Molecular formula C5h5n5 Molecular weight 135.13 Cas no. 73-24-5 Identification Infrared absorption Loss on drying 1.0% Residue on ignition 0.1% Heavy metals 0.001% Organic volatile impurities Complies to usp29 Oranic impurities Complies to usp29 Nitrogen content 50.2-53.4% Assay 98.0-102.0% Storage Keep dry, stable at room temperature. 25kg/barrel