ASTM D5138-23

Standard Classification System and Basis for Specification for Liquid Crystal Polymers Molding and Extrusion Materials (LCP)

SCOPE
1.1 This classification system covers liquid crystal polymeric (LCP) materials suitable for injection molding and extrusion. This classification system allows the use of liquid crystal polymers that are recycled, reconstituted, recycled-regrind, recovered, or reprocessed, or a combination thereof, provided that the requirements as stated in this classification system are met. It is the responsibility of the supplier and the buyer of liquid crystal polymers that are recycled, reconstituted, recycled-regrind, recovered, or reprocessed, or a combination thereof, to ensure compliance.  
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 allowed. These shall be agreed upon between the user and the supplier, by using suffixes as given in Section 5.  
1.3 This classification system and subsequent line callout (specification) are intended to be a means of calling out plastic materials used in the fabrication of end-use 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 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 standard.  
1.5 The following precautionary 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.

General Information

• Status: Published
• Publication Date: 31-Jan-2023
• ICS: 31.120 - Electronic display devices
• Technical Committee: D20 - Plastics
• Drafting Committee: D20.15 - Thermoplastic Materials

Standards Content (Sample)

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.
Designation: D5138 − 23
Standard Classification System and Basis for Specification for
Liquid Crystal Polymers Molding and Extrusion Materials
1
(LCP)
This standard is issued under the fixed designation D5138; 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.
1. Scope* health, and environmental practices and determine the appli-
cability of regulatory limitations prior to use.
1.1 This classification system covers liquid crystal poly-
meric (LCP) materials suitable for injection molding and
NOTE 1—There is no known ISO equivalent to this standard.
extrusion. This classification system allows the use of liquid
1.6 This international standard was developed in accor-
crystal polymers that are recycled, reconstituted, recycled-
dance with internationally recognized principles on standard-
regrind, recovered, or reprocessed, or a combination thereof,
ization established in the Decision on Principles for the
provided that the requirements as stated in this classification
Development of International Standards, Guides and Recom-
system are met. It is the responsibility of the supplier and the
mendations issued by the World Trade Organization Technical
buyer of liquid crystal polymers that are recycled,
Barriers to Trade (TBT) Committee.
reconstituted, recycled-regrind, recovered, or reprocessed, or a
combination thereof, to ensure compliance.
2. Referenced Documents
2
1.2 The properties included in this classification system are
2.1 ASTM Standards:
those required to identify the compositions covered. Other
D256 Test Methods for Determining the Izod Pendulum
requirements necessary to identify particular characteristics
Impact Resistance of Plastics
important to specialized applications are allowed. These shall
D618 Practice for Conditioning Plastics for Testing
be agreed upon between the user and the supplier, by using
D638 Test Method for Tensile Properties of Plastics
suffixes as given in Section 5.
D648 Test Method for Deflection Temperature of Plastics
Under Flexural Load in the Edgewise Position
1.3 This classification system and subsequent line callout
D790 Test Methods for Flexural Properties of Unreinforced
(specification) are intended to be a means of calling out plastic
and Reinforced Plastics and Electrical Insulating Materi-
materials used in the fabrication of end-use items or parts. It is
als
not intended for the selection of materials. Material selection
D883 Terminology Relating to Plastics
can be made by those having expertise in the plastics field after
D1238 Test Method for Melt Flow Rates of Thermoplastics
careful consideration of the design and the performance
by Extrusion Plastometer
required of the part, the environment to which it will be
D1600 Terminology for Abbreviated Terms Relating to Plas-
exposed, the fabrication process to be employed, the costs
tics
involved, and the inherent properties of the material other than
D3418 Test Method for Transition Temperatures and Enthal-
those covered by this classification system.
pies of Fusion and Crystallization of Polymers by Differ-
1.4 The values stated in SI units are to be regarded as
ential Scanning Calorimetry
standard.
D3641 Practice for Injection Molding Test Specimens of
1.5 The following precautionary caveat pertains only to the
Thermoplastic Molding and Extrusion Materials
test method portion, Section 11, of this classification system:
D3835 Test Method for Determination of Properties of
This standard does not purport to address all of the safety
Polymeric Materials by Means of a Capillary Rheometer
concerns, if any, associated with its use. It is the responsibility
D3892 Practice for Packaging/Packing of Plastics
of the user of this standard to establish appropriate safety,
D4000 Classification System for Specifying Plastic Materi-
als
D5630 Test Method for Ash Content in Plastics
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
2
Materials. For referenced ASTM standards, visit the ASTM website, www.astm.org, or
Current edition approved Feb. 1, 2023. Published February 2023. Originally contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
approved in 1990. Last previous edition approved in 2016 as D5138 - 16. DOI: Standards volume information, refer to the standard’s Document Summary page on
10.1520/D5138-23. the ASTM website.
*A Summary of Changes sectio
...

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: D5138 − 16 D5138 − 23
Standard Classification System and Basis for Specification for
Liquid Crystal Polymers Molding and Extrusion Materials
1
(LCP)
This standard is issued under the fixed designation D5138; 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.
1. Scope*
1.1 This classification system covers liquid crystal polymeric (LCP) materials suitable for injection molding and extrusion. This
classification system allows the use of liquid crystal polymers that are recycled, reconstituted, recycled-regrind, recovered, or
reprocessed, or a combination thereof, provided that the requirements as stated in this classification system are met. It is the
responsibility of the supplier and the buyer of liquid crystal polymers that are recycled, reconstituted, recycled-regrind, recovered,
or reprocessed, or a combination thereof, to ensure compliance.
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 allowed. These shall be
agreed upon between the user and the supplier, by using suffixes as given in Section 5.
1.3 This classification system and subsequent line callout (specification) are intended to be a means of calling out plastic materials
used in the fabrication of end-use 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 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 standard.
1.5 The following precautionary 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 and healthsafety, 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.
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 April 1, 2016Feb. 1, 2023. Published April 2016February 2023. Originally approved in 1990. Last previous edition approved in 20112016 as
D5138 - 11.D5138 - 16. DOI: 10.1520/D5138-16.10.1520/D5138-23.
*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 ----------------------
D5138 − 23
2. Referenced Documents
2
2.1 ASTM Standards:
D256 Test Methods for Determining the Izod Pendulum Impact Resistance of Plastics
D618 Practice for Conditioning Plastics for Testing
D638 Test Method for Tensile Properties of Plastics
D648 Test Method for Deflection Temperature of Plastics Under Flexural Load in the Edgewise Position
D790 Test Methods for Flexural Properties of Unreinforced and Reinforced Plastics and Electrical Insulating Materials
D883 Terminology Relating to Plastics
D1238 Test Method for Melt Flow Rates of Thermoplastics by Extrusion Plastometer
D1600 Terminology for Abbreviated Terms Relating to Plastics
D3418 Test Method for Transition Temperatures and Enthalpies of Fusion and Crystallization of Polymers by Differential
Scanning Calorimetry
D3641 Practice for Injection Molding Test Specimens of Thermoplastic Molding and Extrusion Materials
D3835 Test Method for Determination of Properties of Polymeric Materials by Means of a Capillary Rh
...