ASTM D5675-99a
(Specification)Standard Specification for Fluoropolymer Micropowders
Standard Specification for Fluoropolymer Micropowders
SCOPE
1.1 This specification covers fluoropolymer micro powders that are used as additives to other materials in order to improve lubricity or to control other characteristics of the base material. Recycled fluoropolymer materials meeting the detailed requirements of this specification are included (see Guide D5033). These powders are sometimes known as lubricant powders. The powders usually have a much smaller particle size than those used for molding or extrusion, and they generally are not processed alone. The test methods and properties included are those required to identify and specify the various types of fluoropolymer micro powders.
1.2 These powders are designated as filler powders (F) in ISO 12086-1 and ISO 12086-2.
1.3 The values stated in SI units as detailed in Practice E380 are to be regarded as the standard, and the practices of Practice E380 incorporated herein.
1.4 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. Specific precautionary statements are given in Note 1.
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Standards Content (Sample)
NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
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Designation: D 5675 – 99a
Standard Classification for
Fluoropolymer Micropowders
This standard is issued under the fixed designation D 5675; 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.
1. Scope * D 1600 Terminology for Abbreviated Terms Relating to
Plastics
1.1 This classification system provides a method of ad-
D 3892 Practice for Packaging/Packing of Plastics
equately identifying PTFE micropowders using a system
D 4000 Classification System for Specifying Plastic Mate-
consistent with that of Classification System D 4000. It further
rials
provides a means for specifying these materials by the use of
D 4464 Test Method for Particle Size Distribution of Cata-
a simple line callout designation. This classification covers
lytic Material by Laser Light Scattering
fluoropolymer micropowders that are used as lubricants and as
D 4567 Test Method for the Single-Point Determination of
additives to other materials in order to improve lubricity or to
the Specific Surface Area of Catalysts Using Nitrogen
control other characteristics of the base material.
Adsorption by Continuous Flow Method
1.2 These powders are sometimes known as lubricant pow-
D 4591 Test Method for Determining Temperatures and
ders. The powders usually have a much smaller particle size
Heats of Transitions of Fluoropolymers by Differential
than those used for molding or extrusion, and they generally
Scanning Calorimetry
are not processed alone. The test methods and properties
D 4895 Specification for Polytetrafluoroethylene (PTFE)
included are those required to identify and specify the various
Resins Produced from Dispersion
types of fluoropolymer micropowders. Recycled fluoropolymer
D 5033 Guide for the Development of Standards Relating to
materials meeting the detailed requirements of this classifica-
the Proper Use of Recycled Plastics
tion are included (see Guide D 5033).
D 5740 Guide for Writing Material Standards in the D 4000
1.3 These micropowders and the materials designated as
Format
filler powders (F) in ISO 12086-1 and ISO 12086-2 are
IEEE/ASTM SI 10 Standard for Use of the International
equivalent.
System of Units (SI): The Modern Metric System
1.4 The values stated in SI units as detailed in IEEE/ASTM
2.2 ISO Standards:
SI 10 are to be regarded as the standard.
ISO 12086-1 Plastics-Fluoropolymer Dispersions and
1.5 This standard does not purport to address all of the
Moulding and Extrusion Materials Part 1: Designation and
safety concerns, if any, associated with its use. It is the
System and Basis for Specification
responsibility of the user of this standard to establish appro-
ISO 12086-2 Plastics-Fluoropolymer Dispersions and
priate safety and health practices and determine the applica-
Moulding and Extrusion Materials Part 2: Preparation of
bility of regulatory limitations prior to use. Specific precau-
Test Specimens and Determination of Properties
tionary statements are given in 7.1.2.
3. Terminology
2. Referenced Documents
3.1 Definitions—The terminology given in Terminology
2.1 ASTM Standards:
3 D 883 is applicable to this classification unless otherwise
D 854 Test Method for Specific Gravity of Soils
specified.
D 883 Terminology Relating to Plastics
3.1.1 bulk density, n—the mass per unit volume, in grams
D 1238 Test Method for Flow Rates of Thermoplastics by
per litre of a loosely packed material, such as a molding
Extrusion Plastometer
powder. D 4895
3.1.2 lot, n—one production run or uniform blend of two or
more production runs. D 4895
This classification is under the jurisdiction of ASTM Committee D-20 on
Plastics and is the direct responsibility of Subcommittee D20.15 on Thermoplastic
Materials.
Current edition approved Dec. 10, 1999. Published March 2000. Originally Annual Book of ASTM Standards, Vol 08.02.
published as D 5675 – 95. Last previous edition D 5675 – 99. Annual Book of ASTM Standards, Vol 05.03.
