ASTM D5672-95
(Test Method)Standard Test Method for Testing Flexible Cellular Materials Measurement of Indentation Force Deflection Using a 25-mm (1-in.) Deflection Technique
Standard Test Method for Testing Flexible Cellular Materials Measurement of Indentation Force Deflection Using a 25-mm (1-in.) Deflection Technique
SCOPE
1.1 This test method covers a screening type quality control test used to determine if flexible polyurethans 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 proper thickenss cushions 25 mm (1 in.) will 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 grade.
1.6 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.
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Designation: D 5672 – 95
Standard Test Method for
Testing Flexible Cellular Materials Measurement of
Indentation Force Deflection Using a 25-mm (1-in.)
Deflection Technique
This standard is issued under the fixed designation D 5672; 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.
1. Scope 3. Terminology
1.1 This test method covers a screening type quality control 3.1 This test method is an extension of Methods D 3574,
test used to determine if flexible polyurethane foam cushions Test B . Refer to Methods D 3574 for terminology used in this
are within the specified grade range for firmness. Test Method.
1.2 This test method is limited to foams with thicknesses
4. Significance and Use
that are 75 mm (3 in.) or greater.
1.3 This test method is based on the fact that the traditional 4.1 The 25-mm (1-in.) deflection IFD method is recom-
mended for production screening and quality control on full
industry standard thickness for Indentation Force Deflection
(IFD) is 100 mm (4 in.), and the traditional percent deflection size cushions only.
4.2 Applicable cushion thicknesses to be tested by this test
for IFD acceptance and product planning is 25 %. With respect
then to these traditional industry conventions, a 25 % deflec- method are to be only those listed in this test method. Further
research and development are required before this test method
tion on a 100-mm (4-in.) cushion would be 25 mm (1 in.).
Thus, deflecting proper thickness cushions 25 mm (1 in.) will will be applicable to other cushion thicknesses.
4.3 This test method is designed to give a test value
determine if the flexible polyurethane foam is within the
specified grade range for 25 % IFD. approximate to the IFD on a 100-mm (4-in.) thick piece of
foam when the actual thickness to be tested is within the ranges
1.4 Cushion thicknesses less than 75 mm (3 in.) shall not be
tested for IFD using this test method. listed in the test method. In case of disagreement, the referee
method is the IFD procedure in Methods D 3574, Test B . The
1.5 This test method is intended to provide a quick and
simple method to screen flexible polyurethane foams for user of this test method shall establish the correlation between
this test method and the referee method.
determination of grade.
1.6 This standard does not purport to address all of the
5. Apparatus
safety concerns, if any, associated with its use. It is the
5.1 The apparatus used for determining IFD in Methods
responsibility of the user of this standard to establish appro-
D 3574 is used for this test method.
priate safety and health practices and determine the applica-
bility of regulatory limitations prior to use.
6. Conditioning
2. Referenced Documents
6.1 The conditioning conditions described in Methods
D 3574 are best used when using this test method; however,
2.1 ASTM Standards:
since this method is a screening type test method, precise
D 3574 Methods of Testing Flexible Cellular Materials—
conditioning may not be practical.
Slab, Bonded, and Molded Urethane Foams
6.2 It should be realized that since IFD is very sensitive to
D 4483 Practice for Determining Precision for Test Method
temperature and humidity, testing samples that have been
Standards in the Rubber and Carbon Black Industries
exposed to extreme conditions of humidity and temperature
2.2 Method for IFD, Chapter 4.0,
should be avoided. Simply placing the specimens to be tested
“Flexible Polyurethane Foam Standards and Guidelines,”
into an air-conditioned room in the summer or a heated room
Joint Industry Foam Standards and Guidelines Commit-
in the winter and allowing them to equilibrate with the cooled
tee
or heated room air for several hours will alleviate some of the
problems associated with extreme weather conditions.
This test method is under the jurisdiction of ASTM Committee D-20 on Plastic
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