... in pharmacy, 2.in rare earths processing, and fiber bleacher, removing rust Oxalic Acid 1. Property: White or greyish powder, odorless,tasteless ... ≥99.6%Sulfate radical (caculate as SO42-)≤0.08%Heavy metal (as Pb)≤0.001%Iron (as Fe3+)≤0.0015%Chloride ... in pharmacy, precipitator in rare earths processing, and fiber bleacher, removing rust, abrasive etc.4. Packing: 25kgs/50kgs/bag, or 1000kgs bulk ...