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The materials used in the wooden heat-insulating fire-proof doors have been strictly inspected and purchased in accordance with the requirements of national standards. Regular sampling inspections are carried out to ensure that all raw materials are 100% in compliance with relevant raw material standards when they are put into production.

The materials used in the wooden heat-insulating fire-proof doors have been strictly inspected and purchased in accordance with the requirements of national standards. Regular sampling inspections are carried out to ensure that all raw materials are 100% in compliance with relevant raw material standards when they are put into production.

The materials used in the wooden heat-insulating fire-proof doors have been strictly inspected and purchased in accordance with the requirements of national standards. Regular sampling inspections are carried out to ensure that all raw materials are 100% in compliance with relevant raw material standards when they are put into production.

The materials used in the wooden heat-insulating fire-proof doors have been strictly inspected and purchased in accordance with the requirements of national standards. Regular sampling inspections are carried out to ensure that all raw materials are 100% in compliance with relevant raw material standards when they are put into production.