... ,Yellow, Red Standard: ASTM F1281/ASTM D1282 PEX AL PEX PIPE 1, Non-toxic, corrosion resistance,light weight, good mechanical strength ... low temperature and long service life. 2, Fluid resistance inside pipe is small, not easy scaling, fluid not being polluted, and ... effective large diameter. 3, 100% insulating oxygen,stop oxygen's penetration. Aluminum-plastic pipes can be used as shielding of ...