... is acceptable 5Usage:steel structure build Metal roofing z purlinsC /Z Purlin Heavy load bearing capacity: High strength and ... from high tensile galvanized steel.2) Despotic C&Z section steel, Z section steel is roll-formed from galvanized steel ... 0.5mm to 15mmMaterialQ235,Q195,Q345Sizelength,width,thickness,height can manufacture as you requestSurface Treatmenthot dipped galvanized, ...