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Vulcanized rubber ozone aging test chamber requirements for samples
The sample requirements for the vulcanized rubber ozone aging test chamber are as follows:
First, the preparation of the sample must adhere to the guidelines specified in GB 527-83, which outlines the general requirements for physical testing methods of vulcanized rubber. This ensures consistency and reliability in the testing process.
Second, the shape of the sample should be selected based on the specific evaluation index or test performance. For example, a rectangular sample is typically used when observing ozone cracking, while a dumbbell-shaped sample is preferred for tensile property testing.
For rectangular samples, the dimensions should be as follows: length between 70 and 100 mm (with an effective length exceeding 40 mm), width of 10 ± 0.5 mm, and thickness of 2.0 ± 0.2 mm. In cases where a fracture test is required, a narrower rectangular sample with a width of 5 ± 0.1 mm and a thickness of either 0.5 ± 0.05 mm or 1.0 ± 0.1 mm may also be used.
Dumbbell-shaped specimens must conform to the specifications outlined in GB 528-82, which details the determination of tensile properties of vulcanized rubber. Either Type I or Type II dumbbell-shaped samples can be utilized depending on the test conditions.
Third, the surface of the sample must be smooth, clean, and free from any visible impurities or foreign substances such as compounding agents. It is important to note that results from different sample sizes or shapes cannot be directly compared, as they may yield varying outcomes.
Fourth, the number of samples required depends on the evaluation criteria and testing needs. When conducting tests to observe ozone cracking, it is generally recommended to use at least three samples to ensure statistical significance and accuracy.
It is worth mentioning that these sample requirements are derived from the GB 7762-87 standard, which provides detailed specifications for the vulcanized rubber ozone resistance aging test chamber.
By following these guidelines, researchers and technicians can ensure accurate and repeatable results during ozone aging tests, helping to evaluate the durability and performance of vulcanized rubber under various environmental conditions.