ASTM D1430-00
(Classification)Standard Classification System for Polychlorotrifluoroethylene (PCTFE) Plastics
Standard Classification System for Polychlorotrifluoroethylene (PCTFE) Plastics
SCOPE
1.1 This classification system covers polychlorotrifluoroethylene (PCTFE) plastics that consist of at least 90 % chlorotrifluoroethylene and are suitable for extrusion and for compression and injection molding. The remaining 10 % may include chemical modifications, such as co-monomers, but not colorants, fillers, plasticizers, or mechanical blends with other resins. This classification system does not cover recycled PCTFE materials.
1.2 The physical and electrical properties of parts molded or extruded from PCTFE molding compounds vary with the crystalline content obtained during processing and subsequent annealing. Accordingly, the numerical values listed in apply only to the test specimens molded in accordance with Section 8. These values may not be applicable as design criteria to parts prepared and annealed under other conditions.
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 precautionary statement pertains only to the test methods portion, Section 10, 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 and health practices and determine the applicability of regulatory limitations prior to use.
Note 1--Although this classification system and ISO 12086-1 (1995) and ISO 12086-2 (1995) differ in approach or detail, data obtained using either are technically equivalent.
General Information
Relations
Standards Content (Sample)
NOTICE: This standard has either been superceded and replaced by a new version or discontinued.
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Designation: D 1430 – 00
Standard Classification System for
Polychlorotrifluoroethylene (PCTFE) Plastics
This standard is issued under the fixed designation D 1430; 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.
This standard has been approved for use by agencies of the Department of Defense.
1. Scope * Insulating Materials for Testing
D 621 Test Methods for Deformation of Plastics Under
1.1 This classification system covers polychlorotrifluoroet-
Load
hylene (PCTFE) plastics that consist of at least 90 % chlorot-
D 792 Test Methods for Density and Specific Gravity (Rela-
rifluoroethylene and are suitable for extrusion and for com-
tive Density) of Plastics by Displacement
pression and injection molding. The remaining 10 % may
D 883 Terminology Relating to Plastics
include chemical modifications, such as co-monomers, but not
D 1600 Terminology for Abbreviated Terms Relating to
colorants, fillers, plasticizers, or mechanical blends with other
Plastics
resins. This classification system does not cover recycled
D 2117 Test Method for Melting Point of Semicrystalline
PCTFE materials.
Polymers by the Hot Stage Microscopy Method
1.2 The physical and electrical properties of parts molded or
D 3418 Test Method for Transition Temperatures of Poly-
extruded from PCTFE molding compounds vary with the
mers by Thermal Analysis
crystalline content obtained during processing and subsequent
D 3892 Practice for Packaging/Packing of Plastics
annealing. Accordingly, the numerical values listed in Table 1
D 4591 Test Method for Determining Temperatures and
apply only to the test specimens molded in accordance with
Heats of Transitions of Fluoropolymers by Differential
Section 8. These values may not be applicable as design criteria
Scanning Calorimetry
to parts prepared and annealed under other conditions.
2.2 ISO Standard:
1.3 The values stated in SI units as detailed in IEEE/ASTM
ISO 12086-1 (1995) Plastics—Fluoropolymer Dispersions
SI 10 are to be regarded as the standard. The values given in
and Moulding and Extrusion Materials, Part 1
parentheses are for information only.
ISO 12086-2 (1995) Plastics—Fluoropolymer Dispersions
1.4 The following precautionary statement pertains only to
and Moulding and Extrusion Materials, Part 2
the test methods portion, Section 10, of this classification
system: This standard does not purport to address all of the
3. Terminology
safety concerns, if any, associated with its use. It is the
3.1 Definitions—Definitions of terms used in this classifi-
responsibility of the user of this standard to establish appro-
cation system shall be in accordance with Terminology D 883.
priate safety and health practices and determine the applica-
3.1.1 lot, n—one production run or uniform blend of two or
bility of regulatory limitations prior to use.
more production runs. D 4895
NOTE 1—Although this classification system and ISO 12086-1 (1995)
3.2 Definitions of Terms Specific to This Standard:
and ISO 12086-2 (1995) differ in approach or detail, data obtained using
3.2.1 preforming, n—a process to compress the material
either are technically equivalent.
under pressure in a mold to form a preform.
3.2.2 zero strength time (ZST ), n—time measured according
2. Referenced Documents
to Section 10 of this classification system to check the relative
2.1 ASTM Standards:
molecular weight of PCTFE material.
D 150 Test Methods for A-C Loss Characteristics and
3.3 Abbreviations:Abbreviations—Abbreviated terms are in
Permittivity (Dielectric Constant) of Solid Electrical Insu-
accordance with Terminology D 1600.
lating
D 618 Practice for Conditioning Plastics and Electrical
Annual Book of ASTM Standards, Vol 08.01.
1 These test methods were withdrawn with no replacement in 1994. Test Methods
This classification system is under the jurisdiction of ASTM Committee D20 on
D 621 can be obtained from Global Engineering Documents, 15 Inverness Way
Plastics and is the direct responsibility of Subcommittee D20.15 on Thermoplastic
East, Englewood, CO 80112.
