The requirements for the sample of the vulcanized rubber ozone aging test chamber are as follows:
1. The preparation of the sample shall comply with the provisions of GB 527-83 "General Requirements for Physical Testing Methods of Vulcanized Rubber".
Second, the shape specification of the sample can be selected according to the evaluation index or test performance. The sample for observing the ozone crack is a rectangular sample, and the sample for testing the tensile property is a dumbbell-shaped sample.
1. The specifications of the rectangular sample are: length 70 ~ 100mm (effective length should be greater than 40mm), width 10 ± 0.5mm, thickness 2.0 ± 0.2mm. For the fracture test, a rectangular sample having a width of 5 ± 0.1 mm and a thickness of 0.5 ± 0.05 or 1 ± 0.1 mm can also be used.
2. The specifications of the dumbbell-shaped specimens shall comply with the provisions of GB 528-82 "Determination of tensile properties of vulcanized rubber". Type I or Type 2 dumbbell shaped specimens can be used.
Third, the surface of the sample should be smooth, smooth, clean, and there are no obvious impurities or complexes such as compounding agents. The test results of different specifications of the sample can not be compared.
Fourth, the number of samples should be based on evaluation indicators and test requirements. The test for observing ozone cracking is generally not less than three.
Note: The above requirements for the sample of the vulcanized rubber ozone-resistant aging test box are from the GB 7762-87 standard.
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