Indium ingot is widely used as a gasket or lining material for high-altitude instruments and aerospace equipment because of its excellent malleability, low vapor pressure, and its ability to adhere to a variety of materials.

Indium is used in the atomic energy industry to make a neutron indicator. Any of many alloys of indium commonly used to make control rods in nuclear reactors. Indium is also an excellent material for making neutron detectors and is comparable to the metal gallium.

The initial industrial application of the metal indium was in the manufacture of industrial bearings, where it continues to be used today. The surface of the bearing is plated with indium, and the service life of the bearing is extended 5 times as much as that of the bearings with ordinary coating. Alloys of indium and gallium, which lubricate sliding components, are also used in electric vacuum instruments.

Indium is easy to form a solid coating on the metal surface and has good corrosion resistance, especially can prevent the corrosion of alkaline solution. The indium coating not only has a bright color but also is easy to polish. In addition to pure indium coating, indium and zinc alloy can also be used as coating. Indium plating is also used in the decorative process. All kinds of mirrors, reflectors and reflectors, if coated with indium, its reflective performance will be greatly enhanced and resistant to the erosion of sea water, so in the sea ship reflectors commonly used in this coating.

Because indium has a low melting point, many kinds of fusible alloys can be made with it. These indium-containing alloys, whose melting points range from 47 to 122℃, are used in a wide range of fuses, fuses, temperature controllers and signal devices.

Many fusible alloys of indium are used as brazing solder. Even the pure metal indium itself easily wets and adheres to the surfaces of glass, quartz and mica. Indium can be used to make piezoelectric parts welded together firmly. In the fabrication of multilayer integrated circuits, the selection of indium-containing brazing material is a very important step.