OmniPur® Urea - CAS 57-13-6 - Calbiochem Ideal for protein unfolding/denaturation. Molecular biology grade. Specifications: DNase: None detected Concentration (molarity): 0.9-1.1 M pH of solution at 25°C: 10.1 Protease: None detected RNase: None detected Sterility: To pass test Intended for laboratory and manufacturing use only. Not for drug, food, or household use. 产品信息 Form Clear, colorless liquid CAS number 57-13-6