Standard Classification System for Poly(Methyl Methacrylate) (PMMA) Molding and Extrusion Compounds

SCOPE
1.1 The purpose of this classification system is to provide a method of adequately identifying PMMA materials using a system consistent with that of Classification System D 4000. It further provides a means for specifying these materials by the use of a simple line callout designation.
1.2 This classification system covers poly(methyl methacrylate) molding and extrusion compounds. These compounds are polymers based on methyl methacrylate, and at least 70 % of the polymer shall be polymerized from methyl methacrylate.
1.3 The properties in this classification system are those required to identify the compositions covered. There may be other requirements necessary to identify particular characteristics important to specific applications. These shall be described by using the suffixes as given in Section 5.
1.4 Acrylic molding and extrusion compounds are used frequently in applications where extreme clarity and the ability to retain that clarity and color under severe weathering and other environmental exposures are of primary significance. While the test specimen properties of this document may be used to evaluate nonvirgin materials, the user should take precautions to ensure that parts made from these materials meet the desired end-use requirements. Accordingly, this specification allows for the use of those acrylic plastic materials that can be recycled, reconstituted, and regrounded provided the following:
1.4.1 The requirements as stated in this specification are met,
1.4.2 The material has not been modified in any way to alter its conformance to food contact regulations or similar requirements, and
1.4.3 The requirements of the particular end-use application are met.
1.5 This classification system and subsequent line callout (specification) are not intended for the selection of materials, but only as a means to call out plastic materials to be used for the manufacture of parts. The selection of these materials is to be made by personnel with expertise in the plastics field in which the environment, inherent properties of the materials, performance of the parts, part design, manufacturing process, and economics are considered.
Note 1This classification system is similar to ISO 8257-1:1987 in title only. The technical content is significantly different.
1.6 The values stated in SI units are to be regarded as the standard.
1.7 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.

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ASTM D788-04 - Standard Classification System for Poly(Methyl Methacrylate) (PMMA) Molding and Extrusion Compounds
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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation: D 788 – 04
Standard Classification System for
Poly(Methyl Methacrylate) (PMMA) Molding and Extrusion
1
Compounds
This standard is issued under the fixed designation D 788; 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* be made by personnel with expertise in the plastics field in
which the environment, inherent properties of the materials,
1.1 The purpose of this classification system is to provide a
performance of the parts, part design, manufacturing process,
method of adequately identifying PMMA materials using a
and economics are considered.
system consistent with that of Classification System D 4000. It
further provides a means for specifying these materials by the
NOTE 1—This classification system is similar to ISO 8257-1:1987 in
use of a simple line callout designation.
title only. The technical content is significantly different.
1.2 Thisclassificationsystemcoverspoly(methylmethacry-
1.6 The values stated in SI units are to be regarded as the
late) molding and extrusion compounds. These compounds are
standard.
polymers based on methyl methacrylate, and at least 70 % of
1.7 This standard does not purport to address all of the
the polymer shall be polymerized from methyl methacrylate.
safety concerns, if any, associated with its use. It is the
1.3 The properties in this classification system are those
responsibility of the user of this standard to establish appro-
required to identify the compositions covered. There may be
priate safety and health practices and determine the applica-
other requirements necessary to identify particular character-
bility of regulatory limitations prior to use.
istics important to specific applications. These shall be de-
scribed by using the suffixes as given in Section 5. 2. Referenced Documents
1.4 Acrylic molding and extrusion compounds are used 2
2.1 ASTM Standards:
frequently in applications where extreme clarity and the ability
D 149 Test Method for Dielectric Breakdown Voltage and
to retain that clarity and color under severe weathering and
Dielectric Strength of Solid Electrical Insulating Materials
other environmental exposures are of primary significance.
at Commercial Power Frequencies
While the test specimen properties of this document may be
D 150 Test Methods for AC Loss Characteristics and Per-
used to evaluate nonvirgin materials, the user should take
mittivity (Dielectric Constant) of Solid Electrical Insula-
precautionstoensurethatpartsmadefromthesematerialsmeet
tion
the desired end-use requirements. Accordingly, this specifica-
D 257 Test Methods for DC Resistance or Conductance of
tionallowsfortheuseofthoseacrylicplasticmaterialsthatcan
Insulating Materials
be recycled, reconstituted, and regrounded provided the fol-
D 542 Test Methods for Index of Refraction of Transparent
lowing:
Organic Plastics
1.4.1 The requirements as stated in this specification are
D 618 Practice for Conditioning Plastics for Testing
met,
D 638 Test Method for Tensile Properties of Plastics
1.4.2 The material has not been modified in any way to alter
D 790 TestMethodsforFlexuralPropertiesofUnreinforced
its conformance to food contact regulations or similar require-
and Reinforced Plastics and Electrical Insulating Materials
ments, and
D 883 Terminology Relating to Plastics
1.4.3 The requirements of the particular end-use application
D 1003 Test Method for Haze and Luminous Transmittance
are met.
of Transparent Plastics
1.5 This classification system and subsequent line callout
D 1238 Test Method for Flow Rates of Thermoplastics by
(specification) are not intended for the selection of materials,
Extrusion Plastometer
but only as a means to call out plastic materials to be used for
D 1525 Test Method for Vicat Softening Temperature of
the manufacture of parts. The selection of these materials is to
Plastics
1
ThisclassificationsystemisunderthejurisdictionofASTMCommitteeD20on
2
Plastics and is the direct responsibility of Subcommittee D20.15 on Thermoplastic For referenced ASTM standards, visit the ASTM website, www.astm.org, or
Materials (Section D20.15.02). contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
Current edition approved February 1, 2004. Published March 2004. Originally Standards volume information, refer to the standard’s Document Summary page on
approved in 1944. Last previous edition approved in 2003 as D 788 - 03. the ASTM website.
*A Summary of Changes section appears at the end of this standard.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
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