What Is The Use Of Low Temperature Alloys That Can Be Melted By Hot Water?

117F 47C alloy（Cerrolow 117） is also called bismuth tin lead indium cadmium alloy. Because indium has the special property of infiltrating glass and ceramics, the low melting point alloy containing indium is a good bonding agent between glass, ceramics and metals and sealing material. 47C alloy has the lowest melting point and is cheaper than other indium alloys. Therefore, 47C low temperature alloys are widely used in spectacle lenses, optical lenses, gem grinding and other industries.

When grinding the lens blank, it is necessary to fix the auxiliary fixture with the lens blank with a 47C alloy to ensure that it will not move during grinding. Generally, the alloy is heated to a constant temperature of 50℃, and the alloy is cast between the lens blank and the fixture by machine equipment or manually. After the alloy cools, the lens is firmly adhered to the fixture, and then placed in a professional grinding machine. After grinding, put it in hot water, the alloy melts, the lens and the fixture are separated, the alloy sinks to the bottom, and the water is poured out to recover the alloy and it can be used repeatedly.

47C alloy is also widely used in other fields, such as acetylene gas cylinder valve safety device, etc.