ASTM D7194-19
(Specification)Standard Specification for Aerospace Parts Machined from Polychlorotrifluoroethylene (PCTFE)
Standard Specification for Aerospace Parts Machined from Polychlorotrifluoroethylene (PCTFE)
ABSTRACT
This specification establishes the requirements for parts intended for aerospace use and machined from polychlorotrifluoroethylene (PCTFE) homopolymers. This specification, however, does not cover parts machined from PCTFE copolymer, PCTFE film or tape, or modified PCTFE. Material covered by this specification is on four types, differentiated based on intended uses and exposures: Types I (high service pressure) and II (low service pressure) for use in air and oxygen media, Type II for use in inert and reactive media, and Type IV for use in other media. The parts shall be manufactured from virgin, unplasticized, pure PCTFE homopolymer, and the use of recycled polymer or regrind shall be prohibited. The base material shall be free of defects and contaminants. The finished parts shall be white or gray in color with a natural translucent appearance, and shall be free of voids, scratches, fissures, inclusions, or entrapped air bubbles. Tests for specific gravity, melting point, tensile strength and elongation, deformation under load, zero strength time, mechanical impact (in ambient liquid oxygen and pressurized liquid and gaseous oxygen environments), and dimensional stability shall be performed and shall conform to the requirements specified.
SCOPE
1.1 This specification is intended to be a means of calling out finished machined parts ready for aerospace use. Such parts may also find use in selected commercial applications where there are clear benefits derived from the use of parts with high molecular weight, good molecular weight retention during processing, dimensional stability, controlled crystallinity, and tightly controlled engineering tolerances.
1.2 This specification establishes requirements for parts machined from virgin, 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 does not allow parts containing recycled material.
1.5 The specification does not cover PCTFE parts intended for general use applications, in which control of dimensional stability, molecular weight, and crystallinity are not as important. For machined PCTFE parts intended for general use, use Specification D7211.
1.6 This specification classifies parts into three classes based upon intended uses and exposures: oxygen-containing media, reactive media, and inert media.
1.7 Application—PCTFE components covered by this specification are virgin, 100 % PCTFE resin, free of plasticizers and other additives. The components are combustion resistant in oxygen, dimensionally stable, and meet other specific physical characteristics appropriate for their end use. They are used in valves, regulators, and other devices in oxygen, air, helium, nitrogen, hydrogen, ammonia, and other aerospace media systems. The components typically are used as valve seats, o-rings, seals, and gaskets. They are removed and replaced during normal maintenance procedures. The components provide reliable sealing surfaces resulting in proper closure of valves and related devices and no leakage from the system into the environment. They will experience static mechanical loading, cyclic mechanical loading, temperatures ranging from cryogenic to 71°C (160°F), and pressures up to 68.9 MPa (10,000, psig) for oxygen and air media, and 103.4 MPa (15,000 psig) for inert media.
1.8 The values stated in SI units are to be regarded as standard. The values in parentheses are for information only.
1.9 The following precautionary caveat pertains only to the test methods portion, Section 13, 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 pra...
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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.
Designation:D7194 −19
Standard Specification for
Aerospace Parts Machined from Polychlorotrifluoroethylene
1
(PCTFE)
This standard is issued under the fixed designation D7194; 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 during normal maintenance procedures. The components pro-
vide reliable sealing surfaces resulting in proper closure of
1.1 This specification is intended to be a means of calling
valves and related devices and no leakage from the system into
outfinishedmachinedpartsreadyforaerospaceuse.Suchparts
the environment. They will experience static mechanical
may also find use in selected commercial applications where
loading, cyclic mechanical loading, temperatures ranging from
there are clear benefits derived from the use of parts with high
cryogenic to 71°C (160°F), and pressures up to 68.9 MPa
molecular weight, good molecular weight retention during
(10,000, psig) for oxygen and air media, and 103.4 MPa
processing, dimensional stability, controlled crystallinity, and
(15,000 psig) for inert media.
tightly controlled engineering tolerances.
1.8 The values stated in SI units are to be regarded as
1.2 This specification establishes requirements for parts
standard. The values in parentheses are for information only.
machined from virgin, unplasticized, 100 % polychlorotrifluo-
1.9 The following precautionary caveat pertains only to the
roethylene (PCTFE) homopolymers.
test methods portion, Section 13, of this specification: This
1.3 This specification does not cover parts machined from
standard does not purport to address all of the safety concerns,
PCTFE copolymers, PCTFE film or tape less than 0.25-mm
if any, associated with its use. It is the responsibility of the user
(0.010-in.) thick, or modified PCTFE (containing pigments or
of this standard to establish appropriate safety, health, and
plasticizers).
environmental practices and determine the applicability of
1.4 This specification does not allow parts containing re-
regulatory limitations prior to use.
cycled material.
