ASTM D6778-02

Standard Classification for Polyoxymethylene (POM, Acetal) Molding and Extrusion Materials

SCOPE
1.1 This classification covers polyoxymethylene materials suitable for molding and extrusion. This specification allows for the use of polyoxymethylene plastic materials that are recycled, reconstituted, recycled-regrind, recovered, or reprocessed, or combination thereof, provided that the requirements as stated in this specification are met. It is the responsibility of the supplier and the buyer of recycled, reconstituted, recycled-regrind, recovered, or reprocessed polyoxymethylene plastic materials, or combination thereof, to ensure compliance. (See Guide D 5033).
1.2 The properties included in this classification are those required to identify the compositions covered. There may be other requirements necessary to identify particular characteristics important to specialized applications. These may be specified by using the suffixes as given in Section 5.
1.3 This classification and subsequent line callout 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 should be made by those having expertise in the field of plastics design 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.
1.4 The values stated in SI units are to be regarded as the standard.
1.5 The following precautionary caveat pertains only to the test method portion, Section 11, of this classification. 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 requirements prior to use.
Note 1—This classification is similar to ISO 9988-1 and 9988-2, although the technical content is significantly different.

General Information

• Status: Historical
• Publication Date: 09-Mar-2002
• ICS: 83.140.01 - Rubber and plastics products in general
• Technical Committee: D20 - Plastics
• Drafting Committee: D20.15 - Thermoplastic Materials

Relations

• Replaced By: ASTM D6778-03 - Standard Classification for Polyoxymethylene (POM, Acetal) Molding and Extrusion Materials
• Effective Date: 01-Nov-2003
• Referred By: ASTM D6100-17 - Standard Specification for Extruded, Compression Molded and Injection Molded Polyoxymethylene Shapes (POM)
• Effective Date: 10-Mar-2002
• Referred By: ASTM D955-21 - Standard Test Method of Measuring Shrinkage from Mold Dimensions of Thermoplastics
• Effective Date: 10-Mar-2002
• Referred By: ASTM D4000-23 - Standard Classification System for Specifying Plastic Materials
• Effective Date: 10-Mar-2002

Standards Content (Sample)

