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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 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).

3. Terminology 3.1 The terminology used in this classication is in accordance with Terminologies D 883 and D 1600. 4. Classication 4.1 Unreinforced acetal materials are classied into groups according to their composition. These groups are subdivided into classes and grades, as shown in Table POM.
NOTE 3—An example of this classication system is as follows. The designation POM112 indicates the following: POM = polyoxymethylene (acetal) as found in Terminology D 1600, 1 = homopolymer (group), 1 = general purpose and high ow (class), and 2 = requirements given in Table POM (grade).
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4.2.1 Reinforced versions of the basic materials are identied by a single letter that indicates the reinforcement used and two digits that indicate the nominal quantity in percent by weight. Thus, a letter designation G for glass-reinforced and 33 for percent of reinforcement, G33, species a lled material with a nominal glass level of 33 %. The reinforcement letter designations and associated tolerance levels are shown as follows:
Symbol C G L Material carbon and graphite ber-reinforced glass-reinforced lubricants (such as, PTFE, graphite, silicone, and molybdenum disulde) mineral-reinforced combinations of reinforcements or llers, or both Tolerance 62 % 62 % depends upon material and process to be specied 62 % 63 %

4.1.1 To facilitate the incorporation of future or special materials, the “other/unspecied” category (0) for group, class, and grade is shown in Table POM. The basic properties can be obtained from Tables A or B, as they apply (see 4.3). 4.2 Reinforced, lled, and lubricated versions of the acetal materials that are not in Table POM are classied in accordance with Table POM and Tables A or B. Table POM is used to specify the group of acetal and Table A or B is used to specify the property requirements after the addition of reinforcement, pigments, llers, or lubricants at the nominal level indicated (see 4.2.1).
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M R

NOTE 4—This part of the classication system uses the percent of reinforcements or additives, or both, in the callout of the modied basic material. The types and percentages of reinforcements and additives should be shown on the supplier’s technical data sheet, unless they are proprietary in nature. If necessary, additional callout of these reinforcements and additives can be accomplished by use of the suffix part of the system (see Section 1.5).

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D 4181
4.2.2 Specic requirements for reinforced, lled, or lubricated acetal materials shall be shown by a six-character designation. The designation will consist of the letter A or B and the ve digits comprising the cell numbers for the property requirements in the order as they appear in Tables A or B. 4.2.2.1 Although the values listed are necessary to include the range of properties available in existing materials, users should not infer that every possible combination of the properties exists or can be obtained. 4.2.3 When the grade of the basic material is not known or is not important, the use of “0” grade classication will be used for reinforced materials in this system.
NOTE 5—An example of this classication for a reinforced acetal material is as follows. The designation POM210G25A65380 indicates the following material requirement:

as appropriate. Additional suffixes will be added to that standard as test methods and requirements are developed and requested. 6. General Requirements 6.1 Basic requirements from property tables of cell tables are always in effect unless superseded by specic suffix requirements, which always take precedence. 6.2 The plastics composition shall be uniform and shall conform to the requirements specied herein. 7. Detail Requirements 7.1 The materials shall conform to the requirements in Tables POM, A, and B and suffix requirements, as they apply. 7.2 For the purposes of determining conformance, all specied limits for a specication (line callout) based on this classication system are absolute limits, as dened in Practice E 29. 7.3 With the absolute method, an observed value or a calculated value is not rounded, but is to be compared directly with the limiting value. Conformance or nonconformance is based on this comparison. 8. Sampling 8.1 Sampling shall be statistically adequate to satisfy the requirements of 12.4. 8.2 A batch or lot shall be constituted as a unit of manufacture as prepared for shipment, and may consist of a blend of two or more “production runs.” 9. Specimen Preparation 9.1 Test pieces for relevant test methods shall be based on the injection molded ISO 3167 Type 1A multipurpose test specimen. The following pieces are to be used for the listed relevant test methods.
Test Piece ISO 3167 Type 1A Bar 80 6 2 mm 3 10 6 0.2 mm 3 4 6 0.2 mm cut from the center portion of ISO 3167 Type 1A Bar Specimen approximately 10 3 10 3 4 mm cut from center of ISO 3167 Type 1A Bar Relevant Test Method Tensile strength by ISO 527 Flexural modulus by ISO 178 Izod impact resistance by ISO 180/1A Deection temperature by ISO 75/Method Af Density by ISO 1183

