Tin is a group 14, period 5, p-block element with relative atomic mass 118.71. Elemental tin can exist in four allotropes. beta-tin (metallic, white tin) is soft and malleable, around 13.2 degrees centigrade beta-tin begin to transform to alpha-tin (grey tin) which has none of the metallic properties owing to a covalently bonded structure, and is a powdery material. Other allotropes exist at temperatures and pressures far above standard. It should be noted that impurities and additions of other elements reduced the temperature at which allotrope transition occurs and with bismuth or antimony addition, the alpha transformation may not occur at all.
Tin (metallic, beta) finds uses in coatings, to prevent corrosion as in tin plated steel cans, and because it takes a high polish. Tin is alloyed with niobium for use in superconducting magnets, and is also used in soft and lead free solder, and found in pewter, and bronze. In window glass manufacture molten tin is used as a float. Tin chemicals such as tin (II) chloride are used in the dye industry, tin (IV) oxide is used in the ceramics and sensor industry, and in Plastics industry zinc tin oxide is used as a flame and smoke retardant. Alpha tin has few applications save for limited uses in semiconductors.
Traded tin products are priced with reference to one of the exchange prices; we use the London Metal Exchange prices which are for a metric tonne of 99.85% minimum purity tin (BS EN 610:1996 standard) in warehouse. The price paid by a buyer will depend on the quality of tin, the format and the location, with adjustments made over or under the exchange price depending on these factors.
Our traded tin is LME brand registered tin ingots; toll converted or produced by Malaysia Smelting Company Berhad, typically 99.85% min Sn content. In addition we can supply higher purity South-East Asian origin tin ingots and wire.