... , ISO14001 certificates, high quality and competitive price.product quality refers to ISO4427, DIN 8074, ASTM D3035, BS-6437, GB/T13663- ... and its material is non-toxic, does not scale. it is not easy to form dirt, and avoids secondary pollution of drinking ... projects or sand suction projects4.Food & chemical industry5.To transport ore & tailings6.To replace cement pipe, cast iron pipe & steel pipe7 ...