Melting point :165-166 °C
Boiling point :217.23°C (rough estimate)
Density :1.0551 (rough estimate)
refractive index :1.4496 (estimate)
solubility :soluble in Methanol
form :Solid
pka :14.40±0.46(Predicted)
color :White
NIST Chemistry Reference :Urea, (1-methylpropyl)-(689-11-2)
EPA Substance Registry System :sec-Butylurea (689-11-2)

Symbol(GHS):
Signal word:	Warning
Hazard statements:	Code Hazard statements Hazard class Category Signal word Pictogram P-Codes H302 Harmful if swallowed Acute toxicity,oral Category 4 Warning P264, P270, P301+P312, P330, P501 H317 May cause an allergic skin reaction Sensitisation, Skin Category 1 Warning P261, P272, P280, P302+P352,P333+P313, P321, P363, P501
Precautionary statements:	P261 Avoid breathing dust/fume/gas/mist/vapours/spray. P264 Wash hands thoroughly after handling. P264 Wash skin thouroughly after handling. P270 Do not eat, drink or smoke when using this product. P272 Contaminated work clothing should not be allowed out of the workplace. P280 Wear protective gloves/protective clothing/eye protection/face protection. P301+P312 IF SWALLOWED: call a POISON CENTER or doctor/physician IF you feel unwell. P302+P352 IF ON SKIN: wash with plenty of soap and water. P321 Specific treatment (see … on this label). P330 Rinse mouth. P333+P313 IF SKIN irritation or rash occurs: Get medical advice/attention. P363 Wash contaminated clothing before reuse. P501 Dispose of contents/container to..…