ASTM D5675-13(2023)
(Classification)Standard Classification for Low Molecular Weight PTFE and FEP Micronized Powders
Standard Classification for Low Molecular Weight PTFE and FEP Micronized Powders
ABSTRACT
This classification system provides a method of adequately identifying PTFE micropowders using a system consistent with that also of another specific classification. These powders are sometimes known as lubricant powders which usually have a much smaller particle size than those used for molding or extrusion. The test methods and properties included are those required to identify and specify the various types of fluoropolymer micropowders. This classification covers two groups of fluoropolymer micropowders. Fluoropolymer micropowders are classified into groups according to their base fluoropolymer. These groups are further subdivided into classes and grades. Different tests shall be performed in order to determine the following properties of the micropowders: melting characteristics, melt flow rate, specific gravity, water content, particle size, surface area, and bulk density.
SCOPE
1.1 This classification system provides a method of adequately identifying low molecular weight polytetrafluoroethylene (PTFE) and fluorinated ethylene propylene (FEP) micronized powders using a system consistent with that of Classification System D4000. It further provides a means for specifying these materials by the use of a simple line callout designation. This classification covers fluoropolymer micronized powders that are used as lubricants and as additives to other materials in order to improve lubricity or to control other characteristics of the base material.
1.2 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 micronized powders. Recycled fluoropolymer materials meeting the detailed requirements of this classification are included (see Guide D7209).
1.3 These fluoropolymer micronized powders and the materials designated as filler powders (F) in ISO 12086-1 and ISO 12086-2 are equivalent.2
1.4 The values stated in SI units as detailed in IEEE/ASTM SI-10 are to be regarded as the standard.
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. Specific precautionary statements are given in 7.1.2.
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.
General Information
Relations
Standards Content (Sample)
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: D5675 − 13 (Reapproved 2023)
Standard Classification for
Low Molecular Weight PTFE and FEP Micronized Powders
This standard is issued under the fixed designation D5675; 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 mendations issued by the World Trade Organization Technical
Barriers to Trade (TBT) Committee.
1.1 This classification system provides a method of ad-
equately identifying low molecular weight polytetrafluoroeth-
2. Referenced Documents
ylene (PTFE) and fluorinated ethylene propylene (FEP) mi-
2.1 ASTM Standards:
cronized powders using a system consistent with that of
D854 Test Methods for Specific Gravity of Soil Solids by
Classification System D4000. It further provides a means for
Water Pycnometer (Withdrawn 2023)
specifying these materials by the use of a simple line callout
D883 Terminology Relating to Plastics
designation. This classification covers fluoropolymer micron-
D1238 Test Method for Melt Flow Rates of Thermoplastics
ized powders that are used as lubricants and as additives to
by Extrusion Plastometer
other materials in order to improve lubricity or to control other
D1600 Terminology for Abbreviated Terms Relating to Plas-
characteristics of the base material.
tics
1.2 These powders are sometimes known as lubricant pow-
D3892 Practice for Packaging/Packing of Plastics
ders. The powders usually have a much smaller particle size
D4000 Classification System for Specifying Plastic Materi-
than those used for molding or extrusion, and they generally
als
are not processed alone. The test methods and properties
D4464 Test Method for Particle Size Distribution of Cata-
included are those required to identify and specify the various
lytic Materials by Laser Light Scattering
types of fluoropolymer micronized powders. Recycled fluo-
D4567 Test Method for Single-Point Determination of Spe-
ropolymer materials meeting the detailed requirements of this
cific Surface Area of Catalysts and Catalyst Carriers Using
classification are included (see Guide D7209).
Nitrogen Adsorption by Continuous Flow Method
1.3 These fluoropolymer micronized powders and the ma-
D4591 Test Method for Determining Temperatures and
terials designated as filler powders (F) in ISO 12086-1 and
Heats of Transitions of Fluoropolymers by Differential
ISO 12086-2 are equivalent.
Scanning Calorimetry
D4895 Specification for Polytetrafluoroethylene (PTFE)
1.4 The values stated in SI units as detailed in IEEE/ASTM
Resin Produced From Dispersion
SI-10 are to be regarded as the standard.
D5740 Guide for Writing Material Standards in the Classi-
1.5 This standard does not purport to address all of the
fication D4000 Format
safety concerns, if any, associated with its use. It is the
D7209 Guide for Waste Reduction, Resource Recovery, and
responsibility of the user of this standard to establish appro-
Use of Recycled Polymeric Materials and Products (With-
priate safety, health, and environmental practices and deter-
drawn 2015)
mine the applicability of regulatory limitations prior to use.
