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ASTM D4181


Designation: D 4181 – 00

An American National Standard

Standard Classication for

Acetal (POM) Molding and Extrusion Materials1
This standard is issued un

der the xed designation D 4181; 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 * 1.1 This classication covers acetal materials suitable for molding and extrusion. This specication allows for the use of acetal plastic materials that are recycled, reconstituted, recycled-regrind, recovered, or reprocessed, or combination thereof, provided that the requirements as stated in this specication are met. It is the responsibility of the supplier and the buyer of recycled, reconstituted, recycled-regrind, recovered, or reprocessed acetal plastic materials, or combination thereof, to ensure compliance. (See Guide D 5033). 1.2 The properties included in this classication 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 specied by using the suffixes as given in Section 5. 1.3 This classication 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 eld 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 classication. 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 classication. 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—This classication is similar to ISO 9988-1 and 9988-2, although the technical content is signicantly different. NOTE 2—This classication was revised in 1992 to include international 4-mm specimens and test procedures as the standard for compli--`-`-`,,`,,`,`,,`---

ance. The 3.2-mm specimens, test methods, and Tables POM, A, and B that were superceded by the revision are included in Appendix X2, as a reference for those wishing to use them. It is recommended that the material manufacturer be consulted on all callouts against this classication.

2. Referenced Documents 2.1 ASTM Standards: D 618 Practice for Conditioning Plastics and Electrical Insulating Materials for Testing2 D 792 Test Methods for Specic Gravity (Relative Density) of Plastics by Displacement2 D 883 Terminology Relating to Plastics2 D 1238 Test Method for Flow Rates of Thermoplastics by Extrusion Plastometer2 D 1600 Terminology for Abbreviated Terms Relating to Plastics2 D 3418 Test Method for Transition Temperatures of Polymers by Thermal Analysis3 D 3641 Practice for Injection Molding Test Specimens of Thermoplastic Molding and Extrusion Materials3 D 3892 Practice for Packaging/Packing of Plastics3 D 4000 Classication System for Specifying Plastic Materials3 D 5033 Guide for the Development of Standards Relating to the Proper Use of Recycled Plastics4 D 5630 Test Method for Ash Content in Thermoplastics4 E 29 Practice for Using Signicant Digits in Test Data to Determine Conformance with Specications5 2.2 ISO Standards:6 ISO 75 Plastics and Ebonite—Determination of Temperature of Deection under Load ISO 178 Plastics—Determination of Flexural Properties of Rigid Materials ISO 180/1A Plastics—Determination of Izod Impact Strength of Rigid Materials ISO 527 Plastics—Determination of Tensile Properties ISO 1133 Plastics—Determination of Melt Flow Rate of Thermoplastics
Annual Book of ASTM Standards, Vol 08.01. Annual Book of ASTM Standards, Vol 08.02. 4 Annual Book of ASTM Standards, Vol 08.03. 5 Annual Book of ASTM Standards, Vol 14.02. 6 Available from American National Standards Institute, 11 W. 42nd St., 13th Floor, New York, NY 10036.
3 2

This classication is under the jurisdiction of ASTM Committee D20 on Plastics and is the direct responsibility of Subcommittee D20.15 on Thermoplastic Materials (Section D20.15.18). Current edition approved July 10, 2000. Published October 2000. Originally published as D 4181 – 83. Last previous edition D 4181 – 98.

1

*A Summary of Changes section appears at the end of this standard.
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D 4181
ISO 1183 Plastics—Methods for Determining the Density and Relative Density of Non-Cellular Plastics ISO 3146 Plastics—Determination of Melting Behavior (Melting Temperature or Melting Range) of SemiCrystalline Polymers ISO 3167 Plastics—Multipurpose Test Specimens ISO 9988-1 Plastics—Polyoxymethylene (POM) Moulding
TABLE POM

and Extrusion Materials—Part 1: Designation System and Basis for Specications ISO 9988-2 Plastics—Polyoxymethylene (POM) Moulding and Extrusion Materials—Part 2: Preparation of Test Specimens and Determination of Properties

