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High-purity, crystalline solid with consistent stoichiometry and low heavy metal impurities.
Excellent solubility in water, enabling uniform dispersion in aqueous-based formulations.
Thermally stable up to 100 °C under controlled conditions, supporting safe handling and storage.
Non-volatile and non-flammable—meets standard industrial safety requirements for inorganic tin compounds.
Acts as a reliable source of stannate ions (SnO₃²⁻) for controlled tin release in functional coatings and plating baths.
Electroless tin plating baths for printed circuit board (PCB) surface finishing and solderability enhancement.
Anticorrosive pigment component in waterborne primers for steel and aluminum substrates.
Flame-retardant synergist in intumescent coatings for structural steel protection.
Stabilizer in transparent conductive oxide (TCO) precursor solutions for thin-film deposition.
Catalyst precursor in selective oxidation reactions within fine chemical synthesis processes.
| Chemical Type | Inorganic tin(IV) salt — potassium stannate trihydrate (K₂SnO₃·3H₂O) |
| Product Form | Crystalline powder or granular solid |
| Appearance | White to off-white, free-flowing crystals |
| Melting Point | Decomposes above ~150 °C (loss of hydration followed by decomposition) |
| Primary Applications | Electroless plating, corrosion inhibition, flame retardancy, catalyst synthesis |
| Key Features | High SnO₃²⁻ availability, low chloride/sulfate content, batch-to-batch reproducibility |
| Benefits | Improved bath stability, reduced sludge formation, enhanced coating adhesion and uniformity |
| Regulatory Compliance | REACH registered; SDS available; not classified as SVHC under current ECHA list |
| Common Compatible Systems | Suitability |
| Aqueous alkaline plating baths (pH 12–14) | Highly Recommended – Maintains ion stability and minimizes hydrolysis |
| Waterborne acrylic and epoxy anticorrosive primers | Recommended – Requires pH adjustment to ≥10.5 for optimal dispersion |
| Intumescent acrylic/latex fire-retardant coatings | Suitable – Functions effectively as synergist with ammonium polyphosphate |
| Alkaline cleaning and passivation solutions | Recommended – Enhances protective oxide layer formation on aluminum alloys |
Q1: What is the CAS Number for Potassium Stannate Trihydrate?
A: The CAS Registry Number is 13197-28-5.
Q2: What is the typical dosage range in electroless tin plating baths?
A: Standard concentration is 30–60 g/L, depending on bath temperature, pH (12.5–13.5), and desired deposition rate; optimization via small-scale trials is recommended.
Q3: How does Potassium Stannate Trihydrate compare to Sodium Stannate in performance?
A: Potassium stannate offers superior solubility and lower sodium-induced stress cracking risk in sensitive electronic coatings; it also provides better long-term bath stability due to reduced carbonate precipitation.
Q4: Is Potassium Stannate Trihydrate compliant with RoHS or EU food contact regulations?
A: It is RoHS-compliant (exempted for industrial applications per Annex III); however, it is not approved for direct food-contact applications under EC 10/2011 due to tin migration limits.
Q5: Can tin migrate from coatings containing this compound under humid or acidic conditions?
A: Migration is minimal under neutral to alkaline conditions; however, prolonged exposure to pH < 5 or high humidity (>85% RH) may accelerate leaching—formulation with silane coupling agents or barrier resins is advised for critical environments.
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