Materials (Section D20.15.12).
Discontinued; see 1993 Annual Book of ASTM Standards, Vol 08.01.
Current edition approved Nov. 10, 2000. Published January 2001. Originally
Annual Book of ASTM Standards, Vol 08.02.
published as D 1430 – 56 T. Last previous edition D 1430 – 95.
Annual Book of ASTM Standards, Vol 08.03.
Annual Book of ASTM Standards, Vol 10.01.
Available from American National Standards Institute, 11 W. 42nd St., 13th
Floor, New York, NY 10036.
*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.
NOTICE: This standard has either been superceded and replaced by a new version or discontinued.
Contact ASTM International (www.astm.org) for the latest information.
D 1430
TABLE 1 Requirements for PCTFE Molded Test Specimens
Properties
Specific Zero Deformation Melting F G
Dielectric Constant , max Dissipation Factor , max
A
Group Class Description Grade Gravity, Strength Under Point,
B C,D E
Khz MHz KHz MHz
23/23°C Time, s Load °C
01 1 homopolymer 1 2.10-2.12 100-199 10 210-220 2.70 2.50 0.030 0.012
powder 2 2.10-2.12 200-299 10 210-220 2.70 2.50 0.030 0.012
3 2.10-2.12 300-450 10 210-220 2.70 2.50 0.030 0.012
02 2 modified
pellet homopolymer 1 2.10-2.12 100-199 15 200-210 2.70 2.50 0.030 0.012
2 2.10-2.12 200-299 15 200-210 2.70 2.50 0.030 0.012
3 copolymer 1 2.08-2.10 100-199 20 190-200 2.70 2.50 0.035 0.015
2 2.07-2.10 200-299 25 190-200 2.70 2.50 0.035 0.015
00 0 other
Other
A
See 10.1.7.
B
See 10.1.3.
C
See 10.1.4.
D
Maximum at 1112 N (250 lbf), 24 h, 70°C, %.
E
See 10.1.5.
F
See 10.1.6.
G
See 10.1.6.
4. Classification sheets 1.58 6 0.08 mm (0.062 6 0.003 in.) thick, prepared
from the resins in the following manner:
4.1 The PCTFE materials are classified into groups in
accordance with their physical appearance. The groups are 9.1.1 Preforming—Powder resin shall be preformed prior to
molding in the following way: Place 30 6 0.5 g of resin into
further subdivided into classes based on chemical composition.
These classes are subdivided into grades as shown in the Basic a 57-mm (2.25-in.) diameter positive-pressure compression
Property Table (Table 1). An example of this classification mold and compress the material at room temperature into a
system is given as follows:
preform having a density of 1.4 to 1.5 g/cm . A pressure of 68.9
01 = powder
MPa (10 000 psi) will satisfactorily accomplish the densifica-
1 = homopolymer
tion.
2 = having properties in accordance with Table 1 (Grade 2)
9.1.2 Molding—Pelletized resin, granular resin, and pre-
4.1.1 To facilitate incorporation of future material the
forms of powder resin shall be molded in the following way:
“other” category for group (00), class (0), and grade (0) are
Place the preform prepared in accordance with 9.1.1 or 30 6
shown in Table 1.
0.5 g of pelletized or granular resin on a 0.63-mm (0.025-in.)
thick chrome-plated metal plate and cover with a similar plate.
5. General Requirements
Place spacers, 1.91 6 0.03 mm (0.075 6 0.001 in.) thick,
5.1 The molding or extrusion material shall be of uniform
between the chrome-plated metal plates and far enough apart
composition and so compounded as to conform to the require-
so that they do not interfere with the flow of the resin during
ments of this classification system.
molding. Place the plates, with spacers and resin in place,
6. Detail Requirements between the platens of the press, the platens having been
heated to a surface temperature of 265 6 5°C. Close and
6.1 Test specimens prepared in accordance with Section 9
continuously load the platens, following the rate of melting so
shall conform to the requirements prescribed for the particular
that the plates reach the stops within 3 min after closing the
type and grade in Table 1.
press. Then apply sufficient pressure for 3 min more to mold a
7. Sampling
sheet of the required thickness. Immediately after completion
7.1 Sampling shall be statistically adequate to satisfy the of the pressing, relieve the load, remove the plates and plastic
requirements of 11.4.
sheet together, and at once quench them in cold water (15 6
5°C) for 5 min, supporting the sandwich in a vertical position
8. Number of Tests
in the water. Then strip the 1.58 6 0.08-mm (0.062 6
8.1 One set of test specimens as prescribed in Section 9
0.003-in.) thick sheet from the metal plates. This sheet will be
shall be considered sufficient for testing each batch. The 2
approximately 75 cm . Cut specimens from the center section
average result for the specimens tested shall conform to the
of each sheet, discarding any imperfectly molded edges.
requirements prescribed in this classification system.
