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We adopt preservative treatment for all pipes according to international atandard. internal cement lining conforms to ISO4179 standard and the cement mortar is firm, dense, amooth and it has strong adhesion. external zinc spraying( ≥130 g/m2) and bitmen coating (≥70μm) conform to ISO 8179 standard
ISO2531 Centrifugal Casting Ductile Iron Pipe DN80-1200 T type K9 factory