Zochem Zochem Our Zinc Oxide product is a brilliant white powder manufactured by the French (Indirect) Process.
Grade 500WSA is a popular general use high quality zinc oxide.
Grade 500WSA replaces grade ZOCO 600.
USES
This grade is used where lower impurities and high assay are required, and where a wider m2/g surface area is suitable. Applications include fertilizer, feed, ceramics, and all other applications except where a special zinc oxide characteristic is required or requested.
Grade 500WSA meets GMP 21CFR110, is USFDA approved as GRAS (Generally Recognized As Safe) at 21cfr182.8991 and is authorized by the USFDA for use wherever GRAS is approved including food contact in rubber, plastics, and coatings.
Grade 500WSA also meets the requirements of ASTM specification D79, 2002/95/EC Restriction of Hazardous Substances Directive (RoHS) for heavy metals and Waste Electrical and Electronic Directive (WEEE), and other regulations where high quality zinc oxide is required.
Chemical Analysis (%) | Typical Limit** | Nominal | Test Method |
|---|---|---|---|
| Zinc Oxide (ZnO) ignited basis | 99.7 min | 99.9 | Supplier (calculation) |
| Lead (Pb)* | 0.05 max | 0.01 | ASTM D4075 |
| Cadmium (Cd)* | 0.01 max | 0.001 | ASTM D4075 |
| Iron (Fe) | 0.003 max | 0.001 | ASTM D4075 |
| Copper (Cu) | 0.001 max | 0.0001 | ASTM D4075 |
| Loss at 110° (moisture) | 0.3 max | 0.2 | ASTM D280 |
Chemical Analysis (%) | Typical Limit** | Nominal | Test Method |
|---|---|---|---|
| Surface Area (m2/g)* | 2.5 – 11.0 | 5 | ASTM D4315 |
| Fineness retained on 325 mesh (%)* | 0.03 max | 0.01 | ASTM D815 |
| (Fineness passing through 325 mesh (%) | 99.97 min | 99.99 | ASTM D815 |
| Specifications | ASTM D79 |
* Regular test item for process & product control and included on COA. Other items are for reference only.
** Zochem can produce zinc oxide to customer specifications superseding the above table.
Standard Packaging: 50 lb. Kraft paper bags on 2,000 to 2,500 lb net wt. pallet unit, or 2,000 lb FIBC.
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