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.
Designation: D 6778 – 02
Standard Classification for
Polyoxymethylene (POM, Acetal) Molding and Extrusion
Materials
This standard is issued under the fixed designation D 6778; 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 2. Referenced Documents
1.1 This classification covers polyoxymethylene materials 2.1 ASTM Standards:
suitable for molding and extrusion. This specification allows D 618 Practice for Conditioning Plastics for Testing
for the use of polyoxymethylene plastic materials that are D 883 Terminology Relating to Plastics
recycled, reconstituted, recycled-regrind, recovered, or repro- D 1600 Terminology for Abbreviated Terms Relating to
cessed, or combination thereof, provided that the requirements Plastics
as stated in this specification are met. It is the responsibility of D 3641 Practice for Injection Molding Test Specimens of
the supplier and the buyer of recycled, reconstituted, recycled- Thermoplastic Molding and Extrusion Materials
regrind, recovered, or reprocessed polyoxymethylene plastic D 3892 Practice for Packaging/Packing of Plastics
materials, or combination thereof, to ensure compliance. (See D 4000 Classification System for Specifying Plastic Mate-
Guide D 5033). rials
1.2 The properties included in this classification are those D 5033 Guide for the Development of ASTM Standards
required to identify the compositions covered. There may be Relating to Recycling and Use of Recycled Plastics
other requirements necessary to identify particular character- E 29 Practice for Using Significant Digits in Test Data to
istics important to specialized applications. These may be Determine Conformance with Specifications
specified by using the suffixes as given in Section 5. 2.2 ISO Standards:
1.3 This classification and subsequent line callout are in- ISO 75-1 Plastics and Ebonite—Determination of Tempera-
tended to provide a means of calling out plastic materials used ture of Deflection under Load—Part 1: General Test
in the fabrication of end items or parts. It is not intended for the Methods
selection of materials. Material selection should be made by ISO 75-2 Plastics—Determination of Temperature of De-
those having expertise in the field of plastics design after flection under Load—Part 2: Plastics and Ebonite
careful consideration of the design and the performance ISO 179-1 Plastics—Determination of Charpy Impact
required of the part, the environment to which it will be Properties—Part 1: Non-instrumented Impact Test
exposed, the fabrication process to be employed, the costs ISO 294-1 Plastics—Injection Moulding Of Test Specimens
involved, and the inherent properties of the material other than Of Thermoplastic Materials—Part 1: General Principles,
those covered by this classification. and Moulding of Multipurpose and Bar Test Specimens
1.4 The values stated in SI units are to be regarded as the ISO 527-1 Plastics—Determination of Tensile Properties—
standard. Part 1: General Principals
1.5 The following precautionary caveat pertains only to the ISO 527-2 Plastics—Determination of Tensile Properties—
test method portion, Section 11, of this classification. This Part 2: Test Conditions for Moulding and Extrusion
standard does not purport to address all of the safety concerns, Plastics
if any, associated with its use. It is the responsibility of the user ISO 1133 Plastics—Determination of the Melt Mass Flow
of this standard to establish appropriate safety and health Rate (MFR) and the Melt Volume-Flow Rate (MVR) of
practices and determine the applicability of regulatory require- Thermoplastics
ments prior to use. ISO 11357-3 Plastics—Differential Scanning Calorimetry
(DSC)—Part 3: Determination of Temperature and En-
NOTE 1—This classification is similar to ISO 9988-1 and 9988-2,
thalpy of Melting and Crystallization
although the technical content is significantly different.
Annual ASTM Book of Standards, Vol 08.01.
Annual ASTM Book of Standards, Vol 08.02.
1 4
This classification is under the jurisdiction of ASTM Committee D20 on Annual ASTM Book of Standards, Vol 08.03.
Plastics and is the direct responsibility of Subcommittee D20.15 on Thermoplastic Annual ASTM Book of Standards, Vol 14.02.
Materials (Section D20.15.18). Available from American National Standards Institute, 25 W. 43rd St., 4th
Current edition approved March 10, 2002. Published May 2002. Floor, New York, NY 10036.
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 6778
ISO 1183 Plastics—Methods for Determining the Density ISO 9988-2 Plastics—Polyoxymethylene (POM) Moulding
and Relative Density of Non-Cellular Plastics
and Extrusion Materials—Part 2: Preparation of Test