NOTE 1—There is no known ISO equivalent to this standard.
1.5 The specification does not cover PCTFE parts intended
1.10 This international standard was developed in accor-
for general use applications, in which control of dimensional
dance with internationally recognized principles on standard-
stability, molecular weight, and crystallinity are not as impor-
ization established in the Decision on Principles for the
tant. For machined PCTFE parts intended for general use, use
Development of International Standards, Guides and Recom-
Specification D7211.
mendations issued by the World Trade Organization Technical
1.6 This specification classifies parts into three classes
Barriers to Trade (TBT) Committee.
based upon intended uses and exposures: oxygen-containing
2. Referenced Documents
media, reactive media, and inert media.
2
2.1 ASTM Standards:
1.7 Application—PCTFEcomponentscoveredbythisspeci-
D618 Practice for Conditioning Plastics for Testing
fication are virgin, 100 % PCTFE resin, free of plasticizers and
D638 Test Method for Tensile Properties of Plastics
other additives. The components are combustion resistant in
D792 Test Methods for Density and Specific Gravity (Rela-
oxygen, dimensionally stable, and meet other specific physical
tive Density) of Plastics by Displacement
characteristics appropriate for their end use. They are used in
D883 Terminology Relating to Plastics
valves, regulators, and other devices in oxygen, air, helium,
D1204 Test Method for Linear Dimensional Changes of
nitrogen, hydrogen, ammonia, and other aerospace media
Nonrigid Thermoplastic Sheeting or Film at Elevated
systems. The components typically are used as valve seats,
Temperature
o-rings, seals, and gaskets. They are removed and replaced
D1430 ClassificationSystemforPolychlorotrifluoroethylene
(PCTFE) Plastics
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 Aug. 1, 2019. Published August 2019. Originally contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
approved in 2005. Last previous edition approved in 2012 as D7194 - 12. DOI: Standards volume information, refer to the standard’s Document Summary page on
10.1520/D7194-19. the ASTM website.
Copyright
...
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: D7194 − 12 D7194 − 19
Standard Specification for
Aerospace Parts Machined from Polychlorotrifluoroethylene
1
(PCTFE)
This standard is issued under the fixed designation D7194; 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 is intended to be a means of calling out finished machined parts ready for aerospace use. Such parts may
also find use in selected commercial applications where there are clear benefits derived from the use of parts with known or
controlled crystallinity, high molecular weight, good molecular weight retention during processing, dimensional stability in the
finished part, stability, controlled crystallinity, and tightly controlled engineering tolerances.
1.2 This specification establishes requirements for parts machined from virgin, 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 does not allow parts containing recycled material.
1.5 The specification does not cover PCTFE parts intended for general use applications, in which control of dimensional
stability, molecular weight, and crystallinity are not as important. For machined PCTFE parts intended for general use, use
Specification D7211.
1.6 This specification classifies parts into three classes based upon intended uses and exposures: oxygen-containing media,
reactive media, and inert media.
1.7 Application—PCTFE components covered by this specification are virgin, 100 % PCTFE resin, free of plasticizers and other
additives. The components are combustion resistant in oxygen, dimensionally stable, and meet other specific physical
characteristics appropriate for their end use. They are used in valves, regulators, and other devices in oxygen, air, helium, nitrogen,
hydrogen, ammonia, and other aerospace media systems. The components typically are used as valve seats, o-rings, seals, and
gaskets. They are removed and replaced during normal maintenance procedures. The components provide reliable sealing surfaces
resulting in proper closure of valves and related devices and no leakage from the system into the environment. They will experience
static mechanical loading, cyclic mechanical loading, temperatures ranging from cryogenic to 71 ºC (160 ºF), 71°C (160°F), and
pressures up to 68.9 MPa (10,000, psig) for oxygen and air media, and 103.4 MPa (15,000 psig) for inert media.
1.8 The values stated in SI units are to be regarded as standard. The values in parentheses are for information only.
1.9 The following precautionary caveat pertains only to the test methods portion, Section 1213, 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 to determine the applicability
of regulatory limitations prior to use.