POM = Polyoxymethylene (acetal) as found in Terminology D 1600, 2 = Copolymer (group), 1 = General purpose and high ow (class), 0 = Other (grade), G 25 = Glass-reinforced at 25 % nominal level, A = Table A property requirements, 6 = Tensile strength, 95 MPa, min, 5 = Flexural modulus, 5500 MPa, min, 3 = Izod impact, 5.0 kJ/m2, min, 8 = Deection temperature, 150°C, min, and 0 = Unspecied. If no properties are specied, the designation would be POM210G25A00000. 4.3 Table B has been incorporated into this classication to facilitate the classication of special materials where Table POM or Table A does not reect the required properties. Table B shall be used in the same manner as Table A.
NOTE 6—The mechanical properties of pigmented or colored acetal materials can differ from the mechanical properties of natural acetal material, depending on the choice of colorants and the concentration. The main property affected is ductility, as illustrated by a reduction in Izod impact strength. If specic properties of pigmented materials are necessary, Table B should be employed to specify property requirements. NOTE 7—An example of this classication system for a special acetal material is as follows. The designation POM110B44250 indicates:

POM = Polyoxymethylene (acetal) as found in Terminology D 1600, 1 = Homopolymer (group), 1 = General purpose and high ow (class), 0 = Other (grade), B = Table B property requirements, 4 = Tensile strength, 55 MPa, min, 4 = Flexural modulus, 2400 MPa, min, 2 = Izod impact, 4.0 kJ/m2, min, 5 = Deection temperature, 100°C, min, and 0 = Unspecied. 5. Suffix Requirements 5.1 When additional requirements are needed that are not covered by the basic requirements or cell-table requirements, they shall be indicated through the use of suffixes. 5.2 A list of suffixes can be found in Classication System D 4000 (Table 3) and may be used for additional requirements
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9.2 The test specimens shall be molded by injection molding in accordance with Practice D 3641. Recommended processing conditions are shown in Table 1.
TABLE 1 Conditions for Injection Molding of Test Specimens
Material Holopolymer, MFR #7 Holopolymer, MFR >7 Holopolymer, impact modied, MFR #7 Copolymer, MFR >4 Copolymer impact modied Copolymer, MFR <4 Melt Temperature, °C 215 215 210 205 205 205 Mold Temperature, °C 90 90 60 90 80 90 Average Injection Velocity, mm/s 140 6 100 300 6 100 140 6 100 200 6 100 200 6 100 140 6 100

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D 4181
10. Conditioning 10.1 Test specimens shall be conditioned in the standard laboratory atmosphere for a minimum of 16 h (Condition 16/23/50, Practice D 618) before performing the required tests. 10.2 Conduct tests in the standard laboratory atmosphere of 23 6 2°C and 50 6 5 % relative humidity in accordance with Practice D 618. 11. Test Methods 11.1 Determine the properties enumerated in this classication by means of the test methods in Section 1.1. 11.1.1 The number of tests shall be consistent with the requirements of Section 8 and 12.4. 12. Inspection and Certication 12.1 Inspection and certication of the material supplied with reference to a specication based on this classication system shall be for conformance to the requirements specied herein. 12.2 Lot-acceptance inspection shall be the basis on which acceptance or rejection of the lot is made. The lot-acceptance inspection shall consist of: melt ow rate or reinforcement content. 12.3 Periodic check inspection with reference to a specication based on this classication system shall consist of the tests for all requirements of the material under the specication. Inspection frequency shall be adequate to ensure the material is certiable in accordance with 12.4. 12.4 Certication shall be that the material was manufactured by a process in statistical control, sampled, tested, and inspected in accordance with this classication system and that the average values for the lot meet the requirements of the specication (line callout). 12.5 A report of the test results shall be furnished when requested. The report shall consist of the results of the lot-acceptance inspection for the shipment and the results of the most recent periodic-check inspection. If requested, the report shall include that recycled, reconstituted, recycledregrind, recovered, or reprocessed acetal plastic, or combination thereof, was used and the nominal weight percent. 13. Packaging and Marking 13.1 For packing, packaging, and marking, the provisions of Practice D 3892 apply. 14. Keywords 14.1 acetal; acetal copolymer; acetal homopolymer; acetal terpolymer; classication; classication system; line callout; L-P-392A; MIL-P-46137A (MR); plastic materials; polyacetal; polyformaldehyde; polyoxymethylene; POM

