ASTM D3641-10a

Standard Practice for Injection Molding Test Specimens of Thermoplastic Molding and Extrusion Materials

SIGNIFICANCE AND USE
It is well known that plastic test specimens molded under different conditions can have significantly different properties. This practice is designed to minimize those differences by establishing operating protocols without being unnecessarily restrictive.
Always refer to the ASTM material specification or ISO designation for the material for recommended molding conditions. If not available, consult the material supplier.
This practice requires the use of adequate quantities of plastic material to find desirable operating conditions and to make the desired test specimens.
SCOPE
1.1 This practice covers the general principles to be followed when injection molding test specimens of thermoplastic molding and extrusion materials. This practice is to be used to obtain uniformity in methods of describing the various steps of the injection molding process and to set up uniform methods of reporting these conditions. The exact conditions required to prepare suitable specimens will vary for each plastic material. Those conditions should become a part of the specification for the material, or be agreed upon between the purchaser and the supplier. Any requirements or recommendations in the material specification which differ from this standard take precedence over those in this standard.
1.2 The methodology presented assumes the use of reciprocating screw injection molding machines.  
1.3 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.  
1.4 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 practice is equivalent to the following parts of ISO 294: PlasticsInjection Moulding of Test Specimens of Thermoplastic Materials; 294-1: Part 1General Principles and Multipurpose Test Specimens (ISO Type A Mould) and Bars (ISO Type B Mould); ISO 294-2: Part 2Small Tensile Bars (ISO Type C Mould); ISO 294-3: Part 3Plates (ISO Type D Moulds).

General Information

• Status: Historical
• Publication Date: 31-Oct-2010
• ICS: 83.080.20 - Thermoplastic materials
• Technical Committee: D20 - Plastics
• Drafting Committee: D20.09 - Specimen Preparation

Relations

• Replaces: ASTM D3641-10 - Standard Practice for Injection Molding Test Specimens of Thermoplastic Molding and Extrusion Materials
• Effective Date: 01-Nov-2010
• Replaced By: ASTM D3641-12 - Standard Practice for Injection Molding Test Specimens of Thermoplastic Molding and Extrusion Materials
• Effective Date: 15-Apr-2012
• Referred By: ASTM D4203-17 - Standard Specification for and Basis for Specifications for Styrene-Acrylonitrile (SAN) Injection and Extrusion Materials
• Effective Date: 01-Nov-2010
• Referred By: ASTM D5204-22 - Standard Classification System and Basis for Specification for Polyamide-Imide (PAI) Molding and Extrusion Materials
• Effective Date: 01-Nov-2010
• Referred By: ASTM D5592-94(2018) - Standard Guide for Material Properties Needed in Engineering Design Using Plastics
• Effective Date: 01-Nov-2010
• Referred By: ASTM D3419-12(2019) - Standard Practice for In-Line Screw-Injection Molding Test Specimens From Thermosetting Compounds
• Effective Date: 01-Nov-2010
• Referred By: ASTM D955-21 - Standard Test Method of Measuring Shrinkage from Mold Dimensions of Thermoplastics
• Effective Date: 01-Nov-2010
• Referred By: ASTM D3012-19 - Standard Test Method for Thermal-Oxidative Stability of Polypropylene Using a Specimen Rotator Within an Oven
• Effective Date: 01-Nov-2010
• Referred By: ASTM D788-16 - Standard Classification System for Poly(Methyl Methacrylate) (PMMA) Molding and Extrusion Compounds
• Effective Date: 01-Nov-2010
• Referred By: ASTM D8156-18 - Standard Classification System for and Basis of Specifications for Thermoplastic Elastomer Copolyester Molding and Extrusion Materials (TPC)
• Effective Date: 01-Nov-2010
• Referred By: ASTM D3965-21 - Standard Classification System and Basis for Specifications for Rigid Acrylonitrile-Butadiene-Styrene (ABS) Materials for Pipe and Fittings
• Effective Date: 01-Nov-2010
• Referred By: ASTM D4101-17e1 - Standard Classification System and Basis for Specification for Polypropylene Injection and Extrusion Materials
• Effective Date: 01-Nov-2010
• Referred By: ASTM D4066-13(2019) - Standard Classification System for Nylon Injection and Extrusion Materials (PA)
• Effective Date: 01-Nov-2010
• Referred By: ASTM D5138-23 - Standard Classification System and Basis for Specification for Liquid Crystal Polymers Molding and Extrusion Materials (LCP)
• Effective Date: 01-Nov-2010
• Referred By: ASTM D256-23e1 - Standard Test Methods for Determining the Izod Pendulum Impact Resistance of Plastics
• Effective Date: 01-Nov-2010

Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Please contact ASTM International (www.astm.org) for the latest information.
Designation:D3641–10a
Standard Practice for
Injection Molding Test Specimens of Thermoplastic Molding
1
and Extrusion Materials
This standard is issued under the fixed designation D3641; 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* D570 Test Method for Water Absorption of Plastics
D638 Test Method for Tensile Properties of Plastics
1.1 This practice covers the general principles to be fol-
D648 Test Method for Deflection Temperature of Plastics
lowed when injection molding test specimens of thermoplastic
Under Flexural Load in the Edgewise Position
molding and extrusion materials. This practice is to be used to
D790 Test Methods for Flexural Properties of Unreinforced
obtain uniformity in methods of describing the various steps of
and Reinforced Plastics and Electrical Insulating Materials
theinjectionmoldingprocessandtosetupuniformmethodsof
D883 Terminology Relating to Plastics
reporting these conditions. The exact conditions required to
D955 Test Method of Measuring Shrinkage from Mold
prepare suitable specimens will vary for each plastic material.
Dimensions of Thermoplastics
Those conditions shall become a part of the specification for
D957 Practice for Determining Surface Temperature of
the material, or be agreed upon between the purchaser and the
Molds for Plastics
supplier.Anyrequirementsorrecommendationsinthe material
3
2.2 ISO Standards:
specification which differ from this standard take precedence
ISO 3167 Plastics—Preparation and Use of Multipurpose
over those in this standard.
Test Specimens
1.2 The methodology presented assumes the use of recipro-
ISO294-1: Plastics—InjectionMouldingofTestSpecimens
cating screw injection molding machines.
of Thermoplastic Materials—Part 1: General Principles
1.3 The values stated in SI units are to be regarded as the
and Multipurpose Test Specimens (ISO Type A Mould)
standard. The values given in parentheses are for information
and Bars (ISO Type B Mould)
only.
ISO294-2: Plastics—InjectionMouldingofTestSpecimens
1.4 This standard does not purport to address all of the
of Thermoplastic Materials—Part 2: Small Tensile Bars
safety concerns, if any, associated with its use. It is the
(ISO Type C Mould)
responsibility of the user of this standard to establish appro-
ISO294-3: Plastics—InjectionMouldingofTestSpecimens
priate safety and health practices and determine the applica-
of Thermoplastic Materials—Part 3: Plates (ISO Type D
bility of regulatory limitations prior to use.
Moulds)
NOTE 1—This practice is equivalent to the following parts of ISO 294:
Plastics—Injection Moulding of Test Specimens of Thermoplastic Mate-
3. Terminology
rials; 294-1: Part 1—General Principles and MultipurposeTest Specimens
3.1 Definitions—Definitions of terms applying to this prac-
(ISO Type A Mould) and Bars (ISO Type B Mould); ISO 294-2: Part
tice appear in Terminology D883.
2—Small Tensile Bars (ISO Type C Mould); ISO 294-3: Part 3—Plates
3.2 Definitions of Terms Specific to This Standard:
(ISO Type D Moulds).
3.2.1 average injection velocity, n—the mean value of the
2. Referenced Documents
velocity of the molten plastic flow front within a cavity during
2
2.1 ASTM Standards: the injection time that is calculated from the shot volume and
D256 Test Methods for Determining the Izod Pendulum injection time. (See Terminology D883.)
Impact Resistance of Plastics 3.2.1.1 Discussion—The average injection velocity is cal-
culated as follows:
V
s
V 5
av
1
T 3 A 3 n
ThispracticeisunderthejurisdictionofASTMCommitteeD20onPlasticsand i c
is the direct responsibility of Subcommittee D20.09 on Specimen Preparation.
where:
Current edition approved Nov. 1, 2010. Published January 2011. Originally
approved 1991. Last previous edition approved 2010 as D3641 – 10. DOI: 10.1520/
V = average injection velocity, mm/s,
av
D3641-10A.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
3
Standards volume information, refer to the standard’s Document Summary page on Available fromAmerican National Standards Institute (ANSI), 25 W. 43rd St.,
the ASTM website. 4th Floor, New York, NY 10036, http://www.ansi.org.
*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

