Plan a trial for your application
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.
Purchase specifications and incoming inspection
Review these properties for the intended application grade. Example figures refer to the cited grade or source. Confirm the offered specification, packaging and lead time in the quotation. ASTM D4295 · Zinc oxide classification for rubber ↗
| Property | Unit | Published or agreed specification | Test conditions and checks |
|---|---|---|---|
| Zinc oxide assay | % by mass | Confirm against the offered grade and purchase specification | Specify whether the result is expressed as ZnO or elemental Zn. |
| Specific surface area | m²/g | Confirm against the offered grade and purchase specification | Specify the method, sample pretreatment and activity grade. |
| Lead and other metallic impurities | mg/kg | Confirm against the offered grade and purchase specification | Agree limits for individual elements for the intended application. |
When approving a sample, record the grade, methods, limits and specification revision. On receipt, match the packing lot number to the lot-specific COA and record the measured values and release decision.
From samples to commercial delivery
Packaging and receiving
Mark treatment and net weight on powder or granule bags. Segregate different activity grades.
Storage and handling
After moisture uptake or variable dispersion, compare material from the original pack with the rubber compound.
Sample and order lead times
State the finished part, machine trial quantity and routine order size. Match trial and commercial grades and agree MOQ, load unit, lead-time start and arrival.
Questions from the plant
Does higher assay necessarily give higher cure activity?
Compare surface area, dispersion and cure curves in one formulation.
Can active zinc oxide replace conventional zinc oxide weight for weight?
Start with effective zinc and establish a usable range through rubber-compound trials.
Report a delivery or batch issue
Include the order number, lot number from the package, label photos and inspection records for the affected lot. When retesting, check Zinc oxide assay, Specific surface area, Lead and other metallic impurities.
Request documents for your application
TDS · Technical data sheet
For grade selection and sample approval, specify the grade and revision required.
SDS · Safety data sheet
Specify the country or region of use and the required language.
COA · Certificate of analysis
Request a sample COA during supplier review. For incoming inspection, provide the actual lot number.