... :1. Pressure grade: PN12.5, PN16, PN20, PN25, PN322. Size: 20mm, 25mm, 32mm, 40mm, 50mm, 63mm3. Color:white, gray ... ,green4. PN12.5 and PN16 is for cold water pipe. PN20, PN25, PN32 is for hot water. 5. ... low thermal conductivity which is only 1/1500 of brass pipe and 1/250 of steel pipe5. Light weight6. ... .6. Piping system for other industries and agriculture. High quality white/green PPR pipes