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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Please contact ASTM International (www.astm.org) fo
...

This document is not anASTM standard and is intended only to provide the user of anASTM 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:D3641–10 Designation:D3641–10a
Standard Practice for
Injection Molding Test Specimens of Thermoplastic Molding
1
and Extrusion Materials
This standard is issued under the fixed designation D3641; 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 practice covers the general principles to be followed when injection molding test specimens of thermoplastic molding
and extrusion materials. This practice is to be used to obtain uniformity in methods of describing the various steps of the injection
molding process and to set up uniform methods of reporting these conditions. The exact conditions required to prepare suitable
specimens will vary for each plastic material. Those conditions shouldshall become a part of the specification for the material, or
be agreed upon between the purchaser and the supplier.Any requirements or recommendations in the material specification which
differ from this standard take precedence over those in this standard.
1.2 The methodology presented assumes the use of reciprocating screw injection molding machines.
1.3 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.
1.4 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 practice is equivalent to the following parts of ISO 294: Plastics—Injection Moulding of Test Specimens of Thermoplastic Materials;
294-1: Part 1—General Principles and Multipurpose Test Specimens (ISO Type A Mould) and Bars (ISO Type B Mould); ISO 294-2: Part 2—Small
Tensile Bars (ISO Type C Mould); ISO 294-3: Part 3—Plates (ISO Type D Moulds).
2. Referenced Documents
2
2.1 ASTM Standards:
D256 Test Methods for Determining the Izod Pendulum Impact Resistance of Plastics
D570 Test Method for Water Absorption of Plastics
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
D955 Test Method of Measuring Shrinkage from Mold Dimensions of Thermoplastics
D957 Practice for Determining Surface Temperature of Molds for Plastics
3
2.2 ISO Standards:
ISO 3167 Plastics—Preparation and Use of Multipurpose Test Specimens
ISO 294-1: Plastics—Injection Moulding of Test Specimens of Thermoplastic Materials—Part 1: General Principles and
Multipurpose Test Specimens (ISO Type A Mould) and Bars (ISO Type B Mould)
ISO 294-2: Plastics—Injection Moulding ofTest Specimens ofThermoplastic Materials—Part 2: SmallTensile Bars (ISOType
C Mould)
ISO 294-3: Plastics—Injection Moulding of Test Specimens of Thermoplastic Materials—Part 3: Plates (ISO Type D Moulds)
3. Terminology
3.1 Definitions—Definitions of terms applying to this practice appear in Terminology D883.
3.2 Definitions of Terms Specific to This Standard:
3.2.1 average injection velocity, n—the mean value of the velocity of the molten plastic flow front within a cavity during the
1
This practice is under the jurisdiction of ASTM Committee D20 on Plastics and is the direct responsibility of Subcommittee D20.09 on Specimen Preparation.
Current edition approved Aug.Nov. 1, 2010. Published September 2010.January 2011. Originally approved 1991. Last previous edition approved 20022010 as
D3641 – 102. DOI: 10.1520/D3641-10A.
2
For referencedASTM standards, visit theASTM website, www.astm.org, or contactASTM Customer Service at [e-mail]. For Annual Book of ASTM Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
3
Available from American National Standards Institute (ANSI), 25 W. 43rd St., 4th Floor, New York, NY 10036, http://www.ansi.org.
*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

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D3641–10a
injection time that is calculated from t
...