GB/T 31976-2015Aluminium alloy sheets used for sound-absorbing composite panel with through-hole (English PDF)

5.1 Inspection and acceptance

5.1.1 The sheets shall be inspected by the supplier, ensure the sheet quality to conform to the provisions of this Standard and order (or contract), and fill in the quality certificate.

5.1.2 The purchaser shall re-inspect the sheets according to this Standard after receiving the sheets. If the inspection results don't comply with the requirements of this Standard and order (or contract), it shall be submitted to the supplier in written form, and be settled through the consultation between the supplier and purchaser.

The objection on the appearance quality and dimension tolerance shall be submitted within 1 month since the date of receipt of the sheets; while the objection on other performances shall be submitted within 3 months since the date of receipt of the sheets. If arbitration is required, it can be entrusted to the organization approved by the supplier and purchaser to conduct, and carry out common sampling against the purchaser.

5.2 Batch

The sheets shall be submitted in batches; each batch shall consist of the same state and specification of the sheets.

5.3 Weighing

The sheet shall be weighed by weight-check.

5.4 Inspection items

Each batch of sheets shall be inspected the chemical compositions, dimension tolerance, mechanical properties, bending properties, and appearance quality before they leave the factory.

5.5 Sampling

The sampling of the sheets shall conform to the provisions of Table 8. such batch of sheets shall be judged as disqualified. The supplier is allowed to inspect the sheets piece by piece through the consultation between the supplier and purchaser, and the qualified sheets can be delivered. The supplier is also allowed to repeat the heat treatment, and conduct the re-sampling inspection.

6.1 Marks

The marks of the sheets shall conform to the provisions of GB/T 3199.

6.2 Package, transportation, and storage

The sheets are required to coat no oil, and cushion paper package between them.

The requirements for other package, transportation, and storage shall conform to the provisions of GB/T 3199.

6.3 Quality certificate

Each batch of sheets shall be accompanied by a product quality certificate, which shall indicate the following contents.

a) Name, address, telephone, and fax of the supplier;

b) Product name;

c) Grade, state, and specification;

d) Batch number;

e) Net weight or number of boxes (pieces);

f) This Standard number;

g) Inspection stamp from the inspection results and inspection department for the analysis items;

h) Packing date (or exit-factory date). […]