Key Specifications
Headline parameters — full spec sheet on CoA.
| Parameter | Value | Unit |
|---|---|---|
| Purity | ≥ 99.7 | % ZnO |
| D50 | 0.3 – 0.6 | μm |
| Pb | ≤ 30 | ppm |
| BET | 5 – 10 | m²/g (std) |
Full Specification
CAS 1314-13-2 · EINECS 215-222-5 · Indirect process · Verified Chinese manufacturer.
| Parameter | Value |
|---|---|
| Appearance | Loose white powder, no agglomerates |
| ZnO Content | ≥ 99.7% |
| Loss on Ignition (950 °C) | ≤ 0.40% |
| Acid Insoluble Matter | ≤ 0.01% |
| Water Soluble Salts | ≤ 0.10% |
| Lead (Pb) | ≤ 30 ppm |
| Cadmium (Cd) | ≤ 10 ppm |
| Iron (Fe) | ≤ 50 ppm |
| Manganese (Mn) | ≤ 5 ppm |
| Copper (Cu) | ≤ 5 ppm |
| D50 | 0.3 – 0.6 μm |
| Sieve Residue (325 mesh / 45 μm) | ≤ 0.10% |
| BET Surface Area — Standard | 5 – 10 m²/g |
| BET Surface Area — Active Grade | 30 – 60 m²/g |
| Oil Absorption | 12 – 16 g / 100 g |
| Packaging | 25 kg PE-laminated kraft bag · 500 kg / 1 MT FIBC available |
Application Details
+Tire Compounds (Tread, Sidewall, Inner Liner)
Standard dosage 3 – 5 phr in combination with stearic acid (1 – 2 phr) to form the activator complex for sulfur cure. In silica-tread tires, active ZnO at 1.5 – 2 phr is increasingly preferred to reduce vulcanization-byproduct extractables.
+Conveyor Belt & Industrial Rubber
4 – 6 phr in NBR, SBR, and EPDM cover compounds. ZnO also contributes to heat resistance and improved hot tear strength. Surface-coated ZnO (e.g., with stearic acid) speeds dispersion in viscous compounds.
+Footwear (Outsole, Midsole)
Cure activator for SBR and NBR sole stocks at 3 – 5 phr. For light-colored EVA / TPR midsoles, active ZnO is preferred to avoid blooming. For PVC-based outsoles, ZnO functions as an HCl scavenger and stabilizer.
+Adhesive & Sealant Compounds
1 – 3 phr in chloroprene (neoprene) adhesives — both as cure activator and as acid scavenger to extend shelf life. Active ZnO improves storage stability vs standard.
Frequently Asked Questions
+Active ZnO vs standard ZnO — actual dosage savings?
Active ZnO with BET 30 – 60 m²/g typically replaces standard ZnO at a 1 : 2 ratio in tire and EPDM compounds. So a formula using 5 phr standard ZnO can drop to ~2.5 phr active, cutting raw-material cost ~30 – 40% (active is ~50 – 70% pricier per kg). Net savings depend on local prices.
+Does the product comply with REACH and SVHC?
Yes. ZnO is registered under REACH (registration number on request). Not listed on SVHC candidate list. RoHS statement provided on shipment.
+What is the recommended storage condition?
Original sealed bag in dry warehouse, < 30 °C, RH < 70%. Avoid prolonged contact with acidic vapors. Shelf life 24 months in sealed packaging.
+Can you supply with stearic acid surface coating?
Yes — surface-coated rubber-grade ZnO is a separate SKU with 1 – 2% stearic acid pre-mixed. Improves dispersion in dry-mix compounding, especially for high-loading masterbatches. MOQ 1 MT.