... fitting Materials in C45,40Mn2, ductile iron Mechanical class 40kN - 210kN polymer insulator fitting1.Materials in C45,40Mn2, ductile iron2.Mechanical ... class 40kN - 210kN3.Hot galvanized coating protection against corrosion4.Materials testing ... 60383, ISO 14713, 1461, ASTM A123, A153 polymer composite insulator end fitting