What are the materials used for metal eyewear
The materials used for metal eyewear are divided into three categories: copper alloys, nickel alloys and precious metals. It is required to have a certain degree of hardness, softness, elasticity, abrasion resistance, corrosion resistance, light weight, luster and good color and so on. Therefore, the metal materials used to make metal frames and metal sunglasses are almost all alloys or used after metal surface processing. 1. Zinc-nickel alloy Also known as foreign silver or foreign silver. The main component is copper, which contains 64% copper, 18% nickel and 18% zinc, with a proportion of 8.8. It is characterized by a certain degree of corrosion resistance, good elasticity, low cost and easy processing. It is mainly used to make hinges, pile heads and nose bridges. Most low-end spectacle frames are made of zinc-nickel alloy. When used, it will rust and become copper-green after being corroded by human sweat. 2.Brass Also called copper-zinc alloy. Containing 63% t...