ASTM D7211-13(2018)

Standard Specification for Parts Machined from Polychlorotrifluoroethylene (PCTFE) and Intended for General Use

ABSTRACT
This specification establishes the requirements for finished parts machined from unplasticized polychlorotrifluoroethylene (PCTFE) homopolymers containing regrind and recycled polymer intended for general commercial use. This specification does not cover parts machined from PCTFE copolymers, PCTFE films or tapes, or modified PCTFE containing pigments or plasticizers. Nor does it cover PCTFE parts used in aerospace applications involving storage and handling of oxygen media, air media, inert media, and certain reactive media (specifically ammonia, gaseous hydrogen, and liquid hydrogen), wherein dimensional stability, high molecular weight, molecular weight retention, and crystallinity control are important considerations. Materials shall be tested on and conform accordingly to the following properties: specific gravity; melting point; deformation under load; zero strength time (ZST); annealing performance; and dimensional stability.
SCOPE
1.1 This specification is intended to be a means of calling out finished machined parts ready for commercial use.  
1.2 This specification establishes requirements for parts machined from unplasticized, 100 % polychlorotrifluoroethylene (PCTFE) homopolymers.  
1.3 This specification does not cover parts machined from PCTFE copolymers, PCTFE film or tape less than 0.25-mm (0.010-in.) thick, or modified PCTFE (containing pigments or plasticizers).  
1.4 This specification allows for parts containing regrind and recycled material.  
1.5 The specification does not cover PCTFE parts used in aerospace applications involving storage and handling of oxygen media, air media, inert media, and certain reactive media (specifically ammonia, gaseous hydrogen, and liquid hydrogen), in which dimensional stability, high molecular weight, molecular weight retention, and crystallinity control are important considerations. For aerospace grade, machined PCTFE parts, use Specification D7194.  
1.6 Application—PCTFE parts covered by this specification are made of 100 % PCTFE resin, free of plasticizers, fillers, or other additives. The parts meet specific physical characteristics appropriate for their end use, and are typically used in applications requiring good electrical properties or resistance to aggressive chemical media. General purpose PCTFE parts include seals, gaskets, valve and pump parts (cryogenic and noncryogenic), translucent tubing, sight glasses, flowmeter tubes, heavy-walled solid pipes and fittings, gears, cams, bearings, laboratory ware, circuit boards, electrical connector covers and switches, radome covers, and a variety of other stock shapes. They are removed and replaced during normal maintenance procedures. The parts also experience static or dynamic mechanical loading, and temperatures ranging from cryogenic to temperatures at or above the glass transition temperature, Tg = 55°C (131°F).
Note 1: Quick-quenched PCTFE will potentially exhibit dimensional relaxation in the vicinity of Tg.
Note 2: Although no recommendations are made regarding the limiting upper use temperature of PCTFE, the heat deflection temperature of PCTFE as determined by Test Method D648 is 126°C (259°F).  
1.7 The values stated in SI units are to be regarded as standard. The values in parentheses are for information only.  
1.8 The following precautionary caveat pertains only to the test methods portion, Section 11, 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use.
Note 3: There is no known ISO equivalent to this standard.  
1.9 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of Internat...

