1. Inspect the various raw materials entering the company according to the requirements, and fail to enter the factory if they fail.

2. Control and test each process in the production process, mainly include: chemical composition, particle size, moisture, geometric size, weight, semi-finished product strength, etc. Unqualified semi-finished products do not flow into the next process.

3. Chemical analysis and physical testing of the finished product after calcination, and comparison with the standards required by the customer, the unqualified finished products are not stored in the warehouse.

4. For the factory products, carry out self-inspection, external inspection, third-party inspection, and the unqualified products are not shipped.