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| "Synonyms:Sodium stannate trihydrate Anhydrous sodium stannate Electroplating Grade Sodium Stannate Technical Grade Sodium Stannate Disodium stannate Sodium tin oxide Molecular Formula:Na2O3Sn/Na2SnO3·3H2O Molecular Weight: 212.69 HS Code: 2841900090 Grade:42% Hazard Class:General Cargo" | |||||||||
12058-66-1
bosschemical
12058-66-1
1. Product Overview
Sodium stannate (Na₂SnO₃) is the disodium salt of stannic acid — a white, crystalline, strongly water-soluble tin source supplied as the trihydrate. It is the principal salt of alkaline tin electroplating, where its stannate ion delivers smooth, dense, corrosion-resistant tin coatings onto steel, copper and electronics components.
Beyond the plating bath, sodium stannate is a proven textile fire retardant and weight-gainer, a heat stabilizer for plastics, a mordant and ceramic/glass auxiliary, and the starting material of other tin chemicals. One salt carries tin into electrochemistry, textiles, polymers and ceramics — the soluble face of tin chemistry.
A single salt, four core value propositions:
Alkaline Tin Plating:
● the standard salt of alkaline (stannate) tin and tin–alloy electroplating baths;
Flame Retardancy:
● a fire-retardant and weight-increasing agent for flame-resistant textiles and polymers;
Stabilizers & Tin Compounds:
● a heat stabilizer for plastics and the raw material of tin oxide and other tin chemicals;
Ceramics, Glass & Specialty:
● a mordant, ceramic/glass auxiliary, coating and analytical reagent.
2. Product Information (Quick Facts)
Item | Specification |
Chemical Name | Sodium stannate (Disodium stannate) |
Synonyms | Disodium tin trioxide; Sodium tin(IV) oxide; Stannate (SnO₃²⁻), disodium; Sodium hexahydroxostannate(IV) (hydrate form) |
CAS No. | 12058-66-1 (anhydrous); 12027-70-2 (trihydrate) |
EC No. (EINECS) | 235-030-5 |
Molecular Formula | Na₂SnO₃ (trihydrate Na₂SnO₃·3H₂O) |
Molecular Weight | 212.69 g/mol (anhydrous); 266.73 g/mol (trihydrate) |
Appearance | White to pale-yellow crystalline powder |
Solubility | Freely soluble in water (alkaline solution); insoluble in alcohols |
3. Chemistry & Forms
Sodium stannate is built from sodium cations and the stannate anion (SnO₃²⁻), in which tin is in its +4 oxidation state. In aqueous solution it is strongly alkaline (pH ≈ 11 – 12), and in plating it is the stannate ion itself that is reduced at the cathode to metallic tin — giving the dense, uniform deposits characteristic of alkaline stannate baths. The trihydrate (Na₂SnO₃·3H₂O) is the standard commercial form, freely soluble in water.
4. Key Features & Benefits
● Dense, corrosion-resistant deposits: alkaline stannate plating gives smooth, adherent tin coatings on steel, copper and electronics.
● Effective flame retardancy: imparts fire resistance to textiles and polymers, with weight-gaining action.
● Clean heat-stabilizing action: stabilizes PVC and other plastics against thermal degradation.
● Multi-industry reach: electroplating, textiles, polymers, ceramics, glass and tin-chemical manufacture.
● Full traceability: COA with every batch documenting assay and key impurities.
5. Main Applications
5.1 Alkaline Tin Plating (Core Application)
Sodium stannate is the salt of choice for alkaline tin electroplating:
● Alkaline (stannate) tin plating: main salt for smooth, dense tin deposits on steel, copper and brass;
● Food and can manufacturing: protective tin coatings on food-contact steel;
● Electronics and connectors: solderable tin and tin–alloy coatings;
● Tin–copper (bronze) and tin–zinc alloys: alloy plating systems based on stannate baths.
5.2 Flame Retardancy & Textile Treatment
● Fire-resistant textiles: flame-retardant treatment of fabrics, curtains and protective clothing;
● Weight-increasing agent: adds weight and hand-feel to textile goods;
● Polymer flame retardancy: fire-retardant additive in plastics and coatings.
5.3 Stabilizers & Tin Compounds
● Plastics heat stabilizer: thermal stabilization of PVC and other polymers;
● Tin chemical manufacture: raw material for tin oxide, tin salts and organotin intermediates;
● Catalyst applications: tin source in specialty catalysis.
5.4 Ceramics, Glass & Specialty Applications
● Ceramics and glass: auxiliary in glazes, enamels and glass processing;
● Mordant: dye-fixing mordant in textile and leather processing;
● Surface coatings: component of paper and specialty coatings;
● Analytical reagent: tin standard and laboratory reagent.
6. Packaging, Storage
Packaging (customizable):
● 25 kg multi-wall paper bag with PE liner, 25 kg fiber drum, or 500 kg – 1,000 kg FIBC;
Storage:
● Keep in a cool, dry, well-ventilated area away from direct sunlight and heat;
● Keep containers tightly closed to prevent moisture pick-up and caking;
● Store away from acids and incompatible materials (alkaline salt);
● Recommended storage temperature 5 °C – 35 °C.
● Factory-direct supply: own production capacity, transparent pricing, no middleman markup;
● Stable quality: strict internal control, every batch tested, COA with every shipment; small trial orders accepted.
● Export experience: familiar with sea/air shipping documentation for chemical commodities, complete paperwork support;
Sodium stannate is the standard salt of alkaline tin electroplating, giving dense, corrosion-resistant tin and tin-alloy coatings on steel, copper and electronics. It is also a fire-retardant and weight-gaining agent for textiles, a heat stabilizer for plastics, a ceramic/glass auxiliary and mordant, and the raw material of tin oxide and other tin chemicals.
The two are different tin oxidation states and plating chemistries: sodium stannate carries tin(IV) as the stannate ion (SnO₃²⁻) and is used in alkaline tin plating; stannous chloride carries tin(II) (Sn²⁺) and serves acid tin baths, sensitizing and reducing chemistry. Alkaline stannate baths give dense, corrosion-resistant deposits, while acid baths plate faster with better throwing power — each suits different applications.
Sodium stannate solution is strongly alkaline and can cause skin and eye irritation or burns, and the powder can irritate the respiratory tract; tin compounds have low acute toxicity but chronic exposure should be controlled. Use gloves, goggles and dust protection, avoid contact with acids, and prevent release to the environment. It is an industrial chemical, not a food ingredient.
