Key Specifications
Headline parameters — full spec sheet on CoA.
| Parameter | Value | Unit |
|---|---|---|
| Purity | ≥ 99.95 | % ZnO |
| D50 | 0.3 – 0.8 | μm |
| Pb | ≤ 5 | ppm |
| Cd | ≤ 3 | ppm |
Full Specification
CAS 1314-13-2 · EINECS 215-222-5 · Indirect process · Verified Chinese manufacturer.
| Parameter | Value |
|---|---|
| Appearance | Loose white powder, free of mechanical contamination |
| ZnO Content | ≥ 99.95% |
| Loss on Ignition (950 °C) | ≤ 0.20% |
| Acid Insoluble Matter | ≤ 0.005% |
| Water Soluble Salts | ≤ 0.05% |
| Lead (Pb) | ≤ 5 ppm |
| Cadmium (Cd) | ≤ 3 ppm |
| Iron (Fe) | ≤ 10 ppm |
| Manganese (Mn) | ≤ 1 ppm |
| Copper (Cu) | ≤ 2 ppm |
| D50 (laser diffraction) | 0.3 – 0.8 μm |
| D90 | ≤ 2 μm |
| BET Surface Area | 5 – 10 m²/g |
| Sieve Residue (45 μm) | ≤ 0.01% |
| pH (5% aqueous slurry) | 6.8 – 7.5 |
| Packaging | 25 kg PE-laminated kraft bag · 500 kg FIBC option |
Application Details
+Multi-Layer Varistor (MLV) & MOV Surge Arrestor
Used as the dominant matrix (≥ 90 wt%) in ZnO-based varistors. Heavy-metal control is critical — Pb and Cd disrupt the grain-boundary breakdown behavior that defines the V-I curve. Particle size tuning (D50 0.3 – 0.5 μm) determines firing density and final breakdown voltage. Typical co-additives: Bi₂O₃, Sb₂O₃, MnO₂, Co₂O₃.
+Ferrite Core Production
Used at 1 – 5 wt% as a sintering aid for Ni-Zn and Mn-Zn ferrites. Low Fe contamination (≤ 10 ppm) prevents unwanted magnetic phase formation. Stable D50 ensures consistent shrinkage during sintering.
+SAW Filter & Piezoelectric Substrate
ZnO thin films deposited on LiNbO₃ or LiTaO₃ substrates. Bulk ZnO powder feedstock requires ≥ 99.95% purity with minimal alkali residue (Na, K ≤ 5 ppm on request).
+Phosphor and LED Encapsulant
As a UV scattering and stabilizing additive in LED encapsulants. Used at 0.1 – 1 wt% — requires very low D90 (≤ 2 μm) to avoid haze.
Frequently Asked Questions
+What grade-level ICP-MS data can you share?
Full 16-element ICP-MS scan available on signed NDA — covers Pb, Cd, As, Hg, Cr, Ni, Fe, Mn, Cu, Co, Sb, Bi, Sn, Tl, Na, K. Standard CoA covers the 5 most-watched elements (Pb, Cd, Fe, Mn, Cu).
+Can you guarantee Pb below 3 ppm?
Yes — tighter spec of Pb ≤ 3 ppm is available as a custom production run at an MOQ of 5 MT. Standard ≥ 99.95% grade ships at Pb ≤ 5 ppm.
+What firing density and shrinkage should we expect at 1100 °C?
Typical sintered density 5.5 – 5.65 g/cm³ (96 – 99% theoretical) with linear shrinkage 18 – 22% from green compact. Actual values depend on green compaction pressure and dopant package.
+Is the material available with reduced alkali (Na, K) on request?
Yes — Na ≤ 10 ppm and K ≤ 10 ppm specs are available with prior agreement (subject to lot scheduling).