1. When the customer sends the sample, the business acceptance clerk asks the customer to show the following materials at the first time: (1) Sampling sheet (2) Entrustment sheet.

2. The sampling sheet must be signed by the witness of the public security fire control institution where the inspected unit is located, the sampling personnel of the construction unit and the participants of the supervision unit (or the participants of the construction unit), and must have the official seal of the construction unit.

3. When testing samples, each group of samples must have a witness sampling seal, which must be signed by the witness, the sampling personnel of the construction unit and the participants of the supervision unit (or the participants of the construction unit), and sealed by the supervision unit (or the construction unit).

4. Publish the inspection schedule on PTCM system. The information entered into the computer shall be subject to the sampling list and the entrustment list, and a charge notice shall be issued. Generally, customers who submit for inspection are required to pay the inspection fee (cash or check) at the finance department at the same time. Customers who send samples for inspection in large quantities can take remittance under special circumstances. The charge is based on the classification table of witness sampling of building interior decoration materials.

I hope my answer can help you!