Magnesia is a new type of environmental protection product for air duct. which is the replace-ment of traditional steel pipe, cast iron pipe and cement pipe. The utility model has theadvantages of low cost, light weight, high strength, corrosion resistance and long service life:Low water resistance and energy consumption; Non-toxic and pollution-free; Convenienttransportation and installation; lts service life is 50-70 years, five times that of traditionalpipes. its weight is only one tenth of that of cement pipes, and its comprehensive cost is lowerthan that of steel pipes prestressed concrete pipes and prestressed steel cylinder concretepipes. lts advantages have been gradually recognized by design unitsand users.

Physical and chemical indicators