Sodium nitrate, the English called sodium nitrate, a chemical formula NaNO3, 85.01 molecular weight, melting point 306.8 degree, density of 2.257 grams / cubic centimeter (20degree ), the colorless, transparent or white microstrip yellow diamond crystal. The bitter taste salty, easily soluble in water and liquid ammonia, slightly soluble in glycerol and ethanol, easy deliquescence, especially in the presence of a very small amount of impurities in sodium chloride, sodium nitrate deliquescence on the greatly increased. When heated, sodium nitrate into easily break down into sodium nitrite and oxygen. Combustion of sodium nitrate can be stored in a cool well ventilated place.