Does greater purity guarantee greater cure activity?
Zinc oxide purity, surface area and dispersion describe different factors. A higher assay alone does not establish a faster cure.
Compare active zinc oxide in the same cure system
Use the same base rubber and other cure ingredients. Record scorch, cure curves and finished-part performance, then compare dosage among grades that meet the target.
Can active zinc oxide replace conventional zinc oxide weight for weight?
Start with effective zinc and establish a usable range through rubber-compound trials. Vulcanization activation: Hold fatty acid and accelerator system fixed. Compare cure rate, scorch and mechanical properties. Light-colored rubber compounds: Compare dispersion, color and appearance after aging.
Checking Zinc oxide assay and Specific surface area
Zinc oxide assay (% by mass): Specify whether the result is expressed as ZnO or elemental Zn. Specific surface area (m²/g): Specify the method, sample pretreatment and activity grade. Lead and other metallic impurities (mg/kg): Agree limits for individual elements for the intended application.
What to record
- Zinc oxide assay
- Specific surface area
- Actual dosage
- Scorch
- Cure result
Technical references
Products and processes
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