GB/T 9865.1-1996 English PDF (GBT9865.1-1996)

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GB/T 9865.1-1996: Rubber, vulcanized or thermoplastic--Preparation of samples and test pieces--Part 1: Physical tests
GB/T 9865.1-1996
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 83.040.01
G 40
idt ISO 4661-1:1993
Replacing GB 9865-88
Rubber, vulcanized or thermoplastic - Preparation of
samples and test pieces - Part 1: Physical tests
[Replaced (Replaced by GB/T 2941-2006)]
ISSUED ON: OCTOBER 28, 1996
IMPLEMENTED ON: JUNE 01, 1997
Issued by: State Bureau of Quality and Technical Supervision
Table of Contents
Foreword ... 3
ISO Foreword ... 4
ISO Introduction ... 5
1 Scope ... 6
2 Normative references ... 6
3 Test piece thickness ... 6
4 Thickness adjustment ... 7
5 Conditioning of test pieces ... 9
6 Test piece cutters ... 9
Foreword
This Standard is modified from GB 9865-88 according to Part 1 Physical tests of the
international standard ISO 4661-1:1993 Rubber, vulcanized or thermoplastic -
Preparation of samples and test pieces. It is equivalent to it in terms of technical content
and writing rules. According to the provisions of GB/T 1.1-1993, a foreword is added
to this Standard, while the ISO foreword and introduction are retained.
ISO 4661 is divided into two parts under the general title, and Part 1: Physical tests is
adopted for this reversion.
This second edition cancels and replaces the first edition (GB 9865-88), of which it
constitutes a minor editorial revision.
This Standard replaces GB 9865-88 from the date of implementation.
This Standard was proposed by the Ministry of Chemical Industry of the People’s
Republic of China.
This Standard shall be under the jurisdiction of Beijing Rubber Industry Research and
Design Institute of the Ministry of Chemical Industry of the People’s Republic of China.
The drafting organization of this Standard: Beijing Rubber Industry Research and
Design Institute of the Ministry of Chemical Industry.
The drafters of this Standard: Shen Hui, Mei Fengguo, Zhang Juxiu.
Date of first issue of this Standard: July 1988.
This Standard is entrusted to the Beijing Rubber Industry Research and Design Institute
of the Ministry of Chemical Industry for interpretation.
Rubber, vulcanized or thermoplastic - Preparation of
samples and test pieces - Part 1: Physical tests
1 Scope
Part 1 of this Standard specifies methods of preparing test pieces from vulcanized and
thermoplastic rubber for use in physical tests on rubber specified in other standards.
2 Normative references
The following standards contain provisions which, through reference in this text,
constitute provisions of this Standard. At the time of publication, the editions indicated
were valid. All Standards are subject to revision, and parties to agreements based on
this Standard are encouraged to investigate the possibility of applying the most recent
editions of the standards indicated below.
GB/T 2476-94, Symbols of abrasive materials
GB/T 2477-83, Grain size and grain size distribution
GB/T 2479-83, Technical specifications for white fused alumina
GB/T 2484-94, Symbols and designation for bonded abrasive products
GB 2941-91, Standard temperature, humidity and time for environmental regulation
and testing of rubber samples (eqv ISO 471:1983 ISO 1826:1981)
GB/T 5723-93, Rubber, vulcanized or thermoplastic - Determination of dimensions
of test pieces and products for test purposes (eqv ISO 4648:1991)
3 Test piece thickness
The test piece thickness shall be as specified in the relevant test method. However, it is
recommended that the following test piece thicknesses be used for specially moulded
test sheets for all tests unless other thicknesses are technically necessary:
1 mm ± 0.1 mm
2 mm ± 0.2 mm
4 mm ± 0.2 mm
maintaining the cutting edge in a sharp condition. Attachments are available for splitting
and cutting sections from cable sheathing.
4.3 Abrading techniques
When it is necessary to remove unevenness of surface, such as fabric impressions or
corrugations caused by contact with fabric components or cloth wrappings used for
vulcanization or as a result of cutting techniques, this shall be done using the equipment
described in 4.3.1 or that described in 4.3.2.
4.3.1 Abrasive wheels
The abrading apparatus consists of a grinder with a motor-driven abrasive wheel. It is
important that the wheel run true, without vibration, and that the abrasive surface, of
aluminium oxide or silicon carbide, be true and sharp. The grinder may be equipped
with a slow-feed mechanism so that very light cuts may be made to avoid over-heating
of the rubber. Suitable means shall be provided for securing the rubber to prevent
excessive deformation and for controlled traversing of the rubber against the abrasive
wheel.
Note: Wheels of 150 mm diameter operating at a surface speed in the range 10 m/s ~
12 m/s, designated C-30-P-4-V for roughing and designated C-60-P-4-V for
finishing (see GB/T 2476, GB/T 2477, GB/T 2479, GB/T 2484), have been
found suitable.
The depth of cut produced in the first pass shall not exceed about 0.2 mm. Successive
cuts shall be progressively thinner to avoid over-heating. Grinding shall not be carried
out beyond the point where unevenness of thickness has been eliminated. For removal
of greater thicknesses of rubber, cutting techniques as indicated in 4.2 shall be used.
4.3.2 Flexible abrasive belts
The apparatus consists either of a motor-driven drum on which a helical strip of the
abrasive belt is secured or of two pulleys, one motor-driven and the other adjustable to
tension and align the belt. The abrasive belt shall be of textile or paper or a combination
of the two with the abrasive, of aluminium oxide or silicon carbide, bonded to the
surface with a resin unaffected by water. Equipment shall be provided for slow feeding
of the material to the abrasive belt and for securing the material without excessive
deformation.
Note: A surface speed of the band in the range of (20±5) m/s has been found suitable.
In Operation, cuts removing several tenths of a millimetre of rubber are practicable as
much less heat is produced than with the method of 4.3.1. The grinding may be carried
out against the drum, against one of the pulleys or against the taut belt between the
pulleys.