APPENDIXES
(Nonmandatory Information) X1. CROSS-REFERENCES TO MIL-P-46137A (MR) AND L-P-392A

ASTM D 4181 POM POM POM POM POM POM POM POM POM POM POM POM POM POM POM POM 111 G20A35070 111 G30A45080 111 G40A46080 213 G25A66360 213 G20A45080 213 G30A47080 213 G40A48080 ASTM D 4181 111 112/POM 113 130 B44240 132 211/POM 311 213/POM 214 220 B43250 221 223 Type Type Type Type Type Type Type Type Type II Class 1 I Class 1 I Class 2 I Class 3 II Class 1 I Class 1 I Class 2 I Class 3 I Class 3 Type Type Type Type Type Type Type I Class 20 I Class 30 I Class 40 II Grade A Class 25 II Grade B Class 20 II Grade B Class 30 II Grade B Class 40

MIL-P-46137A (MR)

L-P-392A

X2. REFERENCE TO PREVIOUS EDITION

X2.1 Referenced Documents X2.1.1 ASTM Standards: D 256 Test Methods for Impact Resistance of Plastics and
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Electrical Insulating Materials.2 D 638M Test Method for Tensile Properties of Plastics (Metric)2
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D 4181
D 648 Test Method for Deection Temperature of Plastics Under Flexural Load2 D 790M Test Methods for Flexural Properties of Unreinforced and Reinforced Plastics and Electrical Insulating Materials (Metric)2 D 792 Test Methods for Specic Gravity (Relative Density) of Plastics by Displacement2 D 1238 Test Method for Flow Rates of Thermoplastics by Extrusion Plastometer2 D 3418 Test Method for Transition Temperatures of Polymers by Thermal Analysis4

TABLE X2.1 Polyoxymethylene (Acetal) Materials, Detail Requirements, Natural Color Only (Table POM, D 4181 – 92)
Melting Flexural Deection Point, Izod Impact Tensile Elongation Modulus, Temperature, Flow Rate, ASTM Resistance, Specic Strength, (Ultimate), DescripASTM ASTM D 648, ASTM D 3418 or ASTM ASTM Gravity ASTM tionA D 790M, 1.82 MPa, D 1238Bg/ C C DTA/DSC, ASTM D 792 D 638M , D 638M , D 256, min, 10 min min, min, min, MPa Min, % min, J/m MPa °C °C <4 4 to 7.5 7.5 to 13 13 to 25 other 5.5 to 8.0 9.0 to 15.0 other <4 4 to 7.5 other <1.2 4.2 to 6.5 other <4 4 to 7 7 to 11 11 to 16 16 to 35 35 to 60 60+ other <4 4 to 7 7 to 11 11 to 16 16 to 35 35 to 60 60+ other
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Group

Description

Class

Description

Grade

1 Homopolymer

1

general purpose and high ow

2

fast cycle

3

UV stabilizedD

4 0 1

impact modied other general purpose and high ow

2

Copolymer

2

UV stabilized

3

impact modied

4 3 Terpolymer 1

exural modied high melt strength other

1 2 3 4 0 1 2 0 1 2 0 1 2 0 1 2 3 4 5 6 7 0 1 2 3 4 5 6 7 0 1 2 3 4 5 0 1 0 1 0 0

172 172 172 172 172 172 172 172 170 170 160 160 160 160 160 160 160 160 160 160 160 160 160 160 155 155 155 155 155 155 160

1.39 1.39 1.39 1.39

to to to to

1.44 1.44 1.44 1.44

62 62 62 62 62 62 62 62 38 52 55 55 55 55 55 55 55 58 55 55 55 55 55

60 25 15 10 20 15 30 15 100 40 40 40 40 35 20 15

2400 2700 2700 2700 2400 2400 2400 2700 1110 2070 2270 2270 2270 2270 2270 2270

110 59 53 45 53 53 110 59 750 96 48 48 48 48 40 35

115 115 115 115 100 100 115 115 70 80 105 105 105 105 105 105

1.39 to 1.44 1.39 to 1.44 1.39 to 1.44 1.39 to 1.44 1.31 to 1.37 1.36 to 1.42 1.38 1.38 1.38 1.38 1.38 1.38 1.38 1.38 1.38 1.38 1.38 1.38 1.38 1.38 1.36 1.35 1.37 1.35 1.34 to to to to to to to to to to to to to to to to to to to 1.42 1.42 1.42 1.42 1.42 1.42 1.42 1.42 1.42 1.42 1.42 1.42 1.42 1.42 1.42 1.39 1.41 1.39 1.38

