ASTM D5672/D5672M-22

Standard Test Method for Testing Flexible Cellular Materials Measurement of Indentation Force Deflection Using a 25-mm [1-in.] Deflection Technique

SIGNIFICANCE AND USE
4.1 The 25-mm [1-in.] deflection IFD method is recommended for production screening and quality control on full size cushions only.  
4.2 Applicable cushion thicknesses to be tested by this test method are only those listed in this test method. Further research and development are required before this test method is applicable to other cushion thicknesses.  
4.3 This test method is designed to give a value approximating the 25 % IFD on a 100-mm [4-in.] thick piece of foam when the actual specimen thickness tested is within the ranges listed in the test method. In case of disagreement, the referee method is the IFD procedure in Test Methods D3574, Test B1. The user of this test method shall establish the correlation between this test method and the referee method.
SCOPE
1.1 This test method covers a screening type quality control test used to determine if flexible polyurethane foam cushions are within the specified grade range for firmness.  
1.2 This test method is limited to foams with thicknesses that are 75 mm [3 in.] or greater.  
1.3 This test method is based on the fact that the traditional industry standard thickness for Indentation Force Deflection (IFD) is 100 mm [4 in.], and the traditional percent deflection for IFD acceptance and product planning is 25 %. With respect, then, to these traditional industry conventions, a 25 % deflection on a 100-mm [4-in.] cushion would be 25 mm [1 in.]. Thus, deflecting standard cushions (of proper 100 mm thickness) 25 mm [1 in.] provides a quick way to determine if the flexible polyurethane foam is within the specified grade range for 25 % IFD.  
1.4 Cushion thicknesses less than 75 mm [3 in.] shall not be tested for IFD using this test method.  
1.5 This test method is intended to provide a quick and simple method to screen flexible polyurethane foams for determination of its firmness grade.  
1.6 Units—The values stated in U.S. Customary or SI units are to be regarded separately as standard. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in non-conformance with the 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use.
Note 1: This test method and ISO 2439 address the same subject matter, but differ in technical content.  
1.8 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: 30-Jun-2022
• ICS: 83.100 - Cellular materials
• Technical Committee: D20 - Plastics
• Drafting Committee: D20.22 - Cellular Materials - Plastics and Elastomers

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: D5672/D5672M −22
Standard Test Method for
Testing Flexible Cellular Materials Measurement of
Indentation Force Deflection Using a 25-mm [1-in.]
1
Deflection Technique
This standard is issued under the fixed designation D5672/D5672M; 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.
NOTE 1—This test method and ISO 2439 address the same subject
1. Scope*
matter, but differ in technical content.
1.1 This test method covers a screening type quality control
1.8 This international standard was developed in accor-
test used to determine if flexible polyurethane foam cushions
dance with internationally recognized principles on standard-
are within the specified grade range for firmness.
ization established in the Decision on Principles for the
1.2 This test method is limited to foams with thicknesses
Development of International Standards, Guides and Recom-
that are 75 mm [3 in.] or greater.
mendations issued by the World Trade Organization Technical
Barriers to Trade (TBT) Committee.
1.3 This test method is based on the fact that the traditional
industry standard thickness for Indentation Force Deflection
2. Referenced Documents
(IFD) is 100 mm [4 in.], and the traditional percent deflection
2
forIFDacceptanceandproductplanningis25 %.Withrespect,
2.1 ASTM Standards:
then, to these traditional industry conventions, a 25 % deflec-
D883 Terminology Relating to Plastics
tion on a 100-mm [4-in.] cushion would be 25 mm [1 in.].
E456 Terminology Relating to Quality and Statistics
Thus, deflecting standard cushions (of proper 100 mm thick-
D3574 Test Methods for Flexible Cellular Materials—Slab,
ness) 25 mm [1 in.] provides a quick way to determine if the
Bonded, and Molded Urethane Foams
flexible polyurethane foam is within the specified grade range
E691 Practice for Conducting an Interlaboratory Study to
for 25 % IFD.
Determine the Precision of a Test Method
E2935 Practice for Evaluating Equivalence of Two Testing
1.4 Cushion thicknesses less than 75 mm [3 in.] shall not be
Processes
tested for IFD using this test method.
2.2 ISO Standard:
1.5 This test method is intended to provide a quick and
ISO 2439 Flexible Cellular Polymeric Materials—
simple method to screen flexible polyurethane foams for
Determination of Hardness (Indentation Technique)
determination of its firmness grade.
2.3 Method for IFD, Chapter 4.0,
1.6 Units—The values stated in U.S. Customary or SI units
“Flexible Polyurethane Foam Standards and Guidelines,”
are to be regarded separately as standard. The values stated in
Joint Industry Foam Standards and Guidelines Commit-
each system may not be exact equivalents; therefore, each
3
tee
system shall be used independently of the other. Combining
values from the two systems may result in non-conformance
3. Terminology
with the standard.
3.1 Terms used in this standard are defined in accordance
1.7 This standard does not purport to address all of the
safety concerns, if any, associated with its use. It is the with Terminology D883, unless otherwise specified. For terms
relating to precision and bias and associated issues, the terms
responsibility of the user of this standard to establish appro-
priate safety, health, and environmental practices and deter- used in this standard are defined in accordance with Terminol-
ogy E456.
mine the applicability of regulatory limitations prior to use.
1 2
This test method is under the jurisdiction ofASTM Committee D20 on Plastics For referenced ASTM standards, visit the ASTM website, www.astm.org, or
and is the direct responsibility of Subcommittee D20.22 on Cellular Materials - contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
Plastics and Elastomers. Standards volume information, refer to the standard’s Document Summary page on
Current edition approved July 1, 2022. Published July 2022. Originally approved the ASTM website.
3
in 1995. Last previous edition approved in 2015 as D5672 - 15. DOI: 10.1520/ Available from the Polyurethane FoamAssociation (PFA), 334 Lakeside Plaza
D5672_D5672M-22. Loudon, TN 37774, http://www.pfa.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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D5672/D5672M − 22
4. Significance and Use 7.1.2 The preflex indentation speed, the indenter foot, and
thefinalindentationspee
...

