Our company's graphite raw material testing equipment includes anti-folding, anti-pressure machine, Shore hardness tester, metallographic microscope, bulk density detector and so on.
The company has strict quality control procedures for each batch of products, in addition to strict factory inspections, necessary re-inspection, and close communication with domestic authoritative testing institutions to ensure the quality and safety of customers' products.
The inpect flow below:
1 Visually inspect the apparent defects of mechanical carbon materials and products.
2 Physical and chemical properties test of mechanical carbon materials shall be carried out in accordance with the provisions of JB/T8133 (the same material, the same process, the same material continuously produced in the same specification is a batch).
Q/74973203-5·02—2018Under normal circumstances, every three years.
Performance checks should also be performed in one of the following cases:
a) Stereotype identification of new products or old products when they are transferred to the factory;
b) When there are major changes in raw materials, formulations and processes, which may affect product quality;
c) After the product is discontinued for half a year, when the production is resumed;
d) When the result of the factory inspection is significantly different from the result of the last type inspection;
e) When the national quality supervision agency conducts a product quality inspection.
Performance test All items in Chapter 4 of this standard.
3 Samples used for performance testing shall be randomly selected from the factory-qualified samples for inspection.
4All the items inspected are qualified, and the product is judged to be qualified. If there is a non-conforming item in the inspection, it is allowed to double-sample the same batch of products to re-inspect the unqualified items. If the re-inspection is qualified, it is judged that the batch of products is qualified, and if the re-inspection is still unqualified, it is determined that the batch of products is unqualified.
5 Dimensional tolerances and shape tolerances of mechanical carbon products shall be inspected according to the provisions of GB/T3177 and GB/T1958 respectively.
6Sampling and Judging of Mechanical Carbon Graphite Materials and Products
The sampling shall be carried out in accordance with the provisions of GB/T 2828.1. The normal inspection subsampling plan shall be adopted. The inspection level is the special inspection level S-3, and the acceptance quality limit (AQL) is 6.5. The specific sampling plan and judgment are shown in Table 3.