Polyoxymethylene (Acetal) Materials, Detail RequirementsA,B,C (Natural and Black Color Only)
Melting Tensile Flow Rate Point, ISO Density, ISO Strength D F 1183, Description ISO 1133, 3146/ ISO g/10 min Method C2,E g/cm3 527,G °C, min MPa, min <8 8 to 19 19 to 30 30 to 55 <8 8 to 19 19 to 30 30 to 55 other <4 8 to 17 other <4 4 to 7 7 to 11 11 to 16 16 to 35 35 to 60 60+ <4 4 to 7 7 to 11 11 to 16 16 to 35 35 to 60 60+ other 11 to 28 11 to 28 4 to 12 4 to 12 other <20 11 to 16 other <2 other other 160 1.38 to 1.43 56 2250 3.5 80 155 155 1.26 to 1.32 1.38 to 1.43 20 64 800 2700 12.0 4.0 50 80 155 155 155 155 1.34 1.30 1.34 1.30 to to to to 1.40 1.38 1.40 1.40 46 40 44 35 1800 1400 1500 1300 4.5 4.5 5.0 5.0 70 60 70 60 160 160 160 160 160 160 160 160 160 160 160 160 160 160 160 160 160 160 1.38 to 1.43 1.38 1.38 1.38 1.38 1.38 1.38 1.40 1.45 1.50 1.54 1.38 1.38 1.38 1.38 1.38 1.38 1.38 to to to to to to to to to to to to to to to to to 1.43 1.43 1.43 1.43 1.43 1.43 1.52 1.55 1.60 1.65 1.43 1.43 1.43 1.43 1.43 1.43 1.43 58 58 58 58 60 60 60 70 80 80 80 56 56 57 57 58 58 58 2000 2200 2200 2000 2300 2500 2500 4000 5500 6500 7300 2000 2000 2000 2000 2100 2100 2100 4.0 3.5 3.5 3.0 3.0 2.5 2.0 3.0 3.0 3.0 3.0 4.0 3.5 3.5 3.0 3.0 2.5 2.0 80 80 80 80 80 80 80 150 150 150 150 80 80 80 80 80 80 80 170 170 170 1.31 to 1.37 1.36 to 1.42 1.32 to 1.38 35 45 35 800 1800 1100 50.0 8.0 12.0 50 65 55 170 170 170 170 170 170 170 170 170 170 1.39 to 1.44 1.39 1.39 1.39 1.45 1.55 1.39 1.39 1.39 1.39 to to to to to to to to to 1.44 1.44 1.44 1.53 1.63 1.44 1.44 1.44 1.44 65 65 65 65 80 125 65 65 65 65 Deection Izod Flexural Temperature, Impact Modulus, ISO 75/ Resistance, ISO 178, Method A,H ISO 180/1A, 1.82 MPa, MPa, min kJ/m2, min °C, min 2400 2700 2700 2700 3500 7000 2400 2700 2700 2700 7.0 4.5 4.5 4.0 3.0 6.0 7.0 4.5 4.5 4.5 80 80 85 85 150 160 75 75 75 75

Group Description Class

Description

Grade

1

Homopolymer

1

general purpose and high ow

1 2 3 4 G10 G25 0 1 2 3 4 0 1 2 3 0 1 2 3 4 5 6 7 G10 G15 G20 G25 0 1 2 3 4 5 6 7 0 1 2 3 4 0 1 4 0 1 0 0

10 % glass 25 % glass other

3

UV stabilized

4

impact modied other general purpose and high ow

2

Copolymer

0 1

10 % 15 % 20 % 25 % other

glass glass glass glass

2

UV stabilized

3

impact modied

4

exural modied high melt strength other

3 0
A B

Terpolymer Other

1 0

No descriptions are listed unless needed to describe a special grade under the class. All other grades are listed by requirements. 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 data base of sufficient size is generated. D Flow rate: 190/2.16 (T/M). E Melting point rate 10°C/min. TM second melting curve. See Test Method D 3418 for a similar method. F See Test Method D 792 for a similar method. G Crosshead speed shall be 50 mm/min 610 % 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 %. H Deection temperature shall be determined with the specimen in the atwise position (Method Af).

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D 4181
TABLE A
Designation Order Number 1 2 3 4 Property Tensile strength, ISO 527, min, MPaC Flexural modulus, ISO 178, min, MPa Izod impact, ISO 180/1A, min, kJ/m2 Deection temperature, ISO 75, Method Af, 1.82 MPa, min, °CE To be determined

Detail Requirements:A,B Filled or Reinforced Acetals
0 1 20 1500 2.5 80 2 35 2500 4.0 90 3 50 3500 5.0 100 4 65 4500 7.5 110 5 80 5500 10.0 120 6 95 6500 15.0 130 7 110 7500 20.0 140 8 125 8500 25.0 150 9 specify valueD specify valueD specify valueD specify valueD

unspecied unspecied unspecied unspecied

5
A

unspecied

...

...

...

...

...

...

...

...

It is recognized that detailed test values, particularly Izod 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 610 % 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 625 %. D If specic value is required, it must appear on the drawing or contract, or both. E Deection temperature shall be determined with the specimen in the atwise position (Method Af).

TABLE B
Designation Order Number 1 2 3 4 Property Tensile strength, ISO 527, min, MPaC Flexural modulus, ISO 178, min, MPa Izod impact, ISO 180/1A, min, kJ/m2 Deection temperature, ISO 75, Method Af, 1.82 MPa, min, °CE To be determined 0 unspecied unspecied unspecied unspecied

Detail Requirements:A,B Special Acetals
1 10 300 2.0 40 2 25 1000 4.0 55 3 40 1700 6.0 70 4 55 2400 10.0 85 5 70 3100 14.0 100 6 85 3800 18.0 115 7 100 4500 24.0 130 8 115 5200 30.0 145 9 specify valueD specify valueD specify valueD specify valueD

5
A

unspecied

...

...

...

...

...

...

...

...

It is recognized that detailed test values, particularly Izod 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 610 % 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 625 %. D If specic