NOTE 1—There is no known ISO equivalent to this standard.
NOTE 1—There is no known ISO equivalent to this standard.
1.10 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.
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 Oct. 1, 2012Aug. 1, 2019. Published November 2012August 2019. Originally approved in 2005. Last previous edition approved in 20052012
as D5111 - 05.D5111 - 12. DOI: 10.1520/D7194-12.10.1520/D7194-19.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1
---------------------- Page: 1 ----------------------
D7194 − 19
2. Referenced Documents
2
2.1 ASTM Standards:
D618 Practice for Conditioning Plastics for Testing
D638 Test Method for Tensile Properties of Plastics
D792 Test Methods for Density and Specific Grav
...
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: D7194 − 19
Standard Specification for
Aerospace Parts Machined from Polychlorotrifluoroethylene
1
(PCTFE)
This standard is issued under the fixed designation D7194; 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 during normal maintenance procedures. The components pro-
vide reliable sealing surfaces resulting in proper closure of
1.1 This specification is intended to be a means of calling
valves and related devices and no leakage from the system into
out finished machined parts ready for aerospace use. Such parts
the environment. They will experience static mechanical
may also find use in selected commercial applications where
loading, cyclic mechanical loading, temperatures ranging from
there are clear benefits derived from the use of parts with high
cryogenic to 71°C (160°F), and pressures up to 68.9 MPa
molecular weight, good molecular weight retention during
(10,000, psig) for oxygen and air media, and 103.4 MPa
processing, dimensional stability, controlled crystallinity, and
(15,000 psig) for inert media.
tightly controlled engineering tolerances.
1.8 The values stated in SI units are to be regarded as
1.2 This specification establishes requirements for parts
standard. The values in parentheses are for information only.
machined from virgin, unplasticized, 100 % polychlorotrifluo-
1.9 The following precautionary caveat pertains only to the
roethylene (PCTFE) homopolymers.
test methods portion, Section 13, of this specification: This
1.3 This specification does not cover parts machined from
standard does not purport to address all of the safety concerns,
PCTFE copolymers, PCTFE film or tape less than 0.25-mm
if any, associated with its use. It is the responsibility of the user
(0.010-in.) thick, or modified PCTFE (containing pigments or
of this standard to establish appropriate safety, health, and
plasticizers).
environmental practices and determine the applicability of
1.4 This specification does not allow parts containing re-
regulatory limitations prior to use.
cycled material.
NOTE 1—There is no known ISO equivalent to this standard.
1.5 The specification does not cover PCTFE parts intended
1.10 This international standard was developed in accor-
for general use applications, in which control of dimensional
dance with internationally recognized principles on standard-
stability, molecular weight, and crystallinity are not as impor-
ization established in the Decision on Principles for the
tant. For machined PCTFE parts intended for general use, use
Development of International Standards, Guides and Recom-
Specification D7211.
mendations issued by the World Trade Organization Technical
1.6 This specification classifies parts into three classes
Barriers to Trade (TBT) Committee.
based upon intended uses and exposures: oxygen-containing
2. Referenced Documents
media, reactive media, and inert media.
2
2.1 ASTM Standards:
1.7 Application—PCTFE components covered by this speci-
D618 Practice for Conditioning Plastics for Testing
fication are virgin, 100 % PCTFE resin, free of plasticizers and
D638 Test Method for Tensile Properties of Plastics
other additives. The components are combustion resistant in
D792 Test Methods for Density and Specific Gravity (Rela-
oxygen, dimensionally stable, and meet other specific physical
tive Density) of Plastics by Displacement
characteristics appropriate for their end use. They are used in
D883 Terminology Relating to Plastics
valves, regulators, and other devices in oxygen, air, helium,
D1204 Test Method for Linear Dimensional Changes of
nitrogen, hydrogen, ammonia, and other aerospace media
Nonrigid Thermoplastic Sheeting or Film at Elevated
systems. The components typically are used as valve seats,
Temperature
o-rings, seals, and gaskets. They are removed and replaced
D1430 Classification System for Polychlorotrifluoroethylene
(PCTFE) Plastics
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 Aug. 1, 2019. Published August 2019. Originally contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
approved in 2005. Last previous edition approved in 2012 as D7194 - 12. DOI: Standards volume information, refer to the standard’s Document Summary page on
10.1520/D7194-19. the ASTM website.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1
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...
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