Every batch of incoming raw materials is inspected. Uninspected raw materials are not allowed to be warehoused. Any unqualified products found after warehousing must be isolated immediately and recorded in the account, so as to ensure strict control over raw material quality.

Patrol inspection is carried out during the vulcanization process to check for product appearance defects.

Patrol inspection is conducted during the trimming process to verify product dimensions and lip trimming size.

Full-size inspection is performed on all finished products.