Calcium nitrite [CAS 13780-06-8] [Chinese name] calcium sulfite, calcium nitrite, calcium nitrite monohydrate [EINECS number 237-424-2] [Formula] [Category] CaN2O4 inorganic chemical products: inorganic: Cl nitrate [nature] Appearance colorless or slightly yellow crystals, deliquescence. 】 【Solubility soluble in water. [Density] applications [2.23] can be used as a concrete use antifreeze, early strength agent, corrosion inhibitor of the main raw material mainly used as the main raw material of cement concrete admixtures, concrete can be configured as antifreeze, corrosion inhibitor, early strength agent. 1, antifreeze: You can reduce the freezing point of mixing concrete, construction temperature as low as -25 ° C in the negative temperature conditions, can promote the mineral components of the cement hydration reaction, chlorine-free is the new generation of low-alkali antifreeze . 2, corrosion inhibitor: The steel has excellent passivation rust and protection, concrete added 2-3% calcium nitrite can make buildings, structures extend the life of 20-50 years. 3, can be configured to compound early strength agent; improve the strength of concrete, reduce the amount of cement, shorten the construction period. Fundamentally overcome the concrete alkali aggregate reaction and electrochemical corrosion defects, improving the physical and mechanical properties and durability of concrete, to obtain high-quality concrete. [B] the use of reinforced concrete is widely used in engineering, as cement hardening accelerator and antifreeze rust inhibitor, concrete every 2% calcium nitrite, so that the life of the building constructed of reinforced concrete structures can be increased by 15 to 20 years. For the pharmaceutical industry, organic synthesis lubricants and corrosion inhibitors. [Use] 1) the use of concrete building calcium nitrite or member, and other materials can be formulated into a liquid or powder, it can be used directly 2) when dissolved calcium nitrite, preferably with warm water 30-35οC stirred to promote Asia rapid dissolution of calcium nitrate. 3) long-term storage or moisture damage inside the bag, will form a loose agglomeration, but does not affect the quality of calcium nitrite. [Reference Quality standards Index Name Index of industrial grade calcium nitrite [Ca (NO2) 2 · H2O] /% ≥ 98.5 copper (Cu) /% ≤ 0.001 sodium (Na) /% ≤ 0.01 Lead (Pb) /% ≤ 0.001 manganese (Mn) /% ≤ 0.0004 Ammonia (NH3) /% ≤ 0.008 sulfate /% ≤ 0.008 Chloride /% ≤ 0.05 Water Insoluble /% ≤ 0.04 pH value (5% solution) 8.5 6 ~