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GB/T 35858-2018 English PDF (GBT35858-2018)

GB/T 35858-2018 English PDF (GBT35858-2018)

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GB/T 35858-2018: Rubber, vulcanized -- Test method of salt mist aging

This Standard specifies the test method for determining the change of appearance and physical properties of vulcanized rubber after it is aged in salt mist environment. This Standard is applicable to the evaluation of the resistance of vulcanized rubber to salt mist aging.
GB/T 35858-2018
GB
NATIONAL STANDARD OF THE
PEOPLE REPUBLIC OF CHINA
ICS 83.060
G 40
Rubber, vulcanized - Test method of salt mist aging
ISSUED ON. FEBRUARY 06, 2018
IMPLEMENTED ON. SEPTEMBER 01, 2018
Issued by. General Administration of Quality Supervision, Inspection and Quarantine;
Standardization Administration of the People's Republic of
China.
Table of Contents
Foreword ... 3
1 Scope ... 4
2 Normative references ... 4
3 Method summary ... 4
4 Test devices ... 5
5 Test material and reagents ... 5
6 Sample ... 5
7 Test conditions ... 5
8 Test steps ... 6
9 Expression of test result ... 7
10 Test report ... 7
Foreword
This Standard was drafted in accordance with the rules given in GB/T 1.1-2009. This Standard was proposed by China Petroleum and Chemical Industry
Federation.
This Standard shall be under the jurisdiction of National Technical Committee on Rubber and Rubber Products of Standardization Administration of China (SAC/TC 35).
The drafting organizations of this Standard. Wanli Tire Co., Ltd., Fengshen Tire Co., Double Star Group Co., Ltd., Shenyang Rubber Research and Design
Institute Co., Ltd., Shandong Linglong Tire Co., Ltd., Jiangsu Mingzhu Testing Machinery Co., Ltd., Taizhou Gangyang Rubber and Plastic Co., Ltd., Guizhou Tire Co.
Main drafters of this Standard. Li Ning, Yang Xiangrong, Ren Shaowen, Ma Tiancheng, Guo Fei, Fei Kanghong, Wang Jun, Luan Dewen, Yang Zhifeng,
Zhu Muzhi, Han Zhiqian, Han Xingchen, Deng Wang, Li Kemeng.
Rubber, vulcanized - Test method of salt mist aging
WARNING. Personnel using this Standard shall have hands-on
experience in formal laboratory work. This Standard does not address all possible safety issues, and the user is responsible for taking appropriate safety and health measures and ensuring compliance with the relevant
national regulations.
Attention. Some of the operations covered by this Standard may use,
produce, or generate waste and have a pollution impact on the local
environment. Appropriate documentation for disposal of these materials
shall be developed.
1 Scope
This Standard specifies the test method for determining the change of
appearance and physical properties of vulcanized rubber after it is aged in salt mist environment.
This Standard is applicable to the evaluation of the resistance of vulcanized rubber to salt mist aging.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
GB/T 2941, Rubber - General procedures for preparing and conditioning test pieces for physical test methods
GB/T 6682, Water for analytical laboratory use - Specification and test methods
GB/T 10587, Specifications for salt mist testing chambers
3 Method summary
Expose a vulcanized rubber sample to a salt mist environment. Under the action of hot air and salt solution, the performance of the sample before and after aging is tested after a specified time so as to evaluate the salt mist aging resistance d) Salt mist settling rate. 1.0 mL/(h??80cm2) ~ 2.0 mL/(h??80cm2).
7.2 The test period can be determined according to actual needs or
consultations of relevant parties. The following test cycles are recommended. a) 24h, or multiple of 24h;
b) 7d, or multiple of 7d.
7.3 For sample adjustment, unless otherwise specified, the sample shall be adjusted according to the relevant provisions of GB/T 2941 before and after the salt mist aging test.
8 Test steps
8.1 The preparation of the salt mist solution (sodium chloride solution) includes the following two steps.
a) Preparation of sodium chloride solution. dissolve sodium chloride (5.1) of which the mass is (5??1) portions in water (5.4) of which the mass is 95 portions;
b) Sodium chloride solution pH adjustment. when the temperature is
(35??2)??C, the pH shall be controlled within the range of 6.5~7.2. If the pH value is out of range, use hydrochloric acid solution (prepared from 5.2 hydrochloric acid at a concentration of 0.1mol/L~0.5mol/L) or sodium
hydroxide solution (prepared from 5.3 sodium hydroxide at a
concentration of 0.1mol/L~0.5mol/L) to adjust.
8.2 First adjust the sample according to 7.3. Then determine the performance of the sample before aging.
8.3 Open the salt mist aging box. After the specified test conditions are met, the sample is put into the test and the test time is calculated.
8.4 The sample shall be placed in the effective working area of the salt mist aging box for exposure. At the same time, care shall be taken to avoid
accumulation of fluid on the surface of the sample. Samples shall not overlap or touch each other, and the spacing shall not be less than 5mm. The distance between the sample and the wall of the box shall not be less than 70mm. 8.5 Salt mist settling rate shall be monitored at least every 24h to ensure it is within the specified range. The salt mist settling rate test method shall be carried out in accordance with the provisions of GB/T 10587.
8.6 After the specified test time is reached, the sample is taken out from the salt mist aging box. Use distilled water or deionized water to wash the salt or other

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