PVC pipe is made of polyvinyl chloride resin and stabilizer, lubricants with hot pressing extrusion ......
How is PVC hose produced? The hose contains a large amount of plasticizer and some stabilizers and ......
The valve should be placed in a ventilated and dry privilege, and the two ends of the valve should b......
According to different compositions, copper alloys are divided into brass and bronze. Adding certain......