DF will inspect all the insulators in person from production process to package for normal business and the available manufacturer’s products introduced by us.

Quality control process:

1、Raw materials inspection
　 a.Ball Milling
　 b.Sifting, iron separating
　 c.Filter pressing

2、Production of Porcelain body inspection
　 a.Vacuum extrusion
　 b.Shaping

3、Drying inspection

4、Glazing inspection

5、Firing inspection

6、Assembly inspection

7、Curing inspection

8、Routine Testing

9、Sample Testing

10、Sample testing report

11、Packing inspection