40 40 40 35 20 15

2270 2270 2270 2270 2270 2270

48 48 48 48 35 20

105 105 105 105 105 105

<24 <22 <12 <11 <11 other <20 other <2 other other

40 35 40 35 35 15 55

40 55 40 60 60 100 25

1700 1320 1700 1320 1500 680 2065

40 55 65 95 125 110 30

80 78 80 78 78 52 105

1.27 to 1.31 1.38 to 1.42

0
A B

Other

0

No descriptions are listed unless needed to describe a special grade under the class. All other grades are listed by requirements. Flow rate: Group 1—190/1.05 Group 2—190/2.16 C Tensile strength and elongation shall be determined using a Type I tensile specimen as described in Test Method D 638M. Crosshead speed shall be 5 mm/min 625 %. D Practice G 23, Type E apparatus, 500-h exposure, with 50 % minimum retention of original elongation.

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D 4181
TABLE X2.2 Detail RequirementsA Filled or Reinforced Acetals (Table A, D 4181 – 92)
Designation Order Number 1 2 3 4 5
A B

Property

0

1 20 1500 25 80 ...

2 35 2500 40 90 ...

3 50 3500 50 100 ...

4 65 4500 75 110 ...

5 80 5500 100 120 ...

6 95 6500 150 130 ...

7 110 7500 200 140 ...

8 125 8500 250 150 ... specify specify specify specify

9 valueD valueD valueD valueD

unspecied Tensile strength, ASTM D 638, min, MPaB,C Flexural modulus, ASTM D 790, min, MPaB unspecied E Izod impact, ASTM D 256, min, J/m unspecied Deection temperature, ASTM D 648, 1.82 MPa, min, °C unspecied To be determined 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. MPa 3 145 = psi. Tensile strength shall be determined using a Type I tensile specimen, as described in Test Method D 638. 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 J/m2 3 18.73 3 103 = ft lbf/in.
C

TABLE X2.3 Detail RequirementsA Special Acetals (Table B, D 4181 – 92)
Designation Order Number 1 2 3 4 5
A B

Property Tensile strength, ASTM D 638, min, MPaB,C Flexural modulus, ASTM D 790, min, MPaB Izod impact, ASTM D 256, min, J/m2D Deection temperature, ASTM D 648, 1.82 MPa, min, °C To be determined

0 unspecied unspecied unspecied unspecied unspecied

1 10 300 20 40 ...

2 25 1000 40 55 ...

3 40 1700 60 70 ...

4 55 2400 100 85 ...

5 70 3100 140 100 ...

6 85 3800 180 115 ...

7 100 4500 240 130 ...

8 115 5200 300 145 ... specify specify specify specify

9 valueD valueD valueD valueD

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. MPa 3 145 = psi. C Tensile strength shall be determined using a Type I tensile specimen, as described in ISO 527. Crosshead speed shall be 50 mm/min 625 %. D If specic value is required, it must appear on the drawing or contract, or both.

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D 4181
TABLE X2.4 Polyoxymethylene (Acetal) Materials, Detail Requirements,A Natural Color Only (Table POM, D 4181 – 97)
Deection Melting Flexural Izod Impact Flow Rate, Tensile Temperature, Point, Modulus, Resistance, ISO Strength, ISO 75/ Density, ISO ISO 3146/ ISO ISO 180/ 1133,C ISO Method A,A 1183,Eg/cm3 F g/10 Method 527, MPa, 178,GMPa, 1A,HkJ/m2, 1.82 MPa, min min min min C2,D°C, min °C, min <8 170 1.39 to 1.44 65 2400 8.5 100

Group

Description

Class

Description

Grade DescriptionB

1

Homopolymer

1

general purpose and high ow

1

2

3

4

2

Copolymer

0 1

2

3

4 0 1

3

Terpolymer

0
A

Other

0 0

2 3 4 0 fast cycle 1 2 0 UV stabilized 1 2 0 impact modified 1 2 0 other 0 general 1 purpose and high ow 2 3 4 5 6 7 0 UV stabilized 1 2 3 4 5 6 7 0 impact modified 1 2 3 4 5 0 flexural modified 1 0 other 0 high 1 melt strength 0 other 0 other 0

