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ASTM D7211-05

(Specification)

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

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

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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 D 7194.
1.6 ApplicationPCTFE 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 = 55C [131F].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 D 648 is 126C [259F].
1.7 The values stated in SI units are to be regarded as standard. The values in brackets are for information only.
The following precautionary caveat pertains only to the test methods portion, Section , 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.Note 3
There is no equivalent ISO standard.

General Information

Status
Historical
Publication Date
31-Oct-2005
ICS
83.140.01 - Rubber and plastics products in general
Technical Committee
D20 - Plastics
Drafting Committee
D20.15 - Thermoplastic Materials
Current Stage
Ref Project

Relations

Replaced By
ASTM D7211-06 - Standard Specification for Parts Machined from Polychlorotrifluoroethylene (PCTFE) and Intended for General Use
Effective Date
15-Mar-2006
Referred By
ASTM D7194-19 - Standard Specification for Aerospace Parts Machined from Polychlorotrifluoroethylene (PCTFE)
Effective Date
01-Nov-2005
Referred By
ASTM D1430-22 - Standard Classification System for Polychlorotrifluoroethylene (PCTFE) Plastics
Effective Date
01-Nov-2005

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ASTM D7211-05 - Standard Specification for Parts Machined from Polychlorotrifluoroethylene (PCTFE) and Intended for General UseASTM D7211-05 - Standard Specification for Parts Machined from Polychlorotrifluoroethylene (PCTFE) and Intended for General Use
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ASTM D7211-05 - Standard Specification for Parts Machined from Polychlorotrifluoroethylene (PCTFE) and Intended for General Use
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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: D 7211 – 05
Standard Specification for
Parts Machined from Polychlorotrifluoroethylene (PCTFE)
and Intended for General Use
This standard is issued under the fixed designation D 7211; 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 (e) indicates an editorial change since the last revision or reapproval.
NOTE 2—Although no recommendations are made regarding the limit-
1. Scope
ing upper use temperature of PCTFE, the heat deflection temperature of
1.1 This specification is intended to be a means of calling
PCTFE as determined by Test Method D 648 is 126°C [259°F].
out finished machined parts ready for commercial use.
1.7 The values stated in SI units are to be regarded as
1.2 This specification establishes requirements for parts
standard. The values in brackets are for information only.
machined from unplasticized, 100 % polychlorotrifluoroethyl-
1.8 The following precautionary caveat pertains only to the
ene (PCTFE) homopolymers.
test methods portion, Section 11, 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 and health
plasticizers).
practices and determine the applicability of regulatory limita-
1.4 This specification allows for parts containing regrind
tions prior to use.
and recycled material.
1.5 The specification does not cover PCTFE parts used in
NOTE 3—There is no equivalent ISO standard.
aerospace applications involving storage and handling of
2. Referenced Documents
oxygen media, air media, inert media, and certain reactive
media (specifically ammonia, gaseous hydrogen, and liquid
2.1 ASTM Standards:
hydrogen), in which dimensional stability, high molecular D 621 Test Methods for Deformation of Plastics Under
weight, molecular weight retention, and crystallinity control
Load
are important considerations. For aerospace grade, machined D 648 Test Method for Deflection Temperature of Plastics
PCTFE parts, use Specification D 7194.
Under Flexural Load in the Edgewise Position
1.6 Application—PCTFE parts covered by this specification D 792 TestMethodsforDensityandSpecificGravity(Rela-
are made of 100 % PCTFE resin, free of plasticizers, fillers, or tive Density) of Plastics by Displacement
other additives.The parts meet specific physical characteristics
D 883 Terminology Relating to Plastics
appropriate for their end use, and are typically used in D 1430 Classification System for Polychlorotrifluoroethyl-
applications requiring good electrical properties or resistance
ene (PCTFE) Plastics
to aggressive chemical media. General purpose PCTFE parts D 1600 Terminology for Abbreviated Terms Related to
include seals, gaskets, valve and pump parts (cryogenic and
Plastics
noncryogenic), translucent tubing, sight glasses, flowmeter D2117 Test Methods for Melting Point of Semicrystalline
tubes, heavy-walled solid pipes and fittings, gears, cams,
Polymers by the Hot Stage Microscopy Method
bearings, laboratory ware, circuit boards, electrical connector D 4591 Test Method for Determining Temperature and
covers and switches, radome covers, and a variety of other
Heats of Transitions of Fluoropolymers by Differential