IEEE/ASTM SI-10 Standard for Use of the International
Specific precautionary statements are given in 7.1.2.
System of Units (SI): The Modern Metric System
1.6 This international standard was developed in accor-
2.2 ISO Standards:
dance with internationally recognized principles on standard-
ISO 12086-1 Plastics-Fluoropolymer Dispersions and
ization established in the Decision on Principles for the
Moulding and Extrusion Materials Part 1: Designation and
Development of International Standards, Guides and Recom-
System and Basis for Specification
1 3
This classification is under the jurisdiction of ASTM Committee D20 on For referenced ASTM standards, visit the ASTM website, www.astm.org, or
Plastics and is the direct responsibility of Subcommittee D20.15 on Thermoplastic contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
Materials. Standards volume information, refer to the standard’s Document Summary page on
Current edition approved Nov. 1, 2023. Published November 2023. Originally the ASTM website.
approved 1995. Last previous edition approved 2018 as D5675 - 13 (2018). DOI: The last approved version of this historical standard is referenced on
10.1520/D5675-13R23. www.astm.org.
2 5
Designations, specifications, and test methods are included in ISO 12086-1 and Available from American National Standards Institute (ANSI), 25 W. 43rd St.,
12086-2. 4th Floor, New York, NY 10036, http://www.ansi.org.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
D5675 − 13 (2023)
ISO 12086-2 Plastics-Fluoropolymer Dispersions and 3.2.5 reprocessed PTFE, n—PTFE material produced by
Moulding and Extrusion Materials Part 2: Preparation of grinding PTFE material that has been both preformed and
Test Specimens and Determination of Properties
sintered.
3.2.6 sintering, n—as it applies to PTFE, a thermal treat-
3. Terminology
ment during which the PTFE is melted and recrystallized by
3.1 Definitions—The terminology given in Terminology
cooling, with coalescence occurring during the treatment.
D883 is applicable to this classification unless otherwise
3.2.7 suspension-based powder, n—fluoropolymer material
specified.
based on the type of polymerization normally related to the
3.1.1 bulk density, n—the mass per unit volume, in grams
production of granular PTFE resins.
per litre of a loosely packed material, such as a molding
3.3 Abbreviations—Abbreviated terms are in accordance
powder. D4895
with Terminology D1600.
3.1.2 lot, n—one production run or uniform blend of two or
more production runs. D4895
4. Classification
3.2 Definitions of Terms Specific to This Standard:
4.1 This classification covers two groups of fluoropolymer
3.2.1 direct polymerization powder, n—fluoropolymer ma-
micronized powders. Fluoropolymer micronized powders are
terial based on polymerizations designed to produce low
classified into groups according to their base fluoropolymer.
molecular weight PTFE resins with properties of materials
These groups are further subdivided into classes and grades as
described in this standard.
shown in Table 1.
3.2.2 dispersion-based powder, n—fluoropolymer material
based on the type of polymerization normally related to the
NOTE 1—An example of this classification system is as follows:
production of “paste or coagulated dispersion type” fluoropo-
The designation ASTM D5675 PTFE0111 indicates PTFE micronized
powder in accordance with Specification D5675:
lymer resins.
01 = PTFE resin,
3.2.3 micronized powder, n—a material comprised of par-
1 = suspension polymerization based, and
ticles reduced in average size to a dimension typically between
1 = formerly Type I, Grade 1, Class A, in
1 and 100 μm. Specification D5675 - 95a
with a particle size of 1 to <10 μm
3.2.4 reground PTFE, n—PTFE material produced by
(average diameter), a surface area of
grinding polytetrafluoroethylene (PTFE) material that has been
0.8 to 4.5 m /g, and a
preformed but has never been sintered. mass flow rate of >1 g/10 min using a load of 5 kg.
TABLE 1 Basic Properties
Particle Size,
A
Surface Area,
Melt-Flow Rate,
B
Group Description Class Description Grade Description Average Mass
g/10 min
m /g
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 D5675–95a, Type I, Grade 1, Class A.
E
Formerly Specification D5675–95a, Type I, Grade 1, Class B.
F
Formerly Specification D5675–95a, Type I, Grade 2, Class A.
G
Formerly Specification D5675–95a, Type I, Grade 2, Class B.
H
...
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