8 to 16 16 to 28 28 to 55 other 11 to 18 19 to 33 other <8 8 to 16 other <3 8 to 15 other other <4

170 170 170 170 170 170 170 170 170

1.39 to 1.44 1.39 to 1.44 1.39 to 1.44 1.39 to 1.44 1.39 to 1.44 1.39 to 1.44 1.39 to 1.44 1.31 to 1.37 1.36 to 1.42

65 65 65 65 65 65 65 35 45

2700 2700 2700 2400 2400 2400 2700 1100 1900

5.0 4.5 4.0 4.5 4.0 8.5 5.0 70 9.0

100 105 105 100 100 100 100 70 80

Deection temperature shall be determined by specimen 80 6 2 mm 3 10 6 0.2 mm 3 4 6 0.2 mm (Method A). B No descriptions are listed unless needed to describe a special grade under the class. All other grades are listed by requirements. C Flow rate: 190/2.16 (T/M). D Melting point rate 10°C/min. TM second melting curve. See Test Method D 3418 for a similar method. E See Test Methods D 792 for a similar method. F Tensile strength shall be determined using a Type I tensile specimen as described in ISO 527. Crosshead speed shall be 50 mm/min 610 %. G Flexural modulus shall be determined by specimen 80 6 2 mm 3 10 6 0.2 mm 3 4 6 0.2 mm as described in ISO 178. H Izod shall be determined by specimen 80 6 2 mm 3 10 6 0.2 mm 34 6 0.2 mm (Method A).

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--`-`-`,,`,,`,`,,`---

160

1.38 to 1.43

58

2300

5.5

90

4 to 7 7 to 11 11 to 16 16 to 35 35 to 60 60+ other <4 4 to 7 7 to 11 11 to 16 16 to 35 35 to 60 60+ other 11 to 26 11 to 26 4 to 11 5 to 11 other <20 other other <2 other other other

160 160 160 160 160 160 160 160 160 160 160 160 160 155 155 155 155 155 155

1.38 1.38 1.38 1.38 1.38 1.38 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

1.43 1.43 1.43 1.43 1.43 1.43 1.43 1.43 1.43 1.43 1.43 1.43 1.43

58 58 58 58 58 58 58 58 58 58 58 58 58

2300 2300 2300 2300 2300 2300 2300 2300 2300 2300 2300 2300 2300

4.5 4.0 4.0 3.5 3.0 2.5 5.5 4.5 4.0 4.0 3.5 3.0 2.5

90 95 95 95 95 95 90 90 95 95 95 95 95

1.34 to 1.40

40

1500

6.0

70

1.26 to 1.32

20

800

12.0

50

160

1.38 to 1.43

56

2250

3.5

90

8
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D 4181
SUMMARY OF CHANGES This section identies the location of selected changes to this classication. For the convenience of the user, Committee D20 has highlighted those changes that may impact the use of this classication. This section may also include descriptions of the changes or reasons for the changes, or both. D 4181 – 97: (1) Deleted recycle grades in Class 5, 6, 7, and 8 in Groups 1 and 2 and Class 2 in Group 3. (2) Addressed use of acetal plastics that are recycled, reconstituted, recycled-regrind, recovered, or reprocessed, or combination thereof, in Scope and Inspection and Certication sections. (3) Added Guide D 5033 to Referenced Documents. D 4181 – 98: (1) Include Natural and Black colors to satisfy users of the classication. (2) Update property values on high volume products to reect a large data base (reference Footnote H). (3) Add lled and reinforced grades. (4) Delete group 1, class 2 materials, since they are no longer commercially available. (5) Delete group 2, class 3, grade 5, since the grade cannot be identied as a commercial material. (6) Add the current Table POM from D 4181 – 97 to the Appendix as Table X3.1 for reference. (7) Add ISO 3167, Plastics-Multipurpose test specimens to the referenced documents. (8) Insert new section 9.1 and renumber old 9.1 to 9.2 to detail injection molded test specimens as source of test pieces. (9) Revise footnotes to Tables POM, A and B to refer to specimen preparation section 9.1 for source of test pieces. D 4181 – 00: (1) Updated injection molding conditions in Table 1.
--`-`-`,,`,,`,`,,`---

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