● In order to ensure that the raw materials meet the requirements, in addition to the routine inspection of material brand, heat treatment and standards, the hardness, chemical composition and mechanical properties of the raw materials will also be inspected or sent to a third party for testing.

● Prevent fake and shoddy raw materials and standard parts, and conduct traceability inspection on material certificates or COC and physical objects based on lot number / batch number; Ensure the integrity of all chains of material manufacturers, distributors and agents.

● In order to meet the environmental protection requirements, the supplier shall provide relevant COC certificates; Meanwhile, we regularly sends the third party for RoHS and reach tests.

● In order to avoid mixing, color identification shall be carried out on the side of aluminum alloy raw materials in the warehouse to achieve visual management.