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Description:Specifications: Content (dry basis): ≥98.5% (a20)D specific rotation:+18.0-+21.5 Dry weightlessness: ≤1.0% Burn draff: ≤0.3% Ammonium salt: ≤0.04% Heavy metal (as Pb): ≤0.003% Arsenic: ≤0.0002% PH(10g/dl): 5.0-8.0