Melting point :132-135 °C(lit.)
Boiling point :332.48°C (estimate)
Density :1.335 g/mL at 25 °C(lit.)
bulk density :720-760kg/m3
vapor pressure :<0.1 hPa (20 °C)
refractive index :n20/D 1.40
storage temp. :2-8°C
solubility :H₂O: 8 M at 20 °C
form :powder
pka :0.10(at 25℃)
color :white
Specific Gravity :1.335
Odor :almost odorless
PH :8.0-10.0 (20℃, 8M in H2O)
biological source :synthetic
Water Solubility :1080 g/L (20 ºC)
λmax :λ: 260 nm Amax: 0.03
λ: 280 nm Amax: 0.02 Merck :14,9867
BRN :635724
Henry's Law Constant :5.7×10⁶ mol/(m³Pa) at 25℃, Duchowicz et al. (2020)
Dielectric constant :3.5（Ambient）
Stability :Substances to be avoided include strong oxidizing agents. Protect from moisture.
Cosmetics Ingredients Functions :BUFFERING
HUMECTANT
SKIN CONDITIONING
ANTISTATIC InChI :1S/CH4N2O/c2-1(3)4/h(H4,2,3,4)
InChIKey :XSQUKJJJFZCRTK-UHFFFAOYSA-N
SMILES :NC(N)=O
LogP :-1.660 (est)
CAS DataBase Reference :57-13-6(CAS DataBase Reference)
NIST Chemistry Reference :Urea(57-13-6)
EPA Substance Registry System :Urea (57-13-6)
Absorption :≤0.06 at 260nm at 5M
≤0.06 at 280nm at 5M

Symbol(GHS):
Signal word:	Warning
Hazard statements:	Code Hazard statements Hazard class Category Signal word Pictogram P-Codes H320 Causes eye irritation Serious eye damage/eye irritation Category 2B Warning P264, P305+P351+P338,P337+P313
Precautionary statements:	P264 Wash hands thoroughly after handling. P264 Wash skin thouroughly after handling. P305+P351+P338 IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continuerinsing. P337+P313 IF eye irritation persists: Get medical advice/attention.