Antimony is a chemical element with the symbol Sb (Latin: stibium, meaning "mark") and atomic number 51. A metalloid, antimony has four allotropic forms. The stable form of antimony is a blue-white metalloid. Yellow and black antimony are unstable non-metals.

Antimony in its elemental form is a silvery white, brittle, fusible, crystalline solid that exhibits poor electrical and heat conductivity properties and vaporizes at low temperatures. Antimony is used in electronics and flame-proofing, in paints, rubber, ceramics, enamels, drugs to treat Leishmania infection and a wide variety of alloys.

Particular	Test Specification
Appearance	Silver white lustrous metal
Antimony (Sb)	99.9% max
Arsenic (As)	0.005% max
Iron (Fe)	0.0002 max
Sulphur (S)	0.001% max
Lead (Pb)	0.005% max
Selenium (Se)	0.0005% max

Sodium Antimonate is used in the Glass Industry as a fining agent or degasser, especially in colour television bulbs and optical glass. Sodium Antimonate Hexahydrate is used for the production of Colloidal Antimony Pentaoxide used as a flame retardant. It is also used for the production of extremely high purity Antimony Metal and subsequently high purity Antimony Trioxide.

When used with halogen, usually chlorine, Sodium Antimonate is a fire retardant with very low tinting characteristics. As such it is used in plastics, paints, fibre glass resins and various textile goods.

Particular	Test Specification
Antimony Pentoxide	64.00% min
Sodium Oxide	12.00% max
Lead Oxide	0.20% max
Iron Oxide	0.10 max
Copper Oxide	0.01% max
Chromium Oxide	0.02% max
Metal Oxide	0.01% max
Moisture	0.30% max

Particular	Test Specification
Appearance	White Crystals
Antimony (Sb)	40.0 -42.0%
Chloride	0.01% max
Iron (Fe)	0.002% max
Colour APHA of 3% solution in MEG	0.20% max