GB/T 531.1-2008 PDF English
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Rubber, vulcanized or thermoplastic -- Determination of indentation hardness -- Part 1: Durometer method (Shore hardness)
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| GB/T 531-1999 | English | 279 |
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Rubber--Determination of indentation hardness by means of pocket hardness meters
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| GB/T 531-1992 | English | RFQ |
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Rubber, Vulcanied-The test method for the determination of shore A hardness
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GB/T 531.1-2008: Rubber, vulcanized or thermoplastic -- Determination of indentation hardness -- Part 1: Durometer method (Shore hardness)
---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT531.1-2008
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 83.060
G 40
GB/T 531.1-2008 / ISO 7619-1.2004
Partially replacing GB/T 531-1999
Rubber, Vulcanized or Thermoplastic -
Determination of Indentation Hardness -
Part 1.Durometer Method (Shore Hardness)
(ISO 7619-1.2004, IDT)
Issued on. JUNE 04, 2008
Implemented on. DECEMBER 01, 2008
Issued by. General Administration of Quality Supervision, Inspection and
Quarantine;
Standardization Administration of PRC.
Table of Contents
Foreword... 3
Introduction... 5
1 Scope... 6
2 Normative References... 6
3 Principle and Selection of Shore Durometer... 7
4 Apparatus... 7
5 Test Piece... 12
6 Conditioning... 13
7 Procedure... 13
8 Calibration and Checking... 14
9 Test Report... 14
Bibliography... 16
Foreword
GB/T 531 Rubber Vulcanized or Thermoplastic – Determination of Indentation
Hardness, includes.
--- Part 1.Durometer Method (Shore Hardness);
--- Part 2.IRHD Pocket Meter Method.
This Part belongs to Part 1 of GB/T 531.
This Part equivalently adopts the international standard ISO 7619-1.2004 Rubber
Vulcanized or Thermoplastic – Determination of Indentation Hardness – Part 1.
Durometer Method (Shore Hardness).
For the benefit of use, the following editorial changes are made against the original
ISO standard.
a) Use “this Part” to replace “this International Standard”;
b) Use decimal point “.” to replace the comma “,” serving as the decimal point;
c) Delete the foreword of the international standard;
d) Delete the Footnote 1) of the Clause 2 in the original ISO standard; the Footnote
2) in 8.2, as well as the Footnote 3) in the Bibliography.
This Part replaced the Shore A, D Scale test methods in the GB/T 531-1999 Rubber –
Determination of Indentation Hardness by Means of Pocket Hardness Meters;
meanwhile add the AO, AM scale test methods. This Part excluded the IRHD Pocket
Meter Method in the GB/T 531-1999 Rubber – Determination of Indentation Hardness
by Means of Pocket Hardness Meters.
The major technical differences between this Part and GB/T 531-1999 are as follows.
--- Add the AO scale for rubber in low hardness range (Clause 1 of this Edition);
--- Add the AM scale for thin test piece (Clause 1 of this Edition);
--- Describe the use of stand in details (4.3 of this Edition);
--- Introduce the regulation on the pressure foot area (4.1.1 and 4.2.1 of this Edition);
--- For vulcanized rubber or unknown type of rubber, change the retention time of
spring test force from “1s” to “3s”. Since the hardness value drops significantly
in the first few seconds, it can give more accurate results (7.1 of 1999 Edition;
7.2 of this Edition);
--- For the thermoplastic rubber, introduce 15s for the retention time of the spring
test force. Because its hardness value decreases for a longer period of time
against the vulcanized rubber; such time regulation is the same as that specified
in ISO 868 [1] (7.2 of this Edition);
--- Change the geometry tolerance of the indenter and the calibration tolerance of
the spring test force; so that improve the accuracy of the durometer (4.1.2, 4.2.2,
8.1 of 1999 Edition; 4.1.2, 4.2.2, 4.4 of this Edition).
This Part was proposed by China Petroleum and Chemical Industry Association.
This Part shall be under the jurisdiction of Rubber Physics and Chemical Test Methods
Subcommittee of National Technical Committee for Standardization of Rubber
(SAC/TC 35/SC 2).
Chief drafting organization of this Part. Guangdong Provincial Institute of Metrology
Introduction.
Participating drafting organization of this Part. Shanghai Liuling Instrument Factory.
Chief drafting staffs of this Part. Chen Minghua, Gao Furong, and Tang Changshe.
Participating drafting staffs of this Part. Zuo Weizhong, and Yu Guoan.
The historical editions replaced by this Standard are as follows.
--- GB/T 531-1965, GB/T 531-1992, GB/T 531-1999.
1 Scope
This Part specifies a method for determining the indentation hardness (Shore hardness)
of vulcanized or thermoplastic rubber using durometers with the following scales.
2 Normative References
The provisions in following documents become the provisions of this Part through
reference in this Part. For dated references, the subsequent amendments (excluding
corrigendum) or revisions do not apply to this Part, however, parties who reach an
agreement based on this Part are encouraged to study if the latest versions of these
documents are applicable. For undated references, the latest edition of the referenced
document applies.
3 Principle and Selection of Shore Durometer
The measurement principle of the shore durometer is to press the specific shape of
indenter into the rubber sample under the specific conditions and form the indentation
depth; then convert the indentation depth into the hardness value.
4 Apparatus
The Types A, D indenters shall be formed from a hardened steel rod with diameter of
1.25 mm ± 0.15 mm; their shapes are shown in Figures 1, 2, respectively. Type AO
indenter is the sphere with a radius of 2.5 mm ± 0.02 mm; its shape is shown in Figure
3.
5 Test Piece
The other dimensions of the test piece shall be sufficient to permit measurements at
least 12 mm away from any edge for Shore Types A and D durometers, 15 mm away
from any edge for Shore Type-AO, and 4.5 mm away from any edge for Type-AM,
respectively.
6 Conditioning
Where practical, test pieces shall be conditioned immediately before testing for a
minimum period of 1 h at the standard laboratory temperature in accordance with GB/T
2941.The same temperature shall be used throughout any single test or series of tests
intended to be comparable.
7 Procedure
Apply a spring test force in accordance with 4.3.3 sufficient only to obtain firm contact
between the pressure foot and the test piece; after that, take the reading at the
specified time.
Make five measurements of hardness at different positions on the test piece; then take
the average value. For Shore Type-A, Type-D and Type-AO durometers, the interval
for any two different positions shall be at least 6 mm; while for the Shore Type-AM
durometer, the interval shall be at least 0.8mm.
8 Calibration and Checking
Press the Shore Type-A durometer against a flat piece of glass and adjust the reading
on the scale to give 100 IRHD. Use a set of standard rubber blocks covering the
hardness range approx. 30 IRHD to 90 IRHD to calibrate it.
9 Test Report
The test report shall include the following information.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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