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ASTM D788-14

(Classification)

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

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

ABSTRACT
The purpose of this classification system is to provide a method of adequately identifying poly(methyl methacrylate) (PMMA) 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. Poly(methyl methacrylate) molding and extrusion compounds are classified into groups in accordance with their composition. These groups are subdivided into classes and grades: class 1, 2, 3, and 4; grade 1 - materials used where special ultraviolet transmission, filtering, or stabilization characteristics are not required, grade 2 - materials used for those specialized applications in which the greatest amount of transmission of UV light is required, and grade 3 - materials (transparent UV stabilized or transparent UV absorbing) used when either special resistance to slight color change over long exposure times or high-intensity UV radiation is required, or when the material is required to filter out ultraviolet light. The plastics composition shall be uniform and shall conform to the requirements specified.
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 D4000. 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. Other requirements necessary to identify particular characteristics important to specific applications 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 extend to the evaluation of nonvirgin materials, the user must 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 reground 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 1: This 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 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.

General Information

Status
Historical
Publication Date
31-Jul-2014
ICS
83.140.99 - Other rubber and plastics products
Technical Committee
D20 - Plastics
Drafting Committee
D20.15 - Thermoplastic Materials
Current Stage
Ref Project

Relations

Replaces
ASTM D788-12 - Standard Classification System for Poly(Methyl Methacrylate) (PMMA) Molding and Extrusion Compounds
Effective Date
01-Aug-2014
Replaced By
ASTM D788-16 - Standard Classification System for Poly(Methyl Methacrylate) (PMMA) Molding and Extrusion Compounds
Effective Date
01-Sep-2016
Referred By
ASTM D955-21 - Standard Test Method of Measuring Shrinkage from Mold Dimensions of Thermoplastics
Effective Date
01-Aug-2014
Referred By
ASTM F3087-15 - Standard Specification for Acrylic Molding Resins for Medical Implant Applications
Effective Date
01-Aug-2014
Referred By
ASTM D4000-23 - Standard Classification System for Specifying Plastic Materials
Effective Date
01-Aug-2014

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ASTM D788-14 - Standard Classification System for Poly(Methyl Methacrylate) (PMMA) Molding and Extrusion CompoundsASTM D788-14 - Standard Classification System for Poly(Methyl Methacrylate) (PMMA) Molding and Extrusion Compounds
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Standards Content (Sample)

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:D788 −14
StandardClassification System for
Poly(Methyl Methacrylate) (PMMA) Molding and Extrusion
1
Compounds
This standard is issued under the fixed designation D788; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
This standard has been approved for use by agencies of the U.S. Department of Defense.
1. Scope* 1.5 This classification system and subsequent line callout
(specification) are not intended for the selection of materials,
1.1 The purpose of this classification system is to provide a
but only as a means to call out plastic materials to be used for
method of adequately identifying PMMA materials using a
the manufacture of parts. The selection of these materials is to
system consistent with that of Classification System D4000.It
be made by personnel with expertise in the plastics field in
further provides a means for specifying these materials by the
which the environment, inherent properties of the materials,
use of a simple line callout designation.
performance of the parts, part design, manufacturing process,
1.2 Thisclassificationsystemcoverspoly(methylmethacry-
and economics are considered.
late) molding and extrusion compounds.These compounds are
NOTE 1—This classification system is similar to ISO 8257-1:1987 in
polymers based on methyl methacrylate, and at least 70% of
title only. The technical content is significantly different.
the polymer shall be polymerized from methyl methacrylate.
1.6 The values stated in SI units are to be regarded as
1.3 The properties in this classification system are those
standard.
required to identify the compositions covered. Other require-
1.7 This standard does not purport to address all of the
ments necessary to identify particular characteristics important
safety concerns, if any, associated with its use. It is the
to specific applications shall be described by using the suffixes
responsibility of the user of this standard to establish appro-
as given in Section 5.
priate safety and health practices and determine the applica-
1.4 Acrylic molding and extrusion compounds are used
bility of regulatory limitations prior to use.
frequentlyinapplicationswhereextremeclarityandtheability
to retain that clarity and color under severe weathering and
2. Referenced Documents
other environmental exposures are of primary significance.
2
2.1 ASTM Standards:
While the test specimen properties of this document extend to
D149Test Method for Dielectric Breakdown Voltage and
the evaluation of nonvirgin materials, the user must take
DielectricStrengthofSolidElectricalInsulatingMaterials
precautionstoensurethatpartsmadefromthesematerialsmeet
at Commercial Power Frequencies
the desired end-use requirements. Accordingly, this specifica-
D150Test Methods forAC Loss Characteristics and Permit-
tionallowsfortheuseofthoseacrylicplasticmaterialsthatcan
tivity (Dielectric Constant) of Solid Electrical Insulation
be recycled, reconstituted, and reground provided the follow-
D257Test Methods for DC Resistance or Conductance of
ing:
Insulating Materials
1.4.1 The requirements as stated in this specification are
D618Practice for Conditioning Plastics for Testing
met,
D883Terminology Relating to Plastics
1.4.2 Thematerialhasnotbeenmodifiedinanywaytoalter
D1003Test Method for Haze and Luminous Transmittance
its conformance to food contact regulations or similar
of Transparent Plastics
requirements, and
D1238Test Method for Melt Flow Rates of Thermoplastics
1.4.3 Therequirementsoftheparticularend-useapplication
by Extrusion Plastometer
are met.
D1600TerminologyforAbbreviatedTermsRelatingtoPlas-
tics
1
ThisclassificationsystemisunderthejurisdictionofASTMCommitteeD20on
Plastics and is the direct responsibility of Subcommittee D20.15 on Thermoplastic
2
Materials. For referenced ASTM standards, visit the ASTM website, www.astm.org, or
Current edition approved Aug. 1, 2014. Published September 2014. Originally contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
approved in 1944. Last previous edition approved in 2012 as D788–12. DOI: Standards volume information, refer to the standard’s Document Summary page on
10.1520/D0788–14. 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
1