stock shapes. They are removed and replaced during normal Scanning Calorimetry
maintenance procedures. The parts also experience static or
D 7194 Specification for Aerospace Parts Made from Poly-
dynamic mechanical loading, and temperatures ranging from chlorotrifluoroethylene (PCTFE)
cryogenic to temperatures at or above the glass transition
3. Terminology
temperature, T = 55°C [131°F].
g
3.1 Definitions—Terms are defined in accordance with Ter-
NOTE 1—Quick-quenched PCTFE will potentially exhibit dimensional
minologies D 883 and D 1600 unless listed below.
relaxation in the vicinity of T .
g
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
This specification is under the jurisdiction of ASTM Committee D20 on contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
PlasticsandisthedirectresponsibilityofSubcommitteeD20.20onPlasticProducts. Standards volume information, refer to the standard’s Document Summary page on
Current edition approved November 1, 2005. Published November 2005. the ASTM website.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
D7211–05
3.1.1 oxygen media, n—liquid oxygen and gaseous oxygen. 8.1 Finished parts shall have a natural translucent appear-
3.1.2 air media, n—liquid air and pressurized air (including ance. The color shall be white or gray with no yellowing or
breathing air). other unnatural color.
3.1.3 inert media, n—for example, gaseous helium and 8.2 Finished parts shall be free of voids, scratches, fissures,
gaseous nitrogen. inclusions, or entrapped air bubbles that will affect serviceabil-
3.1.4 reactive media, n—for example, ammonia, gaseous ity. No particles (for example, black specks) shall be visible to
hydrogen, and liquid hydrogen, nitrous oxide, and nitrogen the naked eye.
trifluoride. 8.3 Depending on commercial resin grade, processing route
3.1.5 Zero Strength Time (ZST), n—time measured in ac- (for example, extrusion, compression molding, injection mold-
cordance with Section 10 of Classification D 1430 to check the ing), quenching method (water or air cooling), and thickness of
relative molecular weight of the PCTFE material. the starting semifinished article from which the finished part is
made, the specific gravity, sp. gr. 23/23ºC of finished PCTFE
4. Classification parts when determined by 11.1, can vary from 2.11 to 2.17.
However, to ensure consistent properties and performance in
4.1 Part shape and size shall be defined by the applicable
the intended application, the specific gravity of a finished part
purchase order.
shall not be allowed to fluctuate freely within the 2.11 to 2.17
4.2 General purpose grade PCTFE shall be Class 1 ho-
range.
mopolymer in accordance Classification D 1430.
8.4 The melting point of finished parts shall be determined
4.3 The grade of product shall be categorized in accordance
tobeintherangeof210to220ºC[410to428ºF]asdetermined
with Classification D 1430 as follows:
in 11.2.
4.3.1 Grade 0 having an undetermined or unspecified ZST.
8.5 Themaximumallowabledeformationunderloadwillbe
4.3.2 Grade 1 having an as polymerized ZST of 100 to 199
10 % as determined in 11.3.
seconds.
8.6 Finished parts shall be made from semifinished articles
4.3.3 Grade 2 having an as polymerized ZST of 200 to 299
having an as-molded zero strength time (ZST ) of 300 to
seconds. stock
450 s (Grade 3), or 200 to 299 s (Grade 2), or 100 to 199 s
4.3.4 Grade 3 having an as polymerized ZST of 300 to 450
(Grade 1), as determined in 11.4, or shall be undetermined or
seconds.
unspecified (Grade 0).
4.4 The finished part shall be received in an unannealed or
annealed state as specified in the applicable purchase order. If
NOTE 5—To ensure that the process route does not cause excessive
annealed,annealingshallbeaccomplishedasdescribedin11.5. thermal degradation and accompanying molecular weight drop, it is
recommended that the maximum allowable ZST drop, DZST, shall not
exceed <20 % as determined in 11.4.4.
5. Ordering Information
8.7 All finished parts are to be supplied in annealed condi-
5.1 All parts covered by this specification shall be ordered
tion in accordance with 11.5, or in an unannealed condition.
by grade and annealed state as listed in Section 4.
8.8 No dimension of an annealed, finished part shall change
more than 0.003 mm/mm [0.003 in./in.] measured at 23 6 2ºC
6. Materials and Manufacture
[73.4 6 3.6ºF] before and after being held for 48 65hat70
6.1 Annealed and unannealed parts shall be made from
6 5°C [158 6 9°F], as determined in 11.6.
polymers meeting all requirements of Classification D 1430,
8.9 If so specified in the purchase contract or order, the
Group 01, Class 1, Grades 0, 1, 2, or 3.
maximum allowable ZST drop, DZST, shall be <20 % as
6.2 Parts shall be made from virgin, unfilled, unplasticized,
determined in 11.4.4.
100 %polychlorotrifluoroethylene(PCTFE)homopolymerand
up to 30 percent (by volume) regrind or recycled polymer.
9. Number of Tests
6.3 The base material shall be free of all defects or con-
9.1 When the number of test specimens is not stated in the
taminants that would be detrimental to final fabrication or
test
...

