Tin dioxide
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Tin dioxide, SnO2, also tin(IV) oxide, stannic oxide, tin peroxide, stannic anhydride, and flowers of tin, is an oxide of tin, with tin in oxidation state +4. It has the appearance of a white powder with melting point of 1127 °C and specific gravity 6.95 g/cm3. Its CAS number is CASREF|CAS=18282-10-5}} and its EINECS number is 242-159-0. It is insoluble in water and soluble in concentrated sulfuric acid. It can be prepared by reaction of tin and concentrated nitric acid at high temperature.
The naturally occurring mineral is called cassiterite.
When hydrated, it may be called stannic acid.
See stannic acid for more chemistry.
Tin dioxide is used as a catalyst and a polishing powder for steels and other metals, glasses, and metallic dental restorations. [1]
Tin dioxide is used in sensors of combustible gases. The sensor area is heated to constant temperature (low 100s °C); in presence of a combustible gas its electrical resistivity drops.
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