Standard Classification for
Acetal (POM) Molding and Extrusion Materials1

This standard is issued under the fixed 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 classification covers acetal materials suitable for
molding and extrusion. This specification 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
specification 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 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 limitations prior to use.
NOTE 1—This classification is similar to ISO 9988-1 and 9988-2,
although the technical content is significantly different.
NOTE 2—This classification was revised in 1992 to include interna

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