GB/T 531.1-2008 English PDF (GB/T531.1-2008)

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GB/T 531.1-2008: Rubber, vulcanized or thermoplastic -- Determination of indentation hardness -- Part 1: Durometer method (Shore hardness)
GB/T 531.1-2008
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.
Rubber, Vulcanized or Thermoplastic -
Determination of Indentation Hardness -
Part 1: Durometer Method (Shore Hardness)
WARNING: The personnel using this Part shall have hands-on experience in
formal laboratory. This Part does not address all possible safety issues. The user
shall assume the responsibility to take appropriate safety and health measures;
and ensure compliance with conditions specified in the national regulations.
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:
- the A scale for rubbers in the normal hardness range; the durometer using the A
scale is called the Shore Type-A durometer;
- the D scale for rubbers in the high hardness range; the durometer using the D
scale is called the Shore Type-D durometer;
- the AO scale for rubbers in the low hardness range and cellular rubbers; the
durometer using the AO scale is called the Shore Type-AO durometer;
- the AM scale for thin rubber test pieces in the normal hardness range; the
durometer using the AM scale is called the Shore Type-AM durometer.
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.
GB/T 2941 Rubber - General Procedures for Preparing and Conditioning Test
Pieces for Physical Test Methods (GB/T 2941-2006, ISO 23529:2004, IDT)