- (copper upwards casting industry) protective casting
- 2016-10-24 23:53
- Protective casting is used in copper's product by upwards casting industry,Because of the characteristic of insoluble i
- Self-lubricating bearings
- 2016-10-22 19:57
- High purity graphite bearing,mobile sealing ring,sealing ring of erosion proof and standing high temperatuer(for pumps,s