1.Easy-installation, curved without self bounce, so with reliable efficiency 2.Warm-proff, pressure-proof, ... ,uneasy-fouling,non-polluted to liquid but making larger effiecinet pipe diamete,3.100%-insulating from oxygen,thoroughly abolishing permeation,able ... electricity nature,suitable for gas-oil transferring and curving pipe or making pipe straight back.4.They are suitable for use in ...