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: D5672/D5672M − 15 D5672/D5672M − 22
Standard Test Method for
Testing Flexible Cellular Materials Measurement of
Indentation Force Deflection Using a 25-mm [1-in.]
1
Deflection Technique
This standard is issued under the fixed designation D5672/D5672M; 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 test method covers a screening type quality control test used to determine if flexible polyurethane foam cushions are
within the specified grade range for firmness.
1.2 This test method is limited to foams with thicknesses that are 75 mm [3 in.] or greater.
1.3 This test method is based on the fact that the traditional industry standard thickness for Indentation Force Deflection (IFD)
is 100 mm [4 in.], and the traditional percent deflection for IFD acceptance and product planning is 25 %. With respect, then, to
these traditional industry conventions, a 25 % deflection on a 100-mm [4-in.] cushion would be 25 mm [1 in.]. Thus, deflecting
standard cushions (of proper 100 mm thickness) 25 mm [1 in.] provides a quick way to determine if the flexible polyurethane foam
is within the specified grade range for 25 % IFD.
1.4 Cushion thicknesses less than 75 mm [3 in.] shall not be tested for IFD using this test method.
1.5 This test method is intended to provide a quick and simple method to screen flexible polyurethane foams for determination
of its firmness grade.
1.6 Units—The values stated in U.S. Customary or SI units are to be regarded separately as standard. The values stated in each
system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the
two systems may result in non-conformance with the 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 safety, health, and healthenvironmental practices and determine the
applicability of regulatory limitations prior to use.
NOTE 1—This test method and ISO 2439 address the same subject matter, but differ in technical content.
1.8 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 test method is under the jurisdiction of ASTM Committee D20 on Plastics and is the direct responsibility of Subcommittee D20.22 on Cellular Materials - Plastics
and Elastomers.
Current edition approved June 1, 2015July 1, 2022. Published July 2015July 2022. Originally approved in 1995. Last previous edition approved in 20092015 as
D5672 - 09.D5672 - 15. DOI: 10.1520/D5672_D5672M-15.10.1520/D5672_D5672M-22.
*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 ----------------------
D5672/D5672M − 22
2. Referenced Documents
2
2.1 ASTM Standards:
D883 Terminology Relating to Plastics
E456 Terminology Relating to Quality and Statistics
D3574 Test Methods for Flexible Cellular Materials—Slab, Bonded, and Molded Urethane Foams
E691 Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method
E2935 Practice for Evaluating Equivalence of Two Testing Processes
2.2 ISO Standard:
ISO 2439 Flexible Cellular Polymeric Materials—Determination of Hardness (Indentation Technique)
2.3 Method for IFD, Chapter 4.0,
3
“Flexible Polyurethane Foam Standards and Guidelines,” Joint Industry Foam Standards and Guidelines Committee
3. Terminology
3.1 This test method is based on Test Methods Terms used in this standard are defined in accordance with Terminology
D3574D883, Test Bunless otherwise . Refer to Test Methods specified. For terms relating to precision and D3574 for terminology
1
bias and associated issues, the terms used in this test method.standard are defined in accordance with Terminology E456.
4. Significance and Use
4.1 The 25-mm [1-in.] deflection IFD method is recommended for production screening and quality control on full size cushions
...