The ventilated aging test chamber is a crucial tool used to simulate the aging process of plastics under high-temperature and atmospheric pressure conditions. This helps in evaluating the material's properties and comparing them with those of unaged samples, ultimately aiding in the improvement of existing materials. In the plastics industry, gas aging tests are typically conducted using two main methods.
Method A: Gravity convection heat aging chamber – this method is recommended for samples with a nominal thickness of no more than 0.25 mm. The chamber should follow GB/T 11026.4-1999 specifications, without forced air circulation. Method B: Forced ventilation heat aging chamber – ideal for specimens with a thickness greater than 0.25 mm. It must also adhere to GB/T 11026.4-1999, but with forced air circulation. The air exchange rate should be around (50 ± 10) times per hour, and the temperature inside the chamber must remain uniform. It is advisable to use recording instruments to monitor both temperature and humidity during the test.
According to the GB/T 7141-2008 standard, there are four key requirements for samples during the testing in a ventilated aging chamber:
1. The number and type of samples must meet the requirements of the relevant national standards for specific property testing. At least three parallel samples of each material should be exposed at each selected cycle and temperature, unless otherwise specified or agreed upon by all parties.
2. The thickness of the sample should be equivalent to, but not exceed, the minimum thickness expected in its intended application.
3. The samples should be prepared in the same way as they would be in real-world applications.
4. All samples tested at different temperatures should come from the same batch.
In the next part, we will go into detail about the specific test procedures and methods for plastics in aging tests. Stay tuned for more insights!
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