Certificate of Analysis-COA
Test Item | Unit | Specification Requirement | Actual Test Result | Test Method |
Main Content (as Sn) | % | ≥ 42.0 | 42.69 | XRF Spectrometer |
Iron (Fe) | % | ≤ 0.02 | 0.0021 | XRF Spectrometer |
Lead (Pb) | % | ≤ 0.0020 | 0.0003 | XRF Spectrometer |
Arsenic (As) | % | ≤ 0.0010 | 0.0002 | XRF Spectrometer |
Antimony (Sb) | % | ≤ 0.0025 | 0.0014 | XRF Spectrometer |
Free Alkali (Calculated as NaOH) | % | ≤ 3.5 | 0.26 | Neutralization Titration |
Appearance | — | White or light tan powder | White powder | Visual Inspection |
Applications
1. For Tin And Tin-Alloy Electroplating: Sodium stannate (Na2SnO3, CAS 12058-66-1) is the primary tin source in alkaline tin plating baths, producing uniform, dense, corrosion-resistant and solderable tin coatings on steel, aluminum and copper-based components, including tin-zinc and tin-copper alloy plating.
2. For Immersion And Cyanide-Free Plating: Sodium stannate supports immersion tin plating on aluminum alloy parts and enables cyanide-free electroplating systems, meeting modern environmental and safety requirements while maintaining bright, high-quality deposits.
3. For Textile Flame Retardant Finishing: As a textile fireproofing agent, sodium stannate imparts durable flame-retardant properties to fabrics in finishing processes, supporting fire safety in industrial and commercial textile applications.
4. For Industrial And Chemical Applications: The compound is used as a hydrogen peroxide stabilizer, dyeing mordant and chemical intermediate for tin compounds, catalysts and pigments, giving formulators a versatile tin source for diverse processes.
5. Reliable Supply For Global Industry: Supplied as high-purity trihydrate crystals and powder with consistent quality, sodium stannate gives electroplating, textile and chemical manufacturers a dependable tin chemical with stable supply, flexible packaging and professional technical support.
Quality Assurance
Every batch of chemicals leaves our factory with complete laboratory documentation — not a promise, but verifiable test data. From incoming raw material inspection to finished-goods release, each batch is tested against published specifications, and a Certificate of Analysis (COA) accompanies every single shipment. What you order is exactly what we test — and what we ship.
Tested by our in-house ISO 9001:2015 laboratory. Verified independently by third-party labs on request (SGS / BV / Intertek). Traceable from raw material to your warehouse.
Packaging
Woven bags
Kraft paper bags
Big bags
Export-grade packaging, custom labels
Solids (woven bags/cardboard drums/ton bags)
Liquids (plastic drums/IBC/ISO tanks)