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Indium
In
Atomic weight 114.82

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Indium

Indium

Few people outside the world of chemistry know about the element indium; yet it is found playing a very important role in several commonly used products.

Indium is a soft, silver-white post-transitional metal, meaning its melting point of 156.6 degrees Celsius and boiling point of 2072 degrees Celsius are both lower than those of transitional metals. Due to this distance between melting and boiling points with indium, the element has an extraordinary large working liquid range.

Indium is also part of the alloy, galinstan, which is a non-toxic liquid at room temperature. This alloy is a combination gallium, indium and tin. 

There are several uses for indium that take advantage of its soft, malleable and ductile properties. The element is so soft (Mohs hardness 1.2) that it leaves a mark when drawn across a piece of paper, and can be cut into with a knife at room temperature. Due to its softness, it can be manipulated and easily drawn out into wire. One of the most common uses of indium wire is in high vacuum seals. As a wire, indium is also used as a thermal conductor in cryogenics and other ultra-high vacuums.

Indium’s low melting point lends it to being alloyed easily in solders. Another popular use for indium is in its foil form. Thin indium foil can be used as a conductive coating that is heated to fit between a heat-transfer surface of a microprocessor and heat sink.

Indium is also used in soldering, in order to provide a stress-free bond between a ceramic sputter target and a target holder. This bond is also electrical and thermal conducting. 

Indium is used for medical purposes as it emits a small amount of gamma radiation, which enables it to be used as a tracer throughout the body.

Although indium does not react with water, it can still be oxidized by other, stronger oxidizing agents like halogens, producing the indium(III) compounds like indium(III) oxide.

One of the most common uses for indium that appear in several commercial products is in the semiconductors and thin films used in the making of liquid crystal displays (LCDs). 

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Product line
number
MaterialDimensionsPurityDescription
IN1593Indium Foil 0.050 mm (thickness) High purity 99.999%IN5N
IN1606Indium Foil 0.080 mm (thickness) High Purity 99.999%IN5N
IN1602Indium Foil 0.10 mm (thickness) Purity 99.99% 
IN1592Indium Foil 0.10 mm (thickness) High Purity 99.999% 
IN1600Indium Foil 0.125 mm (thickness) Purity 99.99% 
IN1594Indium Foil 0.125 mm (thickness) High purity 99.999% 
IN1603Indium Foil 0.20 mm (thickness) Purity 99.99% 
IN1604Indium Foil 0.20 mm (thickness) High Purity 99.999% 
IN1598Indium Foil 0.25 mm (thickness) Purity 99.99+% 
IN1595Indium Foil 0.25 mm (thickness) High purity 99.999% 
IN1601Indium Foil 0.50 mm (thickness) Purity 99.99% 
IN1596Indium Foil 0.50 mm (thickness) High purity 99.999% 
IN1599Indium Foil 1.0 mm (thickness) Purity 99.99+% 
IN1597Indium Foil 1.0 mm (thickness) High purity 99.999% 
IN5220Indium Wire 0.25 mm (diameter) High Purity 99.999% 
IN5221Indium Wire 0.50 mm (diameter) High Purity 99.999% 
IN5227Indium Wire 0.60 mm (diameter) Purity 99.99+% 
IN5228Indium Wire 0.75 mm (diameter) Purity 99.99+% 
IN5223Indium Wire 1.0 mm (diameter) Purity 99.99+% 
IN5225Indium Wire 1.60 mm (diameter) Purity 99.99+% 
IN5226Indium Wire 2.0 mm (diameter) Purity 99.99+% 
IN5224Indium Wire 4.0 mm (diameter) Purity 99.99+% 
IN9008Indium Ingots Purity 99.99% 
IN9010Indium Ingots High Purity 99.999% 
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