ISO 3167 Plastics—Multipurpose Test Specimens
Specimens and Determination of Properties
ISO 9988-1 Plastics—Polyoxymethylene (POM) Moulding
and Extrusion Materials—Part 1: Designation System and
Basis for Specifications
A,B,C
TABLE POM Polyoxymethylene Materials, Detail Requirements (Natural and Black Color Only)
Charpy Deflection
Melting
Tensile Tensile Impact Temperature,
Flow Rate Point, Density,
Strength, Modulus, Resistance, ISO 75/
D
Group Description Class Description Grade Description ISO 1133, ISO ISO 1183,
F G H I
ISO 527, ISO 527 ISO 179 / Method A
E 3 f
G/10 min 11357-3 g/cm
MPa, min MPa, min 1eA, kJ/m , 1.82 MPa,
°C, min
min °C, min
01 Homopolymer 1 general purpose and 1 <4 170 1.39 to 1.44 65 2400 7.0 80
high flow 2 4 to 10 170 1.39 to 1.44 65 2500 6.0 80
3 8 to 19 170 1.39 to 1.44 65 2700 4.5 80
4 19 to 30 170 1.39 to 1.44 65 2700 4.5 85
5 30 to 55 170 1.39 to 1.44 65 2700 4.0 85
G10 10 % glass 170 1.45 to 1.53 80 3500 3.0 150
G25 25 % glass 170 1.55 to 1.63 125 7000 6.0 160
0 other
3 UV stabilized 1 <8 170 1.39 to 1.44 65 2400 7.0 75
2 8 to 19 170 1.39 to 1.44 65 2700 4.5 75
3 19 to 30 170 1.39 to 1.44 65 2700 4.5 75
4 30 to 55 170 1.39 to 1.44 65 2700 4.5 75
0 other
4 impact modified 1 <4 170 1.31 to 1.37 35 800 50.0 50
2 8 to 17 170 1.36 to 1.42 45 1800 8.0 65
3 170 1.32 to 1.38 35 1100 12.0 55
0 other 0 other
02 Copolymer 1 general purpose and 1 <4 160 1.38 to 1.43 58 2000 4.0 80
high flow 2 4 to 7 160 1.38 to 1.43 58 2200 3.5 80
3 7 to 11 160 1.38 to 1.43 58 2200 3.5 80
4 11 to 16 160 1.38 to 1.43 58 2000 3.0 80
5 16 to 35 160 1.38 to 1.43 60 2300 3.0 80
6 35 to 60 160 1.38 to 1.43 60 2500 2.5 80
7 60+ 160 1.38 to 1.43 60 2500 2.0 80
G10 10 % glass 160 1.40 to 1.52 70 4000 3.0 150
G15 15 % glass 160 1.45 to 1.55 80 5500 3.0 150
G20 20 % glass 160 1.50 to 1.60 80 6500 3.0 150
G25 25 % glass 160 1.54 to 1.65 80 7300 3.0 150
0 other
2 UV stabilized 1 <4 160 1.38 to 1.43 56 2000 4.0 80
2 4 to 7 160 1.38 to 1.43 56 2000 3.5 80
3 7 to 11 160 1.38 to 1.43 57 2000 3.5 80
4 11 to 16 160 1.38 to 1.43 57 2000 3.0 80
5 16 to 35 160 1.38 to 1.43 58 2100 3.0 80
6 35 to 60 160 1.38 to 1.43 58 2100 2.5 80
7 60+ 160 1.38 to 1.43 58 2100 2.0 80
0 other
3 impact modified 1 11 to 28 155 1.34 to 1.40 46 1800 4.5 70
2 11 to 28 155 1.30 to 1.38 40 1400 4.5 60
3 4 to 12 155 1.34 to 1.40 44 1500 5.0 70
4 4 to 12 155 1.30 to 1.40 35 1300 5.0 60
0 other
4 high modulus 4 11 to 16 155 1.38 to 1.43 64 2700 4.0 80
0 other
03 Terpolymer 1 high melt strength 1 <2 160 1.38 to 1.43 56 2250 3.5 80
0 other
00 Other 0 other 0 other
A
No descriptions are listed unless needed to describe a special grade under the class. All other grades are listed by requirements.
B
Refer to 9.1 under Specimen Preparation for source of test pieces.
C
Data on 4 mm test specimens may be limited and the minimum values may be changed in a later revision after a statistical database of sufficient size is generated.
D
Flow rate: 190/2.16 (T/M).
E
Melting point rate 10°C/min. T second melting curve.
M
F
Crosshead speed shall be 50 mm/min 6 10 % unless the specimen exhibits brittle failure (no yield point) and strain at break of <10 % in which case crosshead speed
shall be 5 mm/min 6 25 %.
G
Crosshead speed shall be 1 mm/min.
H
Notched specimen tested edgewise (method 1eA).
I
Deflection temperature shall be determined with the specimen in the flatwise position (Method A ).
f
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 6778
A,B
TABLE A Detail Requirements: Filled or Reinforced Polyoxymethylene
Designation
Order Property 0 12345678 9
Number
D
1 Tensile strength, ISO 527, unspecified 20 35 50 65 90 110 130 150 specify value
C
min, MPa
D
2 Tensile modulus, ISO 527, unspecified 1500 2500 3500 4500 5500 6500 7500 8500 specify value
E
min, MPa
D
3 Charpy impact, ISO 179/1eA, unspecified 1.0 2.0 3.0 4.0 6.0 10.0 20.0 40.0 specify value
min, kJ/m
D
4 Deflection temperature, unspecified 50 70 90 110 120 130 140 150 specify value
ISO 75, Method A ,
f
F
1.82 MPa, min, °C
5 To be determined unspecified . . . . . . . . . . . . . . . . . . . . . . . . . . .
A
It is recognized that detailed test values, particularly Charpy impact, may not predict nor even correlate with the performance of parts molded of these materials.
B
Refer to 9.1 under Specimen Preparation for source of test specimens.
C
Crosshead speed shall be 50 mm/min 6 10 % unless the specimen exhibits brittle failure (no yield point) and a strain at break of <10 % in which case crosshead speed
shall be 5 mm/min 6 25 %.
D
If specific value is required, it must appear on the drawing or contract, or both.
E
Crosshead speed shall be 1 mm/min-(method 1eA).
F
