1. Product Information
Product name: Sodium Stannate Trihydrate
CAS No.:12209-98-2
EINECS No.:235-030-5
Chemical Formula:Na₂SnO₃·3H₂O
Molecular Weight:266.73
Synonyms:Disodium stannate trihydrate, Sodium tin(IV) oxide trihydrateAppearance: White crystalline powder, odorless
Product Type: Inorganic tin salt, electroplating raw material, industrial chemical
2. Physical & Chemical Properties
Melting Point 140 °C (decomposition)
Solubility Soluble in water; insoluble in ethanol, acetone
pH (aqueous solution) ≈11.5 (alkaline)
Stability Hygroscopic. Stable under normal conditions. Avoid strong acids, moisture. Decomposes at high temperature.
Corrosive.
3. Quality Specification (Industrial Grade)
| Test Item | High Grade | Industrial Grade |
|---|---|---|
| Sn Content | ≥42.0 % | ≥36.5 % |
| Pb | ≤0.002 % | ≤0.002 % |
| Sb | ≤0.0025 % | ≤0.002 % |
| As | ≤0.001 % | ≤0.002 % |
| Fe | ≤0.02 % | ≤0.02 % |
| Free NaOH | ≤3.5 % | ≤4.5 % |
| Alkali‑insoluble matter | ≤0.1 % | ≤0.2 % |
4. Applications
Electroplating: Main raw material for alkaline tin-plating, tin-alloy plating for metal surface treatment.
Ceramic & glass: Used as opacifier and modifier for ceramic glaze and glass production.
Textile: Flame-retardant additive for textile finishing.
Others: Catalyst, corrosion inhibitor and raw material for tin-based chemical synthesis.
5. Packaging, Storage & Transportation
- Packaging: 25 kg fiber drum / plastic drum.
- Storage: Keep tightly sealed. Store in cool, dry, ventilated warehouse. Prevent moisture and humidity. Keep away from acid agents.
- Transport: Alkaline corrosive solid. Avoid rain and damp environment.
6. Safety Remarks (Refer to SDS for full details)
- Corrosive to skin, eyes and respiratory tract. Wear chemical-resistant gloves and safety goggles.
- In case of contact, rinse with plenty of clean water.
- Fire-extinguishing media: dry powder, carbon dioxide, water spray.
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