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Urea, molecular biology grade

- Synonyms: Carbamide, Carbonyldiamider- CH4N2Or- M = 60,06 g/molr- CAS [57-13-6]r- EINECS-No.: 200-315-5r- Solub. in water: (20 ºC): 590 g/lr- Melting point: 132,5 - 134,5 ºCr- Vapour pressure: (75 ºC) ~ 0,002 hPar- LD 50 (oral, rat): 8471 mg/kgr- Tariff number: 3102 10 10 00r- Applications: laboratory reagent, in biochemistry, in fertilizer compositions, manufacturing of synthetic resins, in the plastics industry, for reversible denaturation of proteins.rrSPECIFICATIONSrassay (DSC): min. 99,5 %ridentity (IR-spectrum): passes testrappearance: passes testrappearance of solution: passes testrabsorbance of an aqueous solution 8 M in a 1 cm cell at 260 nm: max. 0,1 AUrabsorbance of an aqueous solution 8 M in a 1 cm cell at 280 nm: max. 0,1 AUrchlorides (Cl): max. 0,0005 %rcyanides (CN): max. 0,000001 %rsulfates (SO4): max. 0,001 %rammonium (NH4): max. 0,00001 %rheavy metals (as Pb): max. 4 ppmriron (Fe): max. 0,2 ppmrbiuret: max. 0,05 %rresidue on ignition (800 ºC): max. 0,01 %rDNases, RNases, Proteases : non detectedr