ASTM D3641-12

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. 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: 14-Apr-2012
• ICS: 83.080.20 - Thermoplastic materials
• Technical Committee: D20 - Plastics
• Drafting Committee: D20.09 - Specimen Preparation

Relations

• Replaces: ASTM D3641-10a - Standard Practice for Injection Molding Test Specimens of Thermoplastic Molding and Extrusion Materials
• Effective Date: 15-Apr-2012
• Replaced By: ASTM D3641-14 - Standard Practice for Injection Molding Test Specimens of Thermoplastic Molding and Extrusion Materials
• Effective Date: 01-Mar-2014
• Referred By: ASTM D4067-23 - Standard Classification System and Basis for Specification for Reinforced and Filled Poly(Phenylene Sulfide) (PPS) Injection Molding and Extrusion Materials Using ASTM Methods
• Effective Date: 15-Apr-2012
• Referred By: ASTM D787-18 - Standard Specification for Ethyl Cellulose Molding and Extrusion Compounds
• Effective Date: 15-Apr-2012
• Referred By: ASTM D5138-23 - Standard Classification System and Basis for Specification for Liquid Crystal Polymers Molding and Extrusion Materials (LCP)
• Effective Date: 15-Apr-2012
• Referred By: ASTM D5336-22 - Standard Classification System and Basis for Specification for Polyphthalamide (PPA) Injection Molding Materials
• Effective Date: 15-Apr-2012
• Referred By: ASTM D1562-22 - Standard Classification System and Basis for Specification for Cellulose Acetate Propionate Molding and Extrusion Compounds (CAP)
• Effective Date: 15-Apr-2012
• Referred By: ASTM D6339-11(2019) - Standard Classification System for and Basis for Specifications for Syndiotactic Polystyrene Molding and Extrusion (SPS)
• Effective Date: 15-Apr-2012
• Referred By: ASTM D5990-20a - Standard Classification System and Basis for Polyketone Injection Molding and Extrusion Materials (PK)
• Effective Date: 15-Apr-2012
• Referred By: ASTM F2617-15 - Standard Test Method for Identification and Quantification of Chromium, Bromine, Cadmium, Mercury, and Lead in Polymeric Material Using Energy Dispersive X-ray Spectrometry
• Effective Date: 15-Apr-2012
• Referred By: ASTM D788-16 - Standard Classification System for Poly(Methyl Methacrylate) (PMMA) Molding and Extrusion Compounds
• Effective Date: 15-Apr-2012
• Referred By: ASTM D706-20 - Standard Classification System and Basis for Specifications for Cellulose Acetate Molding and Extrusion Compounds (CA)
• Effective Date: 15-Apr-2012
• Referred By: ASTM D6394-21a - Standard Classification System for and Basis for Specification for Sulfone Plastics (SP)
• Effective Date: 15-Apr-2012
• Referred By: ASTM D3419-12(2019) - Standard Practice for In-Line Screw-Injection Molding Test Specimens From Thermosetting Compounds
• Effective Date: 15-Apr-2012
• Referred By: ASTM D6358-19e1 - Standard Classification System and Basis for Specification for Poly (Phenylene Sulfide) (PPS) Injection Molding, Extrusion and Blow Molding Materials Using ISO Methods
• Effective Date: 15-Apr-2012

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: D3641 − 12
StandardPractice 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* D638 Test Method for Tensile Properties of Plastics
D648 Test Method for Deflection Temperature of Plastics
1.1 This practice covers the general principles to be fol-
Under Flexural Load in the Edgewise Position
lowed when injection molding test specimens of thermoplastic
D790 Test Methods for Flexural Properties of Unreinforced
molding and extrusion materials. This practice is to be used to
and Reinforced Plastics and Electrical Insulating Materi-
obtain uniformity in methods of describing the various steps of
als
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
Any requirements or recommendations in the material specifi-
D957 Practice for Determining Surface Temperature of
cation which differ from this standard take precedence over
Molds for Plastics
those in this standard.
3
2.2 ISO Standards:
1.2 The methodology presented assumes the use of recipro-
ISO 3167 Plastics—Preparation and Use of Multipurpose
cating screw injection molding machines.
Test Specimens
1.3 The values stated in SI units are to be regarded as the
ISO 294-1: Plastics—Injection Moulding of Test Specimens
standard. The values given in parentheses are for information
of Thermoplastic Materials—Part 1: General Principles
only.
and Multipurpose Test Specimens (ISO Type A Mould)
1.4 This standard does not purport to address all of the and Bars (ISO Type B Mould)
safety concerns, if any, associated with its use. It is the
ISO 294-2: Plastics—Injection Moulding of Test Specimens
responsibility of the user of this standard to establish appro- of Thermoplastic Materials—Part 2: Small Tensile Bars
priate safety and health practices and determine the applica- (ISO Type C Mould)
bility of regulatory limitations prior to use.
ISO 294-3: Plastics—Injection Moulding of Test Specimens
of Thermoplastic Materials—Part 3: Plates (ISO Type D
NOTE 1—This practice is equivalent to the following parts of ISO 294:
Moulds)
Plastics—Injection Moulding of Test Specimens of Thermoplastic Mate-
rials; 294-1: Part 1—General Principles and MultipurposeTest Specimens
(ISO Type A Mould) and Bars (ISO Type B Mould); ISO 294-2: Part
3. Terminology
2—Small Tensile Bars (ISO Type C Mould); ISO 294-3: Part 3—Plates
(ISO Type D Moulds). 3.1 Definitions—Definitions of terms applying to this prac-
tice appear in Terminology D883.
2. Referenced Documents
3.2 Definitions of Terms Specific to This Standard:
2
2.1 ASTM Standards:
3.2.1 average injection velocity, n—the mean value of the
D256 Test Methods for Determining the Izod Pendulum
velocity of the molten plastic flow front within a cavity during
Impact Resistance of Plastics
the injection time that is calculated from the shot volume and
D570 Test Method for Water Absorption of Plastics
injection time. (See Terminology D883.)
3.2.1.1 Discussion—The average injection velocity is calcu-
1 lated as follows:
ThispracticeisunderthejurisdictionofASTMCommitteeD20onPlasticsand
is the direct responsibility of Subcommittee D20.09 on Specimen Preparation.
V
s
Current edition approved April 15, 2012. Published May 2012. Originally
V 5
av
T 3A 3n
approved 1991. Last previous edition approved 2010 as D3641 – 10A. DOI: i c
10.1520/D3641-12.
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

---------------------- Page: 1 ----------------------
D3641 − 12
where: 5.3 This practice requires the use of adequate quantities of
plastic material to find desirable operating conditions and to
V = average injection velocity, mm/s,
av
3
make the desired test specimens.
V = shot volume, mm ,
s
T = injection time, s,
i
2
A = cross section of the cavity, mm , (see 3.2
...

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:D3641–10a Designation:D3641–12
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 shall 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 Nov. 1, 2010. Published January 2011. Originally approved 1991. Last previous edition approved 2010 as D3641–10. DOI: 10.1520/D3641-10A.
Current edition approvedApril 15, 2012. Published May 2012. Originally approved 1991. Last previous edition approved 2010 as D3641 – 10A. DOI: 10.1520/D3641-12.
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 19428-2
...