Four industrial-grade crystalline raw materials: zinc sulfate ZnSO₄·7H₂O (zinc plating salt), copper sulfate CuSO₄·5H₂O ≥99% (main salt for copper plating), sodium tungstate Na₂WO₄·2H₂O (flame-retardant additive) and sodium bisulfite NaHSO₃ ≥95% (reduction and dechlorination). All come in 20–25 kg cartons, with heavy metal impurities controlled.
Specifications
| Item | Formula | Purity / main content | Impurity limits | Packaging |
|---|---|---|---|---|
| Zinc sulfate | ZnSO₄·7H₂O | Zn ≥ 22% | Fe ≤ 20 ppm, Pb ≤ 10 ppm, Cl ≤ 10 ppm | 25 kg/carton |
| Copper sulfate | CuSO₄·5H₂O | ≥ 99%; Cu ≥ 25% | Fe ≤ 0.01%, Pb ≤ 10 ppm | 20 kg/carton |
| Sodium tungstate | Na₂WO₄·2H₂O | WO₃ ≥ 68% | Crystalline, no caking | On request |
| Sodium bisulfite | NaHSO₃ | ≥ 95%; SO₂ equivalent 58.5–64% | Fe ≤ 50 ppm; pH 4.0–4.8 (10% solution) | 20 kg/carton |
Common questions
Which salt is used for copper plating? Copper sulfate CuSO₄·5H₂O (≥99%, Cu ≥ 25%) is the main salt for copper plating.
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