1. Ko te hanganga anti-corrosive o 3PE anti-corrosive paipa maitai 3PE anti-corrosion te tikanga e toru nga paparanga: te paparanga tuatahi o te paura epoxy (FBE> 100um), te paparanga tuarua o te whakapiri (AD) 170 ~ 250um, me te tuatoru apa o te polyethylene (PE) 2.5 ~ 3.7mm.I roto i te mahi tūturu, te toru mater...
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