ISO 1926:2005

INTERNATIONAL ISO
STANDARD 1926
Third edition
2005-07-15
Rigid cellular plastics — Determination of
tensile properties
Plastiques alvéolaires rigides — Détermination des caractéristiques en
traction

Reference number
ISO 1926:2005(E)
©
ISO 2005

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ISO 1926:2005(E)
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ISO 1926:2005(E)
Contents Page
1 Scope . 1
2 Normative references . 1
3 Principle . 1
4 Apparatus . 1
5 Test specimens . 2
6 Procedure (general method) . 2
7 Calculation and expression of results . 3
8Variant — Use of metal plates . 4
9 Precision . 6
10 Test report . 6
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ISO 1926:2005(E)
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies
(ISO member bodies). The work of preparing International Standards is normally carried out through ISO
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The main task of technical committees is to prepare International Standards. Draft International Standards
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International Standard requires approval by at least 75 % of the member bodies casting a vote.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. ISO shall not be held responsible for identifying any or all such patent rights.
ISO 1926 was prepared by Technical Committee ISO/TC 61, Plastics, Subcommittee SC 10, Cellular plastics.
This third edition cancels and replaces the second edition (ISO 1926:1979), which has been technically revised.
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INTERNATIONAL STANDARD ISO 1926:2005(E)
Rigid cellular plastics — Determination of tensile properties
1Scope
This International Standard specifies a method of determining the behaviour of rigid cellular plastics materials
when they are subjected to a tensile stress.
It applies primarily to cellular materials having a compression resistance sufficient to permit suitable gripping of
the test specimens. If it is impossible to grip the test specimen, the method is modified so that the ends of the
specimen are reinforced with metal plates (see Clause 8).
The relationship between cell size and test specimen size must be such that the test is realistic.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated
references, only the edition cited applies. For undated references, the latest edition of the referenced document
(including any amendments) applies.
ISO 291, Plastics — Standard atmospheres for conditioning and testing
ISO 5725-2, Accuracy (trueness and precision) of measurement methods and results — Part 2: Basic method
for the determination of repeatability and reproducibility of a standard measurement method
3 Principle
A test specimen of a given shape is subjected to a tensile stress transmitted to the test specimen by means of
a suitable device and corresponding stress-strain curve is plotted.
4 Apparatus
The test machine shall be such that:
a) It has clamps suitable for holding the test specimen. These clamps shall meet the following requirements:
1) they shall close sufficiently tightly on the faces of the test specimen to avoid slipping;
2) they shall not exert, on any part of the ends of the test specimen, localized pressure which could cause
tears, deformations or ruptures.
In cases of difficulty, use the variant described in Clause 8.
b) The movable clamp can be moved, with the test specimen in place, away from the fixed clamp at a constant
speed of (5 ± 1) mm/min in a direction parallel to the longitudinal axis of the test specimen.
c) The force thus exerted on the test specimen can be determined with a maximum error of 1%, and can be
recorded.
d) If an extensometer is used, it shall exert a minimum force on the test specimen and shall permit the increase
in gauge length of the test specimen to be read to an accuracy of 0,1 mm. The distance between the two
parallel surfaces defining the extensometer gauge length shall not vary by more than 1% (tolerance on
parallelism).
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