Test procedure for rubber materials for heat aging test
The national standard GB/T 17782-1999 outlines the detailed procedure for conducting air heat aging tests on vulcanized rubber materials. The following are the key requirements:
1. Once the heat aging test chamber reaches the designated working temperature, the sample should be suspended vertically within the pressure vessel. To minimize the risk of migration or contamination of the rubber compounds, it is strongly recommended to avoid testing samples with different formulations in the same container.
2. When placing the sample into the preheated container, close the lid immediately and start timing once the pressure reaches 550 kPa. This entire process must be completed within three minutes. It's important to record the time interval from when the aging time starts until the container reaches 125°C. If this interval exceeds 5% of the total test duration, the test time should be adjusted by adding half of the interval to account for the discrepancy.
3. After the specified aging time has been reached, release the pressure slowly to atmospheric levels for at least five minutes before removing the sample. This prevents the formation of internal voids in the material. Once the pressure is normalized, the sample should be removed quickly and placed on a flat surface to cool down to room temperature. No further mechanical, chemical, or thermal treatment should be applied to the sample after removal.
This procedure ensures accurate and consistent results when evaluating the performance of rubber materials under heat aging conditions. Following these steps carefully helps maintain the integrity of the test and provides reliable data for material analysis.
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