Deflection temperature shall be determined with the specimen in the flatwise position (Method A ).
f
A,B
TABLE B Detail Requirements: Special Polyoxymethylene
Designation
Order Property 0 1 2 345678 9
Number
D
1 Tensile strength, ISO 527, unspecified 10 20 30 40 50 60 70 80 specify value
C
min, MPa
D
2 Tensile modulus, ISO 527 unspecified 200 600 1000 1400 1800 2200 2600 3000 specify value
E
min, MPa
D
3 Charpy impact, ISO 179/1eA, unspecified 1.0 2.0 3.0 4.0 6.0 10.0 20.0 50.0 specify value
min, kJ/m
D
4 Deflection temperature, unspecified 40 55 70 80 90 100 110 120 specify value
ISO 75, Method A ,
f
F
1.82 MPa, min, °C
5 To be determined unspecified . . . . . . . . . . . . . . . . . . . . . . . . . . .
A
It is recognized that detailed test values, particularly Charpy impact, may not predict nor even correlate with the performance of parts molded of these materials.
B
Refer to 9.1 under Specimen Preparation for source of test specimens.
C
Crosshead speed shall be 50 mm/min 6 10 % unless the specimen exhibits brittle failure (no yield point) and a strain at break of <10 % in which case crosshead speed
shall be 5 mm/min 6 25 %.
D
If specific value is required, it must appear on the drawing or contract, or both.
E
Crosshead speed shall be 1 mm/min (method 1eA).
F
Deflection temperature shall be determined with the specimen in the flatwise position (Method A ).
f
3. Terminology and Table A or B is used to specify the property requirements
after the addition of reinforcement, pigments, fillers, or lubri-
3.1 The terminology used in this classification is in accor-
cants at the nominal level indicated (see 4.2.1).
dance with Terminologies D 883 and D 1600.
4.2.1 Reinforced versions of the basic materials are identi-
4. Classification
fied by a single letter that indicates the reinforcement used and
4.1 Unreinforced polyoxymethylene materials are classified
two digits that indicate the nominal quantity in percent by
into groups in accordance with their composition. These
weight. Thus, a letter designation G for glass-reinforced and 33
groups are subdivided into classes and grades, as shown in
for percent of reinforcement, G33, specifies a filled material
Table POM.
with a nominal glass level of 33 %. The reinforcement letter
designations and associated tolerance levels are shown as
NOTE 2—An example of this classification system is as follows. The
follows:
designation POM0112 indicates the following: POM = polyoxymethylene
(acetal) as found in Terminology D 1600, 01 = homopolymer (group),
Symbol Material Tolerance
1 = general purpose and high flow (class), and 2 = requirements given in C carbon and graphite 62%
fiber-reinforced
Table POM (grade).
G glass-reinforced 62%
4.1.1 To facilitate the incorporation of future or special
L lubricants (such as, PTFE, depends upon material
graphite, silicone, and and process to
materials, the “other/unspecified” category (0) for group, class,
molybdenum disulfide) be specified
and grade is shown in Table POM. The basic properties can be
M mineral-reinforced 62%
obtained from Tables A or B, as they apply (see 4.3). R combinations of reinforcements 63%
or fillers, or both
4.2 Reinforced, filled, lubricated and special versions of the
polyoxymethylene materials that are not in Table POM are
NOTE 3—This part of the classification system uses the percent of
classified in accordance with Table POM and Tables A or B.
reinforcements or additives, or both, in the callout of the modified basic
Table POM is used to specify the group of polyoxymethylene material. The types and percentages of reinforcements and additives
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 6778
should be shown on the supplier’s technical data sheet, unless they are
5. Suffix Requirements
proprietary in nature. If necessary, additional callout of these reinforce-
5.1 When additional requirements are needed that are not
ments and additives can be accomplished by use of the suffix part of the
covered by the basic requirements or cell-table requirements,
system (see 1.2).
they shall be indicated through the use of suffixes.
4.2.2 Specific requirements for reinforced, filled, lubricated
5.2 A list of suffixes can be found in Classification System
or special polyoxymethylene materials shall be shown by a
D 4000 (Table 3) and may be used for additional requirements
six-character designation. The designation will consist of the
as appropriate. Additional suffixes will be added to that
letter A or B and the five digits comprising the cell numbers for
standard as test methods and requirements are developed and
the property requirements in the order as they appear in Tables
request
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