Physical and chemical properties：
Sodium stannate usually exists in the form of sodium stannate trihydrate (Na₂SnO₃·3H₂O). It is a colorless hexagonal crystal. Due to the presence of [Sn(OH)₆]²⁻ in its solution, the chemical formula of sodium stannate can also be expressed as Na₂[Sn(OH)₆]. At 140℃, sodium stannate trihydrate loses water to become anhydrous sodium stannate. Sodium stannate is prone to hydrolysis to form stannic acid (xSnO₂·yH₂O), and it will turn into β-stannic acid when left standing and heated. Sodium stannate can be obtained by treating cassiterite (SnO₂) with molten caustic soda or soda ash.
Applications：
Sodium stannate can be used as a mordant, a fire retardant and weighting agent for textiles, as well as in the production of glass, ceramics and tin plating, etc.
| Specifications | Electroplating | |
|---|---|---|
| Packing: | 25kg/drum, in plastic or iron drums with inner bag,or as customer's requirements. | |
| Appearance | Clear liquid | |
| Assay(Na2SnO3·3H2O) % | ≥98 | |
| Sn % | ≥42 | |
| Fe % | ≤0.005 | |
| As % | ≤0.001 | |
| Pb % | ≤0.002 | |
| Heavy metal(as Pb) % | ≤0.005 | |
| Sulfate（SO4) % | ≤0.3 | |
| Acid insoluble % | ≤0.05 | |
Transportation conditions: It is strictly prohibited to mix and transport with oxidants, acids, edible chemicals, etc. During transportation, exposure to sunlight, rain, and high temperatures should be prevented. The vehicle should be cleaned after transportation. For road transportation, it shall follow the specified route. Air transportation:Sodium stannate can be handled under ordinary cargo conditions.
Storage conditions: It should be stored in a cool and dry place. Attention should be paid to protecting it from sunlight, moisture and package damage. It is recommended to stack it on shelves or single-layer pallets.
Shelf life: Under the above storage and transportation conditions, the shelf life is 12 months.
