Hot and cold impact box for testing the material structure or composite materials, in an instant under the extremely high temperature and low temperature can withstand the extent of continuous environment, in the shortest possible time to detect the sample due to thermal expansion and contraction caused by chemical changes or Physical damage; to confirm the product quality and durability. The hot and cold impact box test methods are as follows:

First, the sampling and determine the rules:

1, mass production of hot and cold impact box, batches of more than 20, the sampling 2; less than 20 units, sampling a Taiwan.

2, sampling samples of the type of test items should be fully qualified, otherwise, double inspection of substandard items; such as the second inspection pass, only the first inspection of substandard items for repair, sampling allowed to leave the factory; Sub-test samples are still one failed, then the batch of products failed, such as the second test sample all qualified, then the batch of qualified products.

Second, the type of inspection situation

1, the new product test stereotypes identification

2, the formal production of products in the structure, materials, technology, production equipment and management have a greater change, may affect product performance.
3, the product of mass production, every two years at least once a regular sampling.

4, the national quality supervision agencies to carry out quality supervision and inspection.

5, the factory test results and the last type of test results are quite different.