Four industrial powders: zinc borate (flame retardant), potassium carbonate ≥99% (alkali source for glass and chemicals), calcium stearate (lubricant and stabilizer for plastics), and barium sulfate in SF10E electronic grade (D50 0.7–1.1 μm for precision filling) and industrial grade. Used in plastics, rubber, coatings and electronic materials, available in bulk quantities.
Specifications
| Item | Formula | Purity / particle size | Main use |
|---|---|---|---|
| Zinc borate | 2ZnO·3B₂O₃·3.5H₂O | ZnO 37–40%; B₂O₃ 45–48%; particle size 3–5 μm; whiteness ≥95 | Flame retardant |
| Potassium carbonate | K₂CO₃ | Purity ≥ 99%; white anhydrous powder | Chemical alkali source |
| Calcium stearate | Ca(C₁₈H₃₅O₂)₂ | Industrial grade; melting point 155 °C; hydrophobic | Lubricant / stabilizer |
| Barium sulfate SF10E | BaSO₄ | D50 0.7–1.1 μm; moisture ≤0.2%; pH 7–9 | Electronic-grade filler |
| Barium sulfate (industrial grade) | BaSO₄ | Purity ≥ 98%; 25 kg/carton | Industrial filler |
Uses by industry
| Item | Plastics / rubber | Coatings | Electronic materials | Other |
|---|---|---|---|---|
| Zinc borate | Flame retardant additive | Fire-retardant coatings | PCB flame retardancy | Antifungal agent (wood) |
| Potassium carbonate | — | — | — | Glass flux, soap making |
| Calcium stearate | PVC heat stabilizer, mold release | — | — | Paper anti-sticking agent |
| Barium sulfate SF10E | Engineering plastic filler | Primer filler (low density) | PCB substrate filler | — |
| Barium sulfate, industrial | Rubber filler | Primers / topcoats | — | Raw material for X-ray contrast agents |
Common questions
Which barium sulfate grade is for electronic materials? SF10E electronic grade (D50 0.7–1.1 μm), used as filler in engineering plastics and PCB substrates.
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