the safety concerns,
E94 Guide for Radiographic Examination
if any, associated with its use. It is the responsibility of the user
IEEE/ASTM SI-10 American National Standard for Use of
of this standard to establish appropriate safety and health
theInternationalSystemofUnits(SI):TheModernMetric
practices and determine the applicability of regulatory limita-
System
tions prior to use.Specialattentioniscalledto13.2,13.3,13.6,
13.8, and A1.
3. Terminology
NOTE 1—There is no known ISO equivalent to this standard. 3.1 Definitions:
3.1.1 Definitions are in accordance with Terminology D883
2. Referenced Documents
unless otherwise specified.
2 3.1.2 lot, n—one continuous production run or a uniform
2.1 ASTM Standards:
blend of two or more production runs of one size sheet or
D149 Test Method for Dielectric Breakdown Voltage and
molded basic shape.
DielectricStrengthofSolidElectricalInsulatingMaterials
at Commercial Power Frequencies 3.2 Abbreviations:
D374 Test Methods for Thickness of Solid Electrical Insu- 3.2.1 Abbreviations are in accordance with Terminology
D1600.
4. Classification
1
This specification is under the jurisdiction of ASTM Committee D20 on
4.1 This specification covers the following four types of
Plastics and is the direct responsibility of Subcommittee D20.15 on Thermoplastic
Materials (Section D20.15.12).
molded basic sheets and shapes:
Current edition approved Sept. 1, 2015. Published September 2015. Originally
4.1.1 Type I—Premium; normally used for exacting
approved in 1974. Last previous edition approved in 2009 as D3294 - 09. DOI:
electrical, mechanical, or chemical applications.
10.1520/D3294-15.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
3
Standards volume information, refer to the standard’s Document Summary page on The last approved version of this historical standard is referenced on
the ASTM website. www.astm.org.
*A Summary of Changes section appears at the end of this standard
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

---------------------- Page: 1 ----------------------
D3294−15
A
TABLE 1 Physical and Electrical Requirements for PTFE Sheets
4.1.2 Type II—General purpose; for electrical, mechanical,
Dielectric
and chemical applications not requiring premium material.
Tensile Elonga-
C
B
Specific
Strength D
A A
Types Strength tion (min) Porosity
4.1.3 Type III—Mechanical Grade; for non-critical
Gravity
(min) Volts
(min) psi Percent
Per Mill
chemical, electrical, and mechanical applications.
E
I 4500 300 600 2.15 to 2.18 Zero penetration
4.1.4 Type IV—Utility; having no electrical requirements
II 3000 2
...

This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation: D3294 − 09 D3294 − 15
Standard Specification for
Polytetrafluoroethylene (PTFE) Resin Molded Sheet and
1
Molded Basic Shapes
This standard is issued under the fixed designation D3294; 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.
1. Scope*
1.1 This specification establishes requirements and methods of test for the material, dimensions, and workmanship, and the
1
physical and electrical properties of molded sheet in minimum thicknesses of 0.794 mm ( ⁄32 in.) manufactured from PTFE resin
molding materials.materials defined in Specification D4894.
1.2 This specification also establishes requirements for molded basic shapes made from molding and extrusion materials. This
specification is for products 300 mm (12 in.) or less in a dimension parallel to and 12.7 mm (0.5 in.) or greater in the dimension
perpendicular to the direction of the applied molding pressure.
1.3 The values stated in SI units are to be regarded as the standard.
1.4 The following precautionary caveat pertains only to the test method portion, Section 7, of this specification.This standard
does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this
standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to
use.Special attention is called to 13.2, 13.3, 13.6, 13.8, and A1.
NOTE 1—There is no known ISO equivalent to this standard.
2. Referenced Documents
2
2.1 ASTM Standards:
D149 Test Method for Dielectric Breakdown Voltage and Dielectric Strength of Solid Electrical Insulating Materials at
Commercial Power Frequencies
3
D374 Test Methods for Thickness of Solid Electrical Insulation (Withdrawn 2013)
D618 Practice for Conditioning Plastics for Testing
D638 Test Method for Tensile Properties of Plastics
D792 Test Methods for Density and Specific Gravity (Relative Density) of Plastics by Displacement
D883 Terminology Relating to Plastics
D1600 Terminology for Abbreviated Terms Relating to Plastics
D1708 Test Method for Tensile Properties of Plastics by Use of Microtensile Specimens
D3892 Practice for Packaging/Packing of Plastics
D4591 Test Method for Determining Temperatures and Heats of Transitions of Fluoropolymers by Differential Scanning
Calorimetry
D4894 Specification for Polytetrafluoroethylene (PTFE) Granular Molding and Ram Extrusion Materials
D5947 Test Methods for Physical Dimensions of Solid Plastics Specimens
E94 Guide for Radiographic Examination
IEEE/ASTM SI-10 American National Standard for Use of the International System of Units (SI): The Modern Metric System
3. Terminology
3.1 Definitions:
3.1.1 Definitions are in accordance with Terminology D883 unless otherwise specified.
1
This specification is under the jurisdiction of ASTM Committee D20 on Plastics and is the direct responsibility of Subcommittee D20.15 on Thermoplastic Materials
(Section D20.15.12).
Current edition approved Nov. 1, 2009Sept. 1, 2015. Published December 2009September 2015. Originally approved in 1974. Last previous edition approved in 20032009
as D3294 - 03.D3294 - 09. DOI: 10.1520/D3294-09.10.1520/D3294-15.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
3
The last approved version of this historical standard is referenced on www.astm.org.
*A Summary of Changes section appears at the end of this standard
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

---------------------- Page: 1 ----------------------
D3294 − 15
3.1.2 lot, n—one continuous production run or a uniform blend of two or more production runs of one size sheet or molded basic
shape.
3.2 Abbreviations:
3.2.1 Abbreviations are in accordance with Terminology D1600.
4. Classification
4.1 This specification covers the following four types of molded basic sheets and shapes:
4.1.1 Type I—Premium; normally used for exacting electrical, mechanical, or chemical applications.
4.1.2 Type II—General purpose; for electrical, mechanical, and chemical applications not requiring premium material.
4.1.3 Type III—Mechanical
...