ASTM D7471-09
(Specification)Standard Specification for CPT-Fluoropolymer Molding and Extrusion Materials
Standard Specification for CPT-Fluoropolymer Molding and Extrusion Materials
ABSTRACT
This specification addresses the physical properties of copolymers of chlorotrifluoroethylene, perfluoroalkoxy, and tetrafluoroethylene that are suitable for extrusion, compression, and injection molding. It does not cover blended and recycled materials. Covered here is one type of fluoropolymer that is supplied in pellet form and classified according to their melting points, while the resins of each type are divided into four grades according to their melt flow rates. The materials shall be sampled in accordance with an adequate statistical sampling procedure and shall conform to specific gravity, melting point, flow rate, elongation, and tensile strength requirements when tested by the procedures itemized herein.
SCOPE
1.1 This specification covers copolymers of chlorotrifluoroethylene, perfluoroalkoxy, and tetrafluoroethylene and are suitable for extrusion, compression, and injection molding.
1.2 This specification does not cover blended materials and does not cover recycled materials.
1.3 The values stated in SI units as detailed in IEEE/ASTM SI-10 are to be regarded as the standard. The values given in parentheses are for information only.
1.4 The following safety hazards caveat pertains only to the test method 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 and health practices and determine the applicability of regulatory limitations prior to use.
Note 1—There is no known ISO equivalent to this standard.
General Information
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Designation:D7471 −09
StandardSpecification for
CPT-Fluoropolymer Molding and Extrusion Materials
This standard is issued under the fixed designation D7471; 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 E177 Practice for Use of the Terms Precision and Bias in
ASTM Test Methods
1.1 This specification covers copolymers of
IEEE/ASTM SI-10 Use of the International System of Units
chlorotrifluoroethylene, perfluoroalkoxy, and tetrafluoroethyl-
(SI): The Modem Metric System
ene and are suitable for extrusion, compression, and injection
molding.
3. Terminology
1.2 This specification does not cover blended materials and
3.1 General—The terminology given in Terminology D883
does not cover recycled materials.
is applicable to this specification.
1.3 The values stated in SI units as detailed in IEEE/ASTM
3.2 Definitions:
SI-10 are to be regarded as the standard. The values given in
3.3 lot, n—one production run or a uniform blend of two or
parentheses are for information only.
more production runs.
1.4 The following safety hazards caveat pertains only to the
3.4 General—The abbreviated terms given in Terminology
test method portion, Section 11, of this specification.This
D1600 are applicable to this specification.
standard does not purport to address all of the safety concerns,
if any, associated with its use. It is the responsibility of the user
4. Classification
of this standard to establish appropriate safety and health
practices and determine the applicability of regulatory limita- 4.1 This specification covers one type of fluoropolymer
supplied in pellet form classified according to their melting
tions prior to use.
point. The resins of each type are divided into four grades
NOTE 1—There is no known ISO equivalent to this standard.
according to their melt flow rate.
2. Referenced Documents
4.2 An one-line system shall be used to specify materials
covered by this specification. The system uses predefined cells
2.1 ASTM Standards:
D618 Practice for Conditioning Plastics for Testing to refer to specific aspects of this specification, as illustrated as
follows:
D638 Test Method for Tensile Properties of Plastics
D792 Test Methods for Density and Specific Gravity (Rela-
Specification ___________________________
Standard Number : Type : Grade : Special
tive Density) of Plastics by Displacement
Block : : : Notes
D883 Terminology Relating to Plastics
:: :,:
D1238 Test Method for Melt Flow Rates of Thermoplastics
Example: Specification D7471 - 09, I2
by Extrusion Plastometer
For this example, the line callout shall be, Specification
D1600 Terminology forAbbreviatedTerms Relating to Plas-
D7471 – 09, I2 and shall specify a fluoropolymer that has all of
tics
the properties listed for that type and grade in the appropriate
D3418 Test Method for Transition Temperatures and En-
specified properties, or tables, or both, in the specification
thalpies of Fusion and Crystallization of Polymers by
identified. A comma is used as the separator between the
Differential Scanning Calorimetry
standard number and the type. Separators are not needed
D3892 Practice for Packaging/Packing of Plastics
between the group and grade.
1 5. General Requirements
This specification is under the jurisdiction of ASTM Committee D20 on
Plastics and is the direct responsibility of Subcommittee D20.15 on Thermoplastic
5.1 The material shall be of uniform composition and so
Materials.
prepared as to conform to the requirements of this specifica-
Current edition approved June 1, 2009. Published June 2009. DOI: 10.1520/
D7471-09. tion.
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. See the ASTM Form and Style Manual, available from ASTM Headquarters.
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D7471−09
5.2 The material described in this specification shall be free apply 2 to 4 MPa (290 to 580 psi) and hold for 1 to 1.5 min.
of foreign matter to such a contamination level as shall be Maintain the press at 320 6 5°C (608 6 9°F) during these
agreed upon between the purchaser and the seller. steps. Remove the assembly from the press and place between
two 20 6 7-mm (0.75 6 0.25-in.) steel plates whose tempera-
6. Performance Requirements
ture is less than 40°C (104°F).
6.1 The average test result of the lot shall conform to the
8.4 Whenthesheetiscoolenoughtotouchabout50to60°C
requirements prescribed in Table 1 when tested by the proce-
(122 to 140°F)), remove aluminum foil from the sheet. (If the
dures specified herein. Table 1 lists those tests of specific
sheetisallowedtocooltoroomtemperature,thealuminumfoil
gravity and tensile properties requiring a specimen molded as
cannot be pulled free.)
described in Section 8.
9. Conditioning
7. Sampling
9.1 For tests of specific gravity and tensile properties,
7.1 The materials shall be sampled in accordance with an
condition the molded test specimens in accordance with
adequate statistical sampling program.
Procedure A of Practice D618 for a period of at least 4 h prior
to test. The other tests require no conditioning.
8. Specimen Preparation
9.2 Conduct tests at the standard laboratory temperature of
8.1 Prepare a molded sheet 1.5 6 0.3 mm (0.06 6 0.01 in.)
23 6 2°C (73.4 6 3.6°F) for determination of specific gravity
thick. Use a picture-frame-type chase having a suitable
and tensile properties only. Since this resin does not absorb
blanked-out section and thickness to produce the desired sheet.
water, the maintenance of constant humidity during testing is
Use clean aluminum foil, 0.13 to 0.18 mm (0.005 to 0.007 in.)
not necessary. Conduct tests for melt flow rate and melting
thick, in contact with the resin. Spraying a high-temperature
point under ordinary laboratory conditions.
mold release agent on the aluminum foil will help prevent the
foil from sticking to the sheet. Use steel molding plates at least
10. Packaging and Package Marking
1.0mm(0.040in.)thickandhaveanareaadequatetocoverthe
10.1 Packaging—The material shall be packaged in stan-
chase.
dard commercial containers so constructed as to ensure accep-
8.2 Lay down and smoothly cover one plate with a sheet of
tance by common or other carriers for safe transportation to the
aluminum foil. Place the mold chase on top of this assembly.
point of delivery unless otherwise specified in the contract or
Place within the mold chase sufficient molding material to
order.
produce the required sheet in such manner that the polymer
...
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