Zinc Oxide (Rubber Grade 99.7%, Ceramic & Feed Grade)

French-process ZnO at 99.7% for tyre and rubber compounding, ceramic grades and feed-grade zinc oxide, in bags by container

Zinc oxide is sold on process and grade. Indirect (French) process oxide is made by melting and vaporising zinc metal at about 910 to 1,000 °C and oxidising the vapour in air, then collecting the fume in cyclones and baghouses, which is why it is the low-impurity route and the one used for grades of 99.7% ZnO and above; direct (American) process oxide is reduced from ore or secondary zinc and carries more lead and cadmium. ISO 9298:2017, the rubber industry's test standard, applies to both types and to precipitated and calcined oxides, and sets the methods for loss on heating at 105 °C, water-soluble matter, sieve residue and surface area, with an annex classifying rubber-grade oxides by typical values. A published French-process rubber grade reads 99.7% ZnO minimum on an ignited basis (99.9% typical), lead 0.05% maximum (0.01% typical) and cadmium 0.01% maximum by ASTM D4075, loss at 110 °C 0.3% maximum, surface area 4 to 6 m²/g by ASTM D4315 and 0.03% maximum retained on 325 mesh, and complies with ASTM D79. Surface area is the number a compounder reads after purity: standard oxide sits around 5 to 10 m²/g, while so-called active zinc oxide at 30 to 60 m²/g lets a tyre plant use less zinc per batch for the same activation. Coated grades, treated with fatty acid, oil or wetting agent to disperse faster in the mix, are covered by the same standard. Feed grade is a different specification: under EU Implementing Regulation 2016/1095 zinc oxide is an authorised trace-element feed additive for all animal species, and the EU allows it lead up to 400 mg/kg against the 100 mg/kg applied to other trace-element compounds, with complete-feed zinc capped at 180 mg/kg for salmonids and calf milk replacers, 150 mg/kg for piglets, sows, rabbits and other fish and 120 mg/kg for other species. Zinc oxide is declared under HS 2817.00 together with zinc peroxide.

The buyers are tyre plants and rubber goods makers, where rubber and tyres are the largest single outlet for zinc oxide, ceramic tile and glaze producers, feed-premix and mineral-mix plants, and paint, glass and chemical makers, in the Gulf, South Asia, Southeast Asia, East Africa and Türkiye. CBIL is a commodity brokerage company and brokers French-process and direct-process zinc oxide from producer and trader parcels in China, India, Malaysia, Türkiye and Spain, against the producer's certificate of analysis per lot covering ZnO on an ignited basis, lead, cadmium, loss on heating, surface area and sieve residue, a certificate of origin and a safety data sheet, with independent sampling by SGS, Bureau Veritas or Intertek at stuffing on first shipments. For feed grade the lot also carries the heavy-metal analysis the destination's feed authority requires, and for FDA-related uses the producer's own compliance statement. Zinc oxide is container cargo, 25 kg paper bags on pallets or 1 MT big bags, on FOB, CFR and CIF terms, and minimum lots are confirmed per product and pack. Send the grade, the lead and surface-area limits, monthly tonnage and discharge port, and the enquiry is screened and worked against it.

Excluded origins are not offered, including product re-exported, blended or re-processed through a third country. Every lot moves with a certificate of origin naming the producing plant, mine or grower country, and nothing is quoted before the seller and loading point are known.