2 7
Designations, specifications, and test methods are included in ISO 12086-1 and Annual Book of ASTM Standards, Vol 08.03.
12086-2. Annual Book of ASTM Standards, Vol 14.02.
3 9
Annual Book of ASTM Standards, Vol 04.08. Available from American National Standards Institute, 11 W. 42nd St., 13th
Annual Book of ASTM Standards, Vol 08.01. 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.
D 5675
NOTE 1—An example of this classification system is as follows:
3.2 Definitions of Terms Specific to This Standard:
The designation ASTM D 5675 PTFE0111 indicates PTFE micropowder
3.2.1 direct polymerization powder, n—PTFE material
in accordance with Specification D 5675:
based on polymerizations designed to produce low molecular
01 = PTFE resin,
weight PTFE resins with properties of materials described in
1 = suspension polymerization based, and
this standard.
1 = formerly Type I, Grade 1, Class A, in
3.2.2 dispersion-based powder, n—PTFE material based on
Specification D 5675 - 95a
the type of polymerization normally related to the production with a particle size of 1 to <10 μm
(average diameter), a surface area of
of “paste or coagulated dispersion type” PTFE resins.
0.8 to 4.5 m /g, and a
3.2.3 micropowder, n—white, free-flowing PTFE powders
mass flow rate of >1 g/10 min using a load of 5 kg.
designed for use as additives in other materials or systems.
3.2.4 reground PTFE, n—PTFE material produced by
5. General Requirements
grinding polytetrafluoroethylene (PTFE) material that has been
5.1 The resin shall be uniform and shall contain no additives
preformed but has never been sintered.
or foreign material.
3.2.5 reprocessed PTFE, n—PTFE material produced by
5.2 The color of the material as shipped by the seller shall
grinding PTFE material that has been both preformed and
be white to gray.
sintered.
3.2.6 sintering, n—as it applies to PTFE, a thermal treat-
6. Sampling
ment during which the PTFE is melted and recrystallized by
6.1 Sampling shall be statistically adequate to satisfy the
cooling, with coalescence occurring during the treatment.
requirements of 9.4.
3.2.7 suspension-based powder, n—PTFE material based
on the type of polymerization normally related to the produc- 7. Sample Preparation
tion of granular PTFE resins.
7.1 Test Samples:
3.3 Abbreviations:Abbreviations—Abbreviated terms are in
7.1.1 For each lot of fluoropolymer micropowder, collect a
accordance with Terminology D 1600.
suitable sample for testing. The sample powder should be at the
standard laboratory temperature of 23 6 2°C (73.4 6 3.6°F)
4. Classification
prior to testing.
4.1 This classification covers two groups of fluoropolymer 7.1.2 Screen the powder through a No. 10 hand sieve in
micropowders. Fluoropolymer micropowders are classified
order to break up or remove any lumps. (Warning—
into groups according to their base fluoropolymer. These Fluoropolymers may evolve small quantities of gaseous prod-
groups are further subdivided into classes and grades as shown
ucts when heated above 200°C (400°F). Some of these gases
in Table 1. may be harmful. Exhaust ventilation must consequently be
TABLE 1 Basic Properties
Particle Size,
A
Surface Area, Melt-Flow Rate,
B
Group Description Class Description Grade Description Average Mass
m /g g/10 min
Diameter, μm
C D
01 PTFE 1 suspension based 1 1 to <10 0.8 to 4.5 >1 5
E
2 10 to 25 0.8 to 4.5 >0.1 10
F
2 dispersion based 1 1 to <10 4.6 to 15 >1 5
G
2 10 to 30 4.6 to 15 >0.1 10
H
3 25 to 50 4.6 to 15 >1 5
I
4 50 to 150 4.6 to 15 >1 5
J
3 direct polymerization 1 2 to 15 4.6 to 15 >1 5
K
4 reground suspension 1 1 to <10 0.8 to 4.5 >1 5
L
5 reground dispersion 1 1 to 25 0.8 to 4.5 >1 5
M
6 previously sintered 1 10 to 50 <1.5 >20 5
N O
02 FEP 1 1 10 to 30 4.6 to 15 4 to 12 5
A
Orifice diameter of 2.0955 mm and temperature of 372°C.
B
Kilogram load on plastometer.
C 3
Group 01 materials have a specific gravity of 2.10 to 2.30 g/cm , a water content (maximum) of <0.1 %, a melting point (peak temperature) of 315 to 340°C, and a
bulk density of 225 to 600 g/L.
D
Formerly Specification D 5675–95a, Type I, Grade 1, Class A.
E
Formerly Specification D 5675–95a, Type I, Grade 1, Class B.
F
Formerly Specification D 5675–95a, Type I
...
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