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GB/T 3512-2001, titled "Vulcanized Rubber or Thermoplastic Rubber – Hot Air Accelerated Aging and Heat Test," outlines the procedures for testing rubber samples using a hot air aging test chamber. The test chamber must meet several specific requirements to ensure accurate and consistent results:
1. The chamber should be equipped with a forced-air circulation system, ensuring an airflow rate between 0.5 m/s and 1.5 m/s. The sample's largest surface should face the airflow direction to prevent any disturbance to the air flow.
2. The size of the aging test chamber should be designed so that the total volume of the samples does not exceed 10% of the effective chamber volume. Specimens should be suspended at least 10 mm apart from each other, and at least 50 mm away from the chamber walls to avoid heat interference.
3. A reliable temperature control system is necessary to maintain the sample temperature within the specified tolerance range during the test.
4. The heating chamber must have a temperature measuring device to accurately record the actual temperature during the test process.
5. The structure of the heating chamber should not include copper or copper alloys, as these materials may react with the rubber or affect the test results.
6. The hot air aging test chamber should allow for 3 to 10 air exchanges per hour to ensure uniform temperature distribution and proper ventilation.
7. Before entering the aging chamber, the air must be preheated to within the acceptable temperature range specified for the test. This ensures that the samples are exposed to stable and controlled conditions from the start.
By following these guidelines, laboratories can conduct accurate and repeatable hot air aging tests, which are essential for evaluating the thermal stability and durability of rubber materials under accelerated aging conditions. Proper setup and maintenance of the test chamber are crucial to achieving reliable results that reflect real-world performance.
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