---------------------- Page: 1 ----------------------
D788−14
TABLE 1 Transmission of Grade 2 Materials at Various TABLE 2 Electrical Properties of Unmodified PMMA
A,B
Wavelengths
Test
Property Requirement
Wavelength, nm Transmission, min, % Method
...

This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation: D788 − 12 D788 − 14
Standard Classification System for
Poly(Methyl Methacrylate) (PMMA) Molding and Extrusion
1
Compounds
This standard is issued under the fixed designation D788; 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 (´) indicates an editorial change since the last revision or reapproval.
This standard has been approved for use by agencies of the U.S. Department of Defense.
1. Scope 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 D4000. 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. Other requirements
necessary to identify particular characteristics important to specific applications 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 extend to the evaluation of nonvirgin materials, the user must 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 reground 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 1—This 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 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.
2. Referenced Documents
2
2.1 ASTM Standards:
D149 Test Method for Dielectric Breakdown Voltage and Dielectric Strength of Solid Electrical Insulating Materials at
Commercial Power Frequencies
D150 Test Methods for AC Loss Characteristics and Permittivity (Dielectric Constant) of Solid Electrical Insulation
1
This classification system is under the jurisdiction of ASTM Committee D20 on Plastics and is the direct responsibility of Subcommittee D20.15 on Thermoplastic
Materials.
Current edition approved Aug. 1, 2012Aug. 1, 2014. Published September 2012September 2014. Originally approved in 1944. Last previous edition approved in 2012 as
D788D788 – 12. - 11. DOI: 10.1520/D0788-12.10.1520/D0788–14.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM Standards
volume information, refer to the standard’s Document Summary page on 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
1

---------------------- Page: 1 ----------------------
D788 − 14
TABLE 1 Transmission of Grade 2 Materials at Various
A,B
Wavelengths
Wavelength, nm Transmission, min, %
400 86
340 85
310 70
290 50
280 26
270 1
...

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SIGNIFICANCE AND USE
5.1 Molding and extruding plastic pellets require dust free, dry pellets to prevent processing problems. Plastic producers try to remove the dust and streamers with dust removal systems prior to packaging and loading. How to accurately measure dust and streamer content in plastic pellets is an important quality control issue.  
5.2 Particle size analysis is used to determine a percentage of particle size distribution from a representative sample of the whole. In terms of size analysis concerning plastic pellets, sieving is used to determine the dust content in the range of 500 to 2000 micron. Test Method D1921, Test Method B, is used to determine this type of particle sizing.  
5.3 After dry sieve analysis, particles smaller than 500 microns need to be analyzed by wet method. A fresh sample shall be used for wet analysis. This test method allows washing down the fines attached to the pellets by electrostatic forces.  
5.4 The wet analysis provides accurate quantification of small to large amounts of fines, negating static effects, and eliminating detrimental effects of mechanical agitation. A wet analysis must be employed to accurately quantify lower PPM dust levels in plastic pellets.
SCOPE
1.1 This test method measures the amount of fine particles adhered on plastic pellets or granules in which they are commonly produced and supplied. The lower limit of this test method is restricted only by the porosity of the filter disc used to capture the particle size being quantified.  
1.2 The wet analysis technique allows for separation and collection of statically charged particles by liquid wash and filtration methods. This must be performed under standard laboratory conditions.  
1.3 The values stated in SI units are to be regarded as standard.  
1.4 This test method describes an essential practice to check the quality of plastics once the production cycle is terminated and to evaluate the performance of pellet cleaning systems or of the special pneumatic conveying systems for the distinct size fractions below 500 micron only.  
1.5 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use.
Note 1: There is no known ISO equivalent to this standard.  
1.6 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

