​​ChinaAutoRegs|GB/T 3672.1-2002英文版翻译 橡胶制品的公差 第1部分 尺寸公差
RUBBER - TOLERANCES OF PRODUCTS -PART 1: DIMENSIONAL TOLERANCES

1 SCOPE

This Standard specifies classes of dimensional tolerances, and their values, for moulded, extruded and calendered solid rubber products. The relevant test methods necessary for the establishment of compliance with this Standard are also specified.
The tolerances are primarily intended for use with vul¬canized rubber but may also be suitable for products made of thermoplastic rubbers.
This Standard does not apply to precision to¬roidal sealing rings or to calendered composite prod¬ucts such as rubber-coated fabrics or products where a rubber coating is applied by the process of topping or skim coating.

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 listed below. 
GB/T 321-1980 Preferred numbers — Series of preferred numbers
GB/T 2941-1991 Standard temperature, humidity and time for environmental regulation and testing of rubber samples (eqv ISO 471:1995)
GB/T 5723-1993 Rubber, vulcanized or thermoplastic－Determination of dimensions of test pieces and products for test purposes (eqv ISO 4648:1991)
GB/T 6031-1998 Rubber, vulcanized or thermoplastic — Determination of hardness (hardness between 10 IRHD and 100 IRHD) (idt ISO 48:1994)
ISO 2230:1973 Vulcanized rubber — Guide to storage.

3 MEASUREMENT OF DIMENSIONS

3.1 General

For solid products, measurements of dimensions shall not be made until 16 h have elapsed after vulcanization, this minimum time being extended to 72 h in cases of dispute. Measurements shall be completed within 3 months after the date of dispatch to the purchaser or before the product is put into use, whichever is the shorter time. Measurements shall be made at standard temperature, after conditioning (see GB/T 2941). Care shall be taken to ensure that the products are not subjected to adverse storage conditions (see ISO 2230) and that they are not distorted during measurement.

3.2 Test instruments

3.2.1 Depending on the circumstances, measurements shall be made using one or more of the following types of instrument.
3.2.1.1 For solid products, a micrometer dial gauge, the foot of which shall exert a pressure of 22 kPa ± 5 kPa for rubber of hardness equal to or greater than 35 IRHD or of 10 kPa ± 2 kPa for rubber of hardness less than 35 IRHD (see GB/T 5723 and GB/T 6031).
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