GB/T 3512-2014Rubber, vulcanized or thermoplastic -- Accelerated ageing and heat resistance tests -- Air-oven method (English PDF)

Foreword

This Standard is drafted according to the rules provided in GB/T 1.1-2009.

This Standard replaces GB/T 3512-2001 Rubber, vulcanized or thermoplastic -

Accelerated ageing and heat resistance tests - Air-oven method; compared with GB/T

3512-2001, the main technical changes are as follows.

— Add test method of rubber tensile performance ISO 37 and test method of rubber

hardness ISO 48 (as shown in 3.1 of this edition);

— Add test method of multicell ageing oven, cabinet type ageing oven and forced

ventilation ageing oven and its wind speed (as shown in 4.1.2, 4.1.3, 4.1.4 of this

edition);

— Add provision for equipment verification (as shown in chapter 5 of this edition);

— Use ISO 23529 to replace GB/T 2941 (as shown in chapter 8 of 2001 edition);

— Add results of precision test (as shown in chapter 11 of this edition; chapter 10 of

2001 edition).

Using translation method, this Standard equivalently adopts ISO 188.2011 Vulcanized

rubber or thermoplastic elastomer hot air - Accelerated aging heat resistance test. The

Chinese documents, in this Standard, which have corresponding relationship with the

normative international documents are as follows.

— GB/T 528-2009 Rubber, vulcanized or thermoplastic - Determination of tensile

stress-strain properties (ISO 37.2005, IDT);

— GB/T 2941-2006 Rubber - General procedures for preparing and conditioning test

pieces for physical test methods (ISO 23529.2004, IDT);

— GB/T 6031-1998 Rubber, vulcanized or thermoplastic - Determination of hardness

(hardness between 10 IRHD and 100 IRHD) (idt ISO 48.1994).

This Standard was proposed by China Petroleum and Chemical Industry Association.

This Standard shall be under the jurisdiction of Branch of National Rubber and Rubber

Goods Technical Committee for Standardization General Test Method (SAC/TC 35/SC 2).

Main drafting organizations of this Standard. Guangzhou Synthetic Material Research

Institute Co., Ltd., National Rubber and Latex Products Quality Supervision Test Center,

Fengshen Tyre Co., Ltd., Cooper Chengshan (Shandong province) Co., Ltd., Qingdao Yi

Kesi New Material Co., Ltd., Shandong Bayi Tyre Manufacture Co., Ltd., Jiangsu Mingzhu

Test Machinery Co., Ltd., Beijing Rubber Industry Research and Design Institute, Guizhou

Tyre Co., Ltd.

Main drafters of this Standard. Xie Yufang, Yi Jun, Dao Jinahua, Zheng Xiangqian, Ren

Shaowen, Wang Jianfeng, Lin Qingju, Wang Daiqiang, Liu Qiang, Zhao Jianlin, Zhu Ming,

Xie Junfang, Li Jing, Feng Ping.

The historical versions replaced by this Standard are as follows.

— GB/T 3512-1983 (1989), GB/T 3512-2001.

1 Scope

This Standard specifies accelerated ageing or heat resistance tests on vulcanized or

thermoplastic rubbers. Two methods are given.

2 Normative references

The articles contained in the following documents have become part of this document

when they are quoted herein. For the dated documents so quoted, all the modifications

(including all corrections) or revisions made thereafter shall be applicable to this

document.

GB/T 25269-2010 Rubber - Guide to the calibration of test equipment (ISO

18899.2004, IDT)

3 Principle

Test pieces are subjected to controlled deterioration by air at an elevated temperature and

at atmospheric pressure, after which specified properties are measured and compared

with those of unaged test pieces.

4 Apparatus

The oven shall be of such a size that the total volume of the test pieces does not exceed

10 % of the free space in the oven. Provision shall be made for suspending test pieces so

that they are at least 10 mm from each other and, in cabinet ovens and ovens with forced

air circulation, at least 50 mm from the sides of the oven.

5 Calibration

The test apparatus shall be calibrated in accordance with Annex D.

6 Test pieces

It is recommended that the accelerated ageing or heat resistance test be carried out on

test pieces prepared and conditioned as required for the appropriate property tests, and

not on complete products or sample sheets, and that their form be such that no

mechanical, chemical or heat treatment will be required after ageing.

7 Time interval between vulcanization and testing

Unless otherwise specified for technical reasons, the following requirements shall be

observed.

8 Ageing conditions (duration and temperature)

The period required to obtain a given degree of deterioration of the test pieces will depend

upon the type of rubber under examination.

9 Procedure

Heat the oven to the operating temperature and place the test pieces in it.

10 Expression of results

The results shall be expressed in accordance with the International Standard for the

appropriate property tests.

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