GB/T 10807-2006 PDF English
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Flexible cellular polymeric materials -- Determination of hardness (indentation technique)
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| GB/T 10807-1989 | English | 199 |
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Polymeric materials cellular flexible--Determination of hardness (indentation technique)
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GB/T 10807-2006: PDF in English (GBT 10807-2006) GB/T 10807-2006
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 83.100
G 32
GB/T 10807-2006 / ISO 2439:1997
Replacing GB/T 10807-1989
Flexible Cellular Polymeric Materials - Determination of
Hardness (Indentation Technique)
(ISO 2439:1997, IDT)
ISSUED ON: MARCH 10, 2006
IMPLEMENTED ON: OCTOBER 1, 2016
Issued by: General Administration of Quality Supervision, Inspection and
Quarantine;
Standardization Administration of the People’s Republic of China.
Table of Contents
Foreword ... 3
1 Scope ... 4
2 Normative References ... 4
3 Terms and definitions ... 5
4 Principle ... 5
5 Apparatus ... 5
6 Test Pieces ... 6
7 Procedure ... 6
8 Repeat Tests ... 8
9 Test Report ... 8
Foreword
This standard is identical with International Standard ISO 2439:1997 Flexible Cellular Polymeric
Materials — Determination of Hardness (Indentation Technique). In addition to a number of
editorial changes, all technical contents and compiling methods of this standard are identical to ISO
2439:1997.
This standard replaces GB 10807-1989 Flexible Cellular Polymeric Materials — Determination of
Hardness (Indentation Technique) in whole.
The following technical deviations have been made with respect to the GB/T 10807-1989 (the
previous edition).
— “The indentor with a diameter of
0200 mm and a 05.0010 mm rounding at the lower edge” is
changed to: “The indentor with a diameter of
0200 mm and a 5.000.1 mm radius at the lower
edge”;
— In conditioning, add “If at either 16 h or 48 h after manufacture, it can be demonstrated that
the mean result does not differ by more than ±10% from those obtained after 72 h, then testing
is permitted at either after-16 h or after 48 h.”;
— a group of conditions for conditioning is added;
— “the forces required to obtain the indentation of 65% divided by the force required to obtain
the indentation of 25%” in the test result of Method B is deleted.
This standard was proposed by the China National Light Industry Council.
This standard shall be under the jurisdiction of National Technical Committee on Plastic Products
of Standardization Administration of China.
This standard was drafted by Institute of Plastics Process and Application for Light Industry.
The main drafters of this standard: Zeng Xinrong, Shi Guoqing.
The previous editions of this standard are as follows: GB/T 10807-1989.
Flexible Cellular Polymeric Materials - Determination of
Hardness (Indentation Technique)
1 Scope
This standard specifies three methods for determining the indentation hardness of flexible cellular
materials:
— Method A: indentation hardness index, which gives a single indentation measurement for
laboratory test purposes;
— Method B: indentation hardness characteristics, which provides information about the
shape of the hardness indentation curve;
— Method C: indentation hardness check, which is a quick procedure suitable for quality
control testing.
The methods are applicable only to latex, urethane foam and PVC foam of the open cell type.
The results obtained by these methods relate only to the test conditions specified and cannot, in
general, be used directly for design purposes.
Note: The indentation hardness of flexible cellular materials is a measure of their load-bearing properties. The
methods specified can be used for testing finished articles and for the characterization of bulk material.
2 Normative References
The following normative documents contain provisions which, through reference in this text,
constitute provisions of this standard. For dated references, subsequent amendments (excluding
corrections), or revisions, of any of these publications do not apply to this standard. However, parties
to agreements based on this standard are encouraged to investigate the possibility of applying the
most recent editions of the normative documents indicated below. For undated references, the latest
edition of the normative document referred to applies.
GB/T 2941-1991 Rubber — Standard Temperatures, Humidities and Times for the Conditioning
Environmental and Testing of Test Pieces (eqv ISO 470:1983)
6.3. Position the test piece on the supporting surface so that the centre of the test piece, or other
agreed test area, is located below the centre of the indentor. Test pieces having cavities on one side
shall be placed with the cavity side next to the supporting surface. Apply a force of 025 N to the
selected test area and measure the thickness. Indent the test piece at a rate of (100 ± 20)mm/min, to
produce an indentation of (70 ± 2.5)% of the thickness. After reaching 70% deflection, release the
load at the same rate. Repeat this loading and unloading twice more, then proceed in accordance
with Method A, Method B or Method C as appropriate.
7.2 Method A — Determination of indentation hardness index
Immediately after the third unloading (see 7.1), indent the test piece by (40 ± 1)% of the thickness.
Maintain this deflection for a period of (30 ± 1)s, note the corresponding force, in newtons, and
release the force.
Only the result of a test conducted by Method A, on the standard size test piece, without plying,
shall be known as the indentation hardness index.
7.3 Method B — Determination of indentation hardness characteristics
Immediately after the third unloading (see 7.1):
a) indent the test piece by (25 ± 1)% of the thickness;
b) maintain this indentation for a period of (30 ± 1)s;
c) measure the force;
d) increase the indentation to (40 ± 1)% of the thickness;
e) maintain this indentation for a period of (30 ± 1) s;
f) measure the force;
g) increase the indentation to (65 ± 1)% of the thickness;
h) maintain this indentation for a period of (30 ± 1) s;
i) measure the force.
The results of a test conducted by Method B on a standard test piece shall be known as the standard
indentation hardness characteristics of that material. If a product is tested, the results shall be known
as the product indentation hardness characteristics.
Note: Convenient means of expressing the results obtained by Method B are indentation factors, which
are the ratios of the forces required to obtain the indentation of 25% and 65% divided by the force
required to obtain the indentation of 40%.
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Translated by: Field Test Asia Pte. Ltd. (Incorporated & taxed in Singapore. Tax ID: 201302277C)
Linkin: https://www.linkedin.com/in/waynezhengwenrui/
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Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.
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