... oxalic acid,used as drilling fluid and completion fluid in oil field,used as road antifreeze and cement antifreeze. CERTIFICATE OF ... Appearance White Crystalline Powder White Crystalline Powder Sodium formate, wt.%, 95.0 min. 95.2 Organic impurity, wt.%, 5 max. 4.8 Chloride ... Moisture, wt.%, 3 max. 2.6 White powder Sodium Formate 95%