1. The pipe fitting surface treatment: A. Black (as cast) B. galvanized (hot dip zinc coating) C. epoxy painting (250-300 microns) 2. Performances: Mechanical properties: Tensile strength equal or more than 33kg / mm2 Elongation rate equal or more than 8% Hardness equal or less than hb150 Hydrostatic test: Test pressure: 25kg / cm2 Working pressure: 16kg / cm2