Standard Classification System for
Nylon Injection and Extrusion Materials (PA)1

This standard is issued under the fixed designation D 4066; 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 system covers nylon materials suitable for injection molding and extrusion. Some of these
compositions are also suitable for compression molding and
application from solution.

1.2 The properties included in this classification system 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 system and subsequent line call-out
(specification) 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
plastic field 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 system.

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 methods portion, Section 11, of this classification system.
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 system is similar to ISO 1874-1/-2 1993,
although the technical content is significantly different.
NOTE 2—This classification system is being revised to include international 4-mm specimens and test procedures as the standard for compliance. The 3.2-mm specimens; test methods; and Tables PA, A, and B are
included in Appendix X3 as a reference for those wishing to use them. It
is recommended that the material manufacturer be consulted on all

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