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1.4 Test data obtained by this test method are relevant and appropriate for use in engineering design.  
1.5 The values stated in SI units are to be regarded as standard.  
1.6 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 1: There is no known ISO equivalent to this standard.  
1.7 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...

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ASTM
ASTM D2565-23(Practice)
Standard Practice for Xenon-Arc Exposure of Plastics Intended for Outdoor Applications

SIGNIFICANCE AND USE
4.1 The ability of a plastic material to resist deterioration of its electrical, mechanical, and optical properties caused by exposure to light, heat, and water can be very significant for many applications. This practice is intended to induce property changes associated with end-use conditions, including the effects of daylight, moisture, and heat. The exposure used in this practice is not intended to simulate the deterioration caused by localized weather phenomena, such as, atmospheric pollution, biological attack, and saltwater exposure.  
4.2 Caution—Variations in results are possible when operating conditions are varied within the accepted limits of this practice. Therefore, all references to the use of this practice must be accompanied by a report prepared in accordance with Section 9 that describes the specific operating conditions used. Refer to Practice G151 for detailed information on the caveats applicable to use of results obtained in accordance with this practice.
Note 2: Additional information on sources of variability and on strategies for addressing variability in the design, execution, and data analysis of laboratory-accelerated exposure tests is found in Guide G141.  
4.3 Reproducibility of test results between laboratories has been shown to be good when the stability of materials is evaluated in terms of performance ranking compared to other materials or to a control.6,7 Therefore, exposure of a similar material of known performance (a control) at the same time as the test materials is strongly recommended. It is preferable that the number of specimens of the control material be the same as that used for test materials. It is recommended that at least three replicates of each material be exposed to allow for statistical evaluation of results.  
4.4 Test results will depend upon the care that is taken to operate the equipment in accordance with Practice G155. Significant factors include regulation of line voltage, freedom from salts or other d...
SCOPE
1.1 This practice covers specific procedures and test conditions that are applicable for xenon-arc exposure of plastics conducted in accordance with Practices G151 and G155. This practice also covers the preparation of test specimens, the test conditions best suited for plastics, and the evaluation of test results.  
1.2 The values stated in SI units are to be regarded as standard. The values given in parentheses are mathematical conversions to inch-pound units that are provided for information only and are not considered standard.  
1.3 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 1: This practice and ISO 4892-2 address the same subject matter, but differ in technical content.  
1.4 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.