General Information

• Status: Historical
• Publication Date: 31-Oct-2018
• ICS: 83.140.01 - Rubber and plastics products in general
• 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: D7211 − 13 (Reapproved 2018)
Standard Specification for
Parts Machined from Polychlorotrifluoroethylene (PCTFE)
1
and Intended for General Use
This standard is issued under the fixed designation D7211; 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 cryogenic to temperatures at or above the glass transition
temperature, T = 55°C (131°F).
g
1.1 This specification is intended to be a means of calling
out finished machined parts ready for commercial use.
NOTE 1—Quick-quenched PCTFE will potentially exhibit dimensional
relaxation in the vicinity of T .
g
1.2 This specification establishes requirements for parts
NOTE 2—Although no recommendations are made regarding the limit-
machined from unplasticized, 100 % polychlorotrifluoroethyl-
ing upper use temperature of PCTFE, the heat deflection temperature of
ene (PCTFE) homopolymers. PCTFE as determined by Test Method D648 is 126°C (259°F).
1.3 This specification does not cover parts machined from 1.7 The values stated in SI units are to be regarded as
standard. The values in parentheses are for information only.
PCTFE copolymers, PCTFE film or tape less than 0.25-mm
(0.010-in.) thick, or modified PCTFE (containing pigments or
1.8 The following precautionary caveat pertains only to the
plasticizers).
test methods portion, Section 11, of this specification: This
standard does not purport to address all of the safety concerns,
1.4 This specification allows for parts containing regrind
if any, associated with its use. It is the responsibility of the user
and recycled material.
of this standard to establish appropriate safety, health, and
1.5 The specification does not cover PCTFE parts used in
environmental practices and determine the applicability of
aerospace applications involving storage and handling of
regulatory limitations prior to use.
oxygen media, air media, inert media, and certain reactive
NOTE 3—There is no known ISO equivalent to this standard.
media (specifically ammonia, gaseous hydrogen, and liquid
hydrogen), in which dimensional stability, high molecular
1.9 This international standard was developed in accor-
weight, molecular weight retention, and crystallinity control
dance with internationally recognized principles on standard-
are important considerations. For aerospace grade, machined
ization established in the Decision on Principles for the
PCTFE parts, use Specification D7194.
Development of International Standards, Guides and Recom-
mendations issued by the World Trade Organization Technical
1.6 Application—PCTFE parts covered by this specification
Barriers to Trade (TBT) Committee.
are made of 100 % PCTFE resin, free of plasticizers, fillers, or
other additives. The parts meet specific physical characteristics
2. Referenced Documents
appropriate for their end use, and are typically used in
2
applications requiring good electrical properties or resistance
2.1 ASTM Standards:
to aggressive chemical media. General purpose PCTFE parts
D618 Practice for Conditioning Plastics for Testing
include seals, gaskets, valve and pump parts (cryogenic and
D648 Test Method for Deflection Temperature of Plastics
noncryogenic), translucent tubing, sight glasses, flowmeter
Under Flexural Load in the Edgewise Position
tubes, heavy-walled solid pipes and fittings, gears, cams,
D792 Test Methods for Density and Specific Gravity (Rela-
bearings, laboratory ware, circuit boards, electrical connector
tive Density) of Plastics by Displacement
covers and switches, radome covers, and a variety of other
D883 Terminology Relating to Plastics
stock shapes. They are removed and replaced during normal
D1430 Classification System for Polychlorotrifluoroethylene
maintenance procedures. The parts also experience static or
(PCTFE) Plastics
dynamic mechanical loading, and temperatures ranging from
D1600 Terminology for Abbreviated Terms Relating to Plas-
tics
1
This specification is under the jurisdiction of ASTM Committee D20 on
Plastics and is the direct responsibility of Subcommittee D20.15 on Thermoplastic
2
Materials. For referenced ASTM standards, visit the ASTM website, www.astm.org, or
Current edition approved Nov. 1, 2018. Published November 2018. Originally contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
approved in 2005. Last previous edition approved in 2013 as D7211 - 13. DOI: Standards volume information, refer to the standard’s Document Summary page on
10.1520/D7211-13R18. the ASTM website.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1
...

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: D7211 − 13 D7211 − 13 (Reapproved 2018)
Standard Specification for
Parts Machined from Polychlorotrifluoroethylene (PCTFE)
1
and Intended for General Use
This standard is issued under the fixed designation D7211; 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*Scope
1.1 This specification is intended to be a means of calling out finished machined parts ready for commercial use.
1.2 This specification establishes requirements for parts machined from unplasticized, 100 % polychlorotrifluoroethylene
(PCTFE) homopolymers.
1.3 This specification does not cover parts machined from PCTFE copolymers, PCTFE film or tape less than 0.25-mm
(0.010-in.) thick, or modified PCTFE (containing pigments or plasticizers).
1.4 This specification allows for parts containing regrind and recycled material.
1.5 The specification does not cover PCTFE parts used in aerospace applications involving storage and handling of oxygen
media, air media, inert media, and certain reactive media (specifically ammonia, gaseous hydrogen, and liquid hydrogen), in which
dimensional stability, high molecular weight, molecular weight retention, and crystallinity control are important considerations.
For aerospace grade, machined PCTFE parts, use Specification D7194.
1.6 Application—PCTFE parts covered by this specification are made of 100 % PCTFE resin, free of plasticizers, fillers, or other
additives. The parts meet specific physical characteristics appropriate for their end use, and are typically used in applications
requiring good electrical properties or resistance to aggressive chemical media. General purpose PCTFE parts include seals,
gaskets, valve and pump parts (cryogenic and noncryogenic), translucent tubing, sight glasses, flowmeter tubes, heavy-walled solid
pipes and fittings, gears, cams, bearings, laboratory ware, circuit boards, electrical connector covers and switches, radome covers,
and a variety of other stock shapes. They are removed and replaced during normal maintenance procedures. The parts also
experience static or dynamic mechanical loading, and temperatures ranging from cryogenic to temperatures at or above the glass
transition temperature, T = 55°C (131°F).
g
NOTE 1—Quick-quenched PCTFE will potentially exhibit dimensional relaxation in the vicinity of T .
g
NOTE 2—Although no recommendations are made regarding the limiting upper use temperature of PCTFE, the heat deflection temperature of PCTFE
as determined by Test Method D648 is 126°C (259°F).
1.7 The values stated in SI units are to be regarded as standard. The values in parentheses are for information only.
1.8 The following precautionary caveat pertains only to the test methods portion, Section 11, 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 safety, health, and healthenvironmental practices and determine the applicability of
regulatory limitations prior to use.
NOTE 3—There is no known ISO equivalent to this standard.
1.9 This international standard was developed in accordance with internationally recognized principles on standardization
established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued
by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
2. Referenced Documents
2
2.1 ASTM Standards:
D618 Practice for Conditioning Plastics for Testing
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.
Current edition approved May 1, 2013Nov. 1, 2018. Published May 2013November 2018. Originally approved in 2005. Last previous edition approved in 20062013 as
D7211 - 06.D7211 - 13. DOI: 10.1520/D7211-13.10.1520/D7211-13R18.
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.
*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.
...