Aluminum Alloy: Aluminum Alloy (铝合金)
A light metal alloy used for zipper teeth and sliders where weight reduction matters. Aluminium has low density and good corrosion resistance when anodised, and it can be coloured by anodising instead of plating. It is softer than brass, so tooth strength and wear resistance are lower and design must account for load. Alloy grade, temper and anodising thickness are specified and checked for appearance and durability.