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ASTM
ASTM D5336-22(Specification)
Standard Classification System and Basis for Specification for Polyphthalamide (PPA) Injection Molding Materials

ABSTRACT
This specification covers the classification, testing, and requirements of polyphthalamide (PPA) materials, both virgin and recycled, suitable for injection molding. This specification is intended to be a means of calling out plastics materials used in the fabrication of end items or parts, and not for the selection of materials. The materials are classified into groups according to crystallinity, and are further subdivided into classes and grades as specified. Materials shall be sampled, prepared, and conditioned appropriately for testing, for which specimens shall conform to specified values of the following requirements: inherent viscosity; melting temperature; glass transition; tensile strength; flexural strength and modulus; Izod impact strength; deflection temperature; and moisture.
SCOPE
1.1 This classification system covers polyphthalamide (PPA) materials suitable for injection molding.  
1.2 The properties included in this classification system are those required to identify the compositions covered. Other requirements necessary to identify particular characteristics important to specialized applications are to be specified by using suffixes as given in Section 5.  
1.3 This classification system allows for the use of recycled materials provided that all specification requirements are met.  
1.4 This classification system is intended to be a means of calling out plastics materials used in the fabrication of end items or parts. It is not intended for the selection of materials. Material selection can be made by those having expertise in the plastics field only 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.  
1.5 The values stated in SI units are to be regarded as the standard (see IEEE/ASTM SI-10). The values given in parentheses are for information only.  
1.6 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use. Specific precautionary statements are given in 11.7.1.
Note 1: There is no known ISO equivalent to this standard. ISO 16396-1/-2 for polyamides may also be used to describe and classify these PPA materials, but the technical content is significantly different.
Note 2: ASTM Standard D6779 on polyamide materials also includes PPA materials in its coverage of various polyamide chemistries. This standard gives additional information for classification and specification for PPA compositions classified as Group 10 (PA6T/66), Group 12 (PA6T/6I/66) and Group 13 (PA6T/6I) in ASTM Standard D6779 and includes provisions for other PPA compositions to utilize the classification presented.  
1.7 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

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ASTM
ASTM D1562-22(Specification)
Standard Classification System and Basis for Specification for Cellulose Acetate Propionate Molding and Extrusion Compounds (CAP)

SCOPE
1.1 This classification system covers requirements for plasticized cellulose acetate propionate thermoplastic compounds suitable for injection molding and extrusion. These compounds have a propionyl content less than 48 % and an acetyl content less than 3 % and can contain dyes and pigments. Cellulosic plastic materials, being thermoplastic, are reprocessable and recyclable. This classification system allows for the use of those cellulosic materials, provided that all specific requirements of this classification system are met.  
1.2 The properties included in this classification system are those required to identify the compositions covered. Other requirements necessary to identify particular characteristics important to specialized applications are 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 can be made by those having expertise in the plastic field only after careful consideration of the design and performance required of the part, environment to which it will be exposed, fabrication process to be employed, costs involved, and 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 standard.  
1.5 The following safety hazards caveat pertains only to the test method 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use.
Note 1: There is no known ISO equivalent to this standard.  
1.6 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

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ASTM
ASTM D3294-22(Specification)
Standard Specification for Polytetrafluoroethylene (PTFE) Resin Molded Sheet and Molded Basic Shapes

ABSTRACT
This specification establishes the requirements and test methods for the material, dimensions, and workmanship, and the physical and electrical properties of molded sheet manufactured from polytetrafluoroethylene (PTFE) resin molding materials and molded basic shapes made from resin molding and extrusion materials. The sheet or molded basic shape shall be made from unpigmented PTFE and shall be free from foreign matters. Each of the samples shall undergo visual and dimensional inspection to verify their compliance with the standard requirements. The specimens shall conform to the following physical and electrical property requirements: tensile strength; elongation; dielectric strength; specific gravity; porosity; and melting point. Examination for internal defects shall also be conducted to ensure that the specimens are free from microscopic cracks, voids, inclusions, and other surface defects that might affect the serviceability of the materials.
SCOPE
1.1 This specification establishes requirements and methods of test for the material, dimensions, and workmanship, and the physical and electrical properties of molded sheet in minimum thicknesses of 0.794 mm (1/32 in.) manufactured from PTFE resin molding materials defined in Specification D4894.  
1.2 This specification also establishes requirements for molded basic shapes made from molding materials. This specification is for products 300 mm (12 in.) or less in a dimension parallel to and 12.7 mm (0.5 in.) or greater in the dimension perpendicular to the direction of the applied molding pressure.  
1.3 The values stated in SI units are to be regarded as the standard.  
1.4 The following precautionary caveat pertains only to the test method portion, Section 7, of this specification. 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use. Special attention is called to 13.2, 13.3, 13.6, 13.8, and A1.  
Note 1: There is no known ISO equivalent to this standard.  
1.5 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

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