It is required to have certain hardness, softness, elasticity, wear resistance, corrosion resistance, light weight, luster and good color and so on. Therefore, the metal materials used to make optical frame are almost all alloys or used after the metal surface is processed. The main components are copper 64%, zinc 18%, nickel 18%, the frame material is the cheapest and easy to process. Electroplating is mainly used to manufacture hinge support wire, etc., small parts and low-grade frames. The nickel content is as high as 80% or more, mainly including nickel-chromium alloys, manganese-nickel alloys, etc. High-nickel alloys have better corrosion resistance, and in addition, the material has good elasticity.

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Nickel-copper alloy, the nickel content reaches about 63% copper and 28%, in addition to iron, manganese and other small amounts of metals, especially: corrosion resistance, high strength, strong welding, the most used material for mid-range racks. The specific gravity of titanium is only 4.5, it is very corrosion-resistant, and its strength is twice that of steel. It is used to make space shuttle cases, etc. It is called "space metal", and there is no metal allergy. Early titanium materials have difficulties in cutting and welding. Problems, with the development of technology, these problems have been gradually solved in the Japanese market, titanium materials have become mainstream, and titanium materials in the European and American markets are also mainly from Japan.

Titanium frames are generally expressed as Ti-P or TiTAN, and are basically made of titanium except for supporting wires, hinges, and screws. It refers to a new alloy composed of nickel and titanium in an atomic ratio of 1:1, which is 25% lighter than ordinary alloys and has the same corrosion resistance as titanium, and has very good elasticity. Memory titanium alloy: it exhibits shape memory characteristics below 0 °C, and high elasticity between 0 and 40 °C. -Titanium is slightly inferior. Refers to a special alloy formed by mixing pure titanium (70%) with rare metals such as cobalt and chromium (30%). The ultra-light and ultra-elastic frames can be made very thin.

Since it is an alloy of titanium and rare metals such as cobalt and chromium, it is very stable and will not cause skin allergies. In the next few decades, there will be greater development and popularization. The process is to add solder or direct mechanical bonding between the surface metal and the substrate. Compared with electroplating, the surface metal layer of the clad material is thicker, and it also has a bright appearance, good durability and corrosion resistance. Representation of gold-clad number: According to the regulations of the International Precious Metals Conference, products with a weight ratio of gold and alloy above 1/20 are represented by GF, and products below 1/20 are represented by GP.