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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 follow the guidelines specified in GB 527-83, which outlines general requirements for physical testing methods of vulcanized rubber. This ensures consistency and reliability in the testing process.
Second, the shape of the sample depends on the evaluation criteria or the specific property being tested. For observing ozone cracks, a rectangular sample is typically used. However, if the test focuses on tensile properties, a dumbbell-shaped sample is required.
Regarding the rectangular samples, their dimensions should be: length between 70 to 100 mm (with an effective length of over 40 mm), width of 10 ± 0.5 mm, and thickness of 2.0 ± 0.2 mm. In some cases, such as for fracture testing, a narrower rectangular sample with a width of 5 ± 0.1 mm and thickness of either 0.5 ± 0.05 mm or 1 ± 0.1 mm may also be used.
For dumbbell-shaped specimens, they must comply with GB 528-82, which specifies the determination of tensile properties of vulcanized rubber. Either Type I or Type II dumbbell-shaped samples can be applied, depending on the test needs.
Third, the surface of the sample must be smooth, clean, and free from visible impurities, defects, or foreign substances like compounding agents. It’s important to note that results from different sample specifications should not be directly compared, as they may not be comparable due to variations in geometry and material behavior.
Fourth, the number of samples required depends on the evaluation criteria and test objectives. When observing ozone cracking, it's generally recommended to use at least three samples to ensure statistical validity and reduce the impact of anomalies.
It's worth mentioning that all these sample requirements are derived from the GB 7762-87 standard, which specifically outlines the procedures for ozone resistance testing of vulcanized rubber.
By following these detailed guidelines, you can ensure accurate and repeatable results when conducting ozone aging tests, making the data more meaningful and reliable for further analysis.