The national standard GB/T15905-1995 standard describes the vulcanized rubber for the damp heat aging test. There are specific provisions for the test device and the sample. Let's take a closer look:
First, the requirements for constant temperature and humidity box:
The test device shall be a damp heat test chamber (or chamber) in accordance with GB 10586. Generally, the following conditions should be met:
a. There is enough space for the sample to be placed, and the volume of the working chamber is not less than five times the total volume of the sample;
b. With automatic constant temperature device, the temperature uniformity of the working chamber is not more than 1 ° C; the temperature tolerance is ± 2 ° C;
c. With automatic constant temperature device, the relative humidity tolerance of the studio is (+2, -3)%;
d. There is a continuous air blowing device and a venting opening, and the average wind speed of the working chamber is not more than 1 m/s.
The testing instruments and methods for temperature, humidity and wind speed of the damp heat test chamber can refer to the relevant provisions of GB 10586.
Second, the requirements for the sample:
1. The preparation of the sample shall comply with the relevant provisions of GB 9865.
2. The shape specification of the sample shall be selected according to the evaluation index and the requirements of the corresponding testing standards. For samples that evaluate changes in tensile properties, dumbbell-shaped specimens specified in GB/T 528 should be used.
3. The number of samples can be determined according to the test items and the test cycle and the requirements of the corresponding standards. The effective samples for testing each performance should generally be no less than three.
Samples that do not meet the requirements of the standard cannot be put into the test. For the samples of different specifications, the test results cannot be compared.
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