What are the materials used for metal eyewear

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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.

metal eyewear materials

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% to 65% copper and 35% to 37% zinc, it is yellow. The advantage is that it is easy to cut and the disadvantage is that it is easy to change color. Commonly used in low-end spectacle frames and nose pad cores.


3. Copper-nickel-zinc-tin alloy

It is an alloy composed of 62% copper, 23% nickel, 13% zinc, and 2% tin. It has good elasticity and is often used in the nose bridge and temples of spectacle frames after electroplating.


4. Bronze

Generally refers to a copper-tin alloy, and contains a small amount of zinc and phosphorus. Because bronze contains a certain amount of tin, the price is relatively high. Its disadvantages are difficult processing and poor corrosion resistance to acids, but it has good elasticity, diamagnetism, and abrasion resistance. Human body corrosion resistance is better than copper and brass, so it is suitable for spring and lens ring materials for metal frames.


5. Monel alloy

Belongs to a kind of nickel-copper alloy. The specific gravity is 8.9, and it contains 63% to 67% nickel, 28% to 31% copper, and a small amount of iron and manganese. It is characterized by no chromium, and because of its high nickel content, it has the advantages of good strength, elasticity, corrosion resistance and firm welding, so it is often used to manufacture mid-range metal eyewear.


6. High nickel alloy

Also known as nickel alloy. The proportion is 8.67, containing 84% nickel, 12.5% chromium, 5% silver, 1% copper and other elements. It is a high-grade nickel-chromium alloy material, which is more elastic and corrosion resistant than Monel.


7. Stainless steel

It is a kind of nickel-chromium alloy. It mainly contains more than 70% of iron, 18% of chromium, 8% of nickel, and 0.1% to 0.3% of other elements. It has good elasticity and corrosion resistance, and is mostly used as temple materials. Stainless steel materials containing 1% to 1.5% lead are mostly used to make screws or base materials for gold-clad frames.


8. Gold and its alloys

Pure gold is golden yellow with a specific gravity of 19.3. It is one of the heaviest metals and will not be corroded and oxidized in the atmosphere. Gold is softer than silver and has good grindability. Therefore, pure gold is generally not used as the material for spectacle frames, but alloys of gold, silver and copper are used.

The gold content of the alloy is generally represented by "K". 24K is 100% pure gold, and the alloys of K18, K14 and K12 are mostly used for spectacle frame materials. The content of pure gold is respectively: K18: 18/24×100=75%; K14: 14/24×100=58. 3%; K12: 12/24×100=50% and so on.


9. Aluminum alloy

Pure aluminum is relatively soft and silvery white, generally aluminum alloy. Aluminum alloy is light in weight, good in corrosion resistance, has a certain hardness, and has good cold forming characteristics. The surface is treated into a thin and hard oxide layer, which can be dyed into various colors. At present, aluminum alloy is used for the gaskets at the joints of the temples of the titanium eyewear, and there are also aluminum eyewear made of aluminum alloy for the whole pair of glasses.


10. Memory metal

Also known as memory titanium gold or NT alloy, it is synthesized by mixing with titanium and nickel after high temperature treatment. It has the advantages of being lighter and super-elastic than ordinary titanium alloys.

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