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ASTM
ASTM D6117-23(Test Method)
Standard Test Methods for Mechanical Fasteners in Plastic Lumber and Shapes

SIGNIFICANCE AND USE
6.1 The resistance of plastic lumber and shapes to direct withdrawal of nails, staples, or screws is a measure of its ability to hold or be held to an adjoining object by means of such fasteners. Factors that affect this withdrawal resistance include the physical and mechanical properties of the plastic lumber and shapes; the size, shape, and surface condition of the fasteners; the speed of withdrawal; physical changes to plastic lumber and shapes or fasteners between time of driving and time of withdrawal; orientation of fiber axis; the occurrence and nature of prebored lead holes; and the temperatures during insertion and withdrawal. These factors will be as circumstances dictate, and representative of the normal manufacturing process.  
6.2 By using a standard size and type of nail, staple, or screw, withdrawal resistance of plastic lumber and shapes can be determined. Throughout the method this is referred to as the basic withdrawal test. Similarly, comparative performances of different sizes or types of nail, staple, or screw can be determined by using a standard procedure with a particular plastic lumber and shape, which eliminates the plastic lumber and shapes product as a variable. Since differences in test methods can have considerable influence on results, it is important that a standard procedure be specified and adhered to, if test values are to be related to other test results.
SCOPE
1.1 These test methods cover the evaluation of fastener use with “as manufactured” plastic lumber and shapes through the use of two different testing procedures.  
1.2 The test methods appear in the following order:    
Sections  
Test Method A—Nail, Staple, or Screw Withdrawal Test  
4 to 13  
Test Method B—Nail, Staple, or Screw Lateral Resistance Test  
14 to 22  
1.3 Plastic lumber and plastic shapes are currently made predominately from recycled plastics. However, these test methods would also be applicable to similar manufactured plastic products made from virgin resins where the product is non-homogeneous in the cross-section.  
1.4 The values stated in inch-pound units are to be regarded as standard. The SI units given in parentheses are for information only.  
1.5 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 1: There is no known ISO equivalent to this standard.  
1.6 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.

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ASTM
ASTM D7211-23(Specification)
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 general use.  
1.2 This specification establishes requirements for parts machined from polychlorotrifluoroethylene (PCTFE) semifinished parts.  
1.3 For aerospace grade, machined PCTFE parts, use Specification D7194.
Note 1: Quick-quenched PCTFE will potentially exhibit dimensional relaxation in the vicinity of Tg = 55°C (131°F).
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).  
1.4 The values stated in SI units are to be regarded as standard. The values in parentheses are for information only.  
1.5 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.  
1.6 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.

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ASTM
ASTM D6779-23(Specification)
Standard Classification System for and Basis of Specification for Polyamide Molding and Extrusion Materials (PA)

SCOPE
1.1 This classification system covers polyamide materials suitable for molding and extrusion. Some of these compositions are also suitable for application from solution.  
1.2 The properties included in this classification system are those required to identify the compositions covered. Other requirements necessary to identify particular characteristics important to specialized applications are to be specified by using suffixes as given in Section 5.  
1.3 This classification system and subsequent line callout (specification) are intended to provide a means of calling out plastic materials used in the fabrication of end items or parts. It is not intended for the selection of materials. Material selection can be made by those having expertise in the plastic field after careful consideration of the design and the performance required of the part, the environment to which it will be exposed, the fabrication process to be employed, the costs involved, and the inherent properties of the material other than those covered by this classification system.  
1.4 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.  
1.5 The following precautionary caveat pertains only to the test methods portion, Section 11, of this classification system. 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 1: This classification system is similar to ISO 16396-1/-2,
although the technical content is significantly different.
Note 2: The materials covered by this classification system include a subset of polyamides defined as polyphthalamides (PPA) as in 3.2.1, some of which are also classified in ASTM D5336. Specifically, groups 7, 10, 12, 13, 14, 15 and 17 in this standard are PPA materials. ASTM D5336 gives further details relating to groups 10, 12 and 13.  
1.6 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.

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