1.Light weight, low heat conduction rate, insulating 2.DN200-3000,Acid, alkali salt resist, 3.high pressure resistance The filament winding FRP sand filled pipes are mainly used in such fields as water conservancy, sewage, petroleum, chemical industry, electricity, metallurgy, pharmacy, etc. Its advantages are : light weight, high strength, corrosion resistant, safe, durable and so on. ...