10. Test Methods
9. Specimen Preparation
9.1 Test specimens shall be cut from compression-molded 10.1 The properties enumerated in this classification system
NOTICE: This standard has either been superceded and replaced by a new version or discontinued.
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D 1430
shall be determined in accordance with the following test or differential scanning calorimetry (DSC) (see Test Method
methods: D 4591). Both test methods give equivalent melting points
10.1.1 Conditioning—For those tests where conditioning is after each sample receives a similar cooling history from the
melt. Since rapid cooling may give a poor birefringence signal
required, the molded test specimens shall be conditioned in
accordance with Procedure A of Practice D 618. (see Note 3, Test Method D 2117) and a broad, poorly defined
melt temperature, a sufficiently slow cooling rate should be
10.1.2 Test Conditions—Tests shall be conducted in the
selected to give a sharp, well-defined melt temperature on
standard laboratory atmosphere of 23 6 2°C (73.46 3.6°F)
reheating.
and 50 6 5 % relative humidity unless otherwise specified in
the test methods or in this classification system. 10.1.5.1 For optical microscopy (see Test Method D 2117),
10.1.3 Zero Strength Time (ZST)—The zero strength time
the sample shall be a portion of the compression-molded sheet
of PCTFE plastics shall be determined in accordance with the prepared in accordance with the sampling section which has
procedure described in the following paragraphs:
been remolded to a film 0.01 to 0.04 mm (0.4 to 1.6 mils) thick
10.1.3.1 Significance and Use—Control of molecular between the chrome-plated metal plates in a press with platens
weight of these polymers is necessary because the fabricating heated to a surface temperature of 265 6 5°C.
temperatures are very high and close to the point of rapid
10.1.5.2 For DSC measurements, the test procedure shall
thermal degradation. The test for zero strength time is well
follow that of the procedure section of Test Method D 4591,
suited to this type of control, as it is rapid, simple, and
with the exception that the reported melt temperature is that
adaptable to semiautomatic operation, and for specific PCTFE
obtained upon reheating the sample after an initial melting and
resins correlates with molecular weight.
recrystallization. Since rapid cooling may give a broad, poorly
10.1.3.2 Apparatus—Cylindrical brass thermostat and ac-
defined melt temperature, a sufficiently slow cooling rate
cessory equipment as specified in Annex A1.
should be selected to give a sharp, well-defined temperature on
10.1.3.3 Test Strip—From the molded sheet prepared in
reheating.
accordance with Section 9 cut two strips 50 mm (2 in.) long,
10.1.6 Dissipation Factor and Dielectric Constant—Test
4.8 mm ( ⁄16 in.) wide, and 1.58 6 0.08 mm (0.062 6 0.003 in.)
Methods D 150.
thick, using the sample cutter. With the notching punch make
NOTE 3—A disk of approximately 50-mm (2-in.) diameter has been
a V-notch in both sides of the strips approximately at the center
found satisfactory for the test.
line (equally distant from the ends of the 50-mm length) so that
the notches are directly opposite each other. The cross-
10.1.7 Specific Gravity—Test Method A of Test Methods
sectional width between the notches shall be 1.19 6 0.03 mm
D 792. The liquid used shall be n-heptane. The average of the
(0.047 6 0.001 in.), and the sides of each notch shall form an
specific·gravity of three test specimens shall be reported.
angle of 90 6 0.5° with each other. Alternatively, cut and notch
the test strips in one operation with a test specimen punch
11. Inspection and Certification
mounted in an arbor press. Dimensions of the finished test strip
11.1 Inspection and certification of the material supplied
are shown in Fig. A1.1.
with reference to a specification based on this classification
10.1.3.4 Procedure—Insert one end of each notched strip
system shall be for conformance to the requirements specified
into a specimen holder (Fig. A1.1) and clip a weight of 7.5 6
herein.
0.1 g on the other end of the strip. The specimen holder and
11.2 Lot-acceptance shall be the basis on which acceptance
weight shall be at or near room temperature (23 6 10°C).
or rejection of the lot is made. The lot-acceptance inspection
Insert the weighted specimens into the furnaces, which shall be
shall consist of particle size determination.
at a temperature of 250 6 1°C, and start the timers at the
11.3 Periodic check inspection with reference to a specifi-
moment of insertion. As each specimen breaks and the attached
cation based on this classification system shall consist of the
weight drops through the bottom of the furnace, stop the
tests for all requirements of the material under the specifica-
corresponding timer. Record the time in seconds indicated on
tion. Inspection frequency shall be adequate to ensure the
each timer. Take the average of these two readings as the zero
material is certifiable in accordance with 11.4.
strength time for the duplicate specimens. If the difference
between the two measurements exceeds 10 % of the average, 11.4 Certification shall be that the material was manufac-
reject these readings and test a second pair of specimens. tured by a process in statistical control, sampled, tested, and
10.1.3.5 Precision and Bias—The precision and bias data inspected in accordance with this classification system, and
for this test method is to be determined. that the average values for the lot meet the requirements of the
specification (line callout).
10.1.4 Deformation Under Load—Test Method A of Test
Methods D 621. With 1112-N (250-
...
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