ASTM D1621-04
(Test Method)Standard Test Method for Compressive Properties Of Rigid Cellular Plastics
Standard Test Method for Compressive Properties Of Rigid Cellular Plastics
SCOPE
1.1 This test method describes a procedure for determining the compressive properties of rigid cellular materials, particularly expanded plastics, based on test machine crosshead motion.
1.2 The values stated in SI units are to be regarded as the standard. The values in parentheses are for information only.
1.3 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 test method and ISO 844 are technically equivalent.
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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn. Contact ASTM
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Designation: D 1621 – 04
Standard Test Method for
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Compressive Properties Of Rigid Cellular Plastics
This standard is issued under the fixed designation D 1621; 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.
This standard has been approved for use by agencies of the Department of Defense.
1. Scope* 3.1.2 compliance correction—an analytical method of
modifying test instrument displacement values to eliminate the
1.1 This test method describes a procedure for determining
amount of that measurement attributed to test instrument
the compressive properties of rigid cellular materials, particu-
compliance.
larly expanded plastics.
3.1.3 compressive deformation—the decrease in length pro-
1.2 The values stated in SI units are to be regarded as the
duced in the gage length of the test specimen by a compressive
standard. The values in brackets are for information only.
load expressed in units of length.
1.3 This standard does not purport to address all of the
3.1.4 compressive strain—the dimensionless ratio of com-
safety concerns, if any, associated with its use. It is the
pressive deformation to the gage length of the test specimen or
responsibility of the user of this standard to establish appro-
the change in length per unit of original length along the
priate safety and health practices and determine the applica-
longitudinal axis.
bility of regulatory limitations prior to use.
3.1.5 compressive strength—the stress at the yield point if a
NOTE 1—This test method and ISO 844 are technically equivalent.
yield point occurs before 10 % deformation (as in Fig. 1a) or,
in the absence of such a yield point, the stress at 10 %
2. Referenced Documents
deformation (as in Fig. 1b).
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2.1 ASTM Standards:
3.1.6 compressive stress (nominal)—the compressive load
D 618 Practice for Conditioning Plastics for Testing
per unit area of minimum original cross section within the gage
E 4 Practices for Force Verification of Testing Machines
boundaries, carried by the test specimen at any given moment,
E 83 Practice for Verification and Classification of Exten-
expressed in force per unit area.
someter Systems
3.1.7 compressive stress-strain diagram—a diagram in
E 691 Practice for Conducting an Interlaboratory Study to
which values of compressive stress are plotted as ordinates
Determine the Precision of a Test Method
against corresponding values of compressive strain as abscis-
2.2 ISO Standard:
sas.
ISO 844 Cellular Plastics—Compression Test of Rigid Ma-
3.1.8 compressive yield point—the first point on the stress-
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terials
strain diagram at which an increase in strain occurs without an
increase in stress.
3. Terminology
3.1.9 deflectometer—a specialized extensometer used for
3.1 Definitions:
sensing of extension or motion, usually without reference to a
3.1.1 compliance—the displacement difference between test
specified gage length.
machine drive system displacement values and actual specimen
3.1.10 displacement—compression platen movement after
displacement.
the platens contact the specimen, expressed in millimetres or
inches.
1 3.1.11 gage length—the initial measured thickness of the
This test method is under the jurisdiction of ASTM Committee D20 on Plastics
and is the direct responsibility of Subcommittee D20.22 on Cellular Plastics. test specimen expressed in units of length.
Current edition approved July 1, 2004. Published July 2004. Originally approved
3.1.12 modulus of elasticity—the ratio of stress (nominal) to
in 1959. Last previous edition approved in 2000 as D 1621 - 00.
corresponding strain below the proportional limit of a material
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For referenced ASTM standards, visit the ASTM website, www.astm.org, or
expressed in force per unit area based on the minimum initial
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
cross-sectional area.
the ASTM website.
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Available from American National Standards Institute (ANSI), 25 W. 43rd St.,
4th Floor, New York, NY 10036.
*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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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.
D1621–04
X = 10 % CORE DEFORMATION
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X = DEFLECTION (APPROXIMATELY 13 %)
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FIG. 1 a Compressive Strength (See 3.1.5 and Section 9) FIG. 1 b Compressive
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