... : steel Self-light weight, low cost Standard: ASTM Shape: Z section Z steel purlin 1.Thickness:0.5mm to 3.0mm 2 ... in factory buildings, large-span bridges, gymnasiums and portable houses. Z steel purlin may be used in single spans and continuous ... ) Manufactured from high tensile galvanized steel.2) Despotic C&Z section steel, Z section steel is roll-formed from galvanized steel, specification ...