... Polyester (FRP/GRP) Sectional Water Tank Materials: Resin -Isophtalic unsaturated polyester resin Mixture of Unsaturated Polyester Resin, glass-fiber, filler, ... hot dipped galvanised steel and in contact with water internally are stainless steel 304. Flange: inlet, ... residential buildings, hotels, and restaurants to stock higher quality water for human consumption, foods, medicine, sanitation, and ...