Melting point :207-209 °C (lit.)
Boiling point :309.07°C (rough estimate)
Density :1.3393 (rough estimate)
refractive index :1.6500 (estimate)
storage temp. :Inert atmosphere,2-8°C
pka :5.43±0.30(Predicted)
form :powder to crystal
color :White to Almost white
BRN :163361
InChI :InChI=1S/C8H7N3O2/c12-7-9-10-8(13)11(7)6-4-2-1-3-5-6/h1-5H,(H,9,12)(H,10,13)
InChIKey :GOSUFRDROXZXLN-UHFFFAOYSA-N
SMILES :N1C(=O)N(C2=CC=CC=C2)C(=O)N1
CAS DataBase Reference :15988-11-1(CAS DataBase Reference)
NIST Chemistry Reference :4-Phenylurazole(15988-11-1)
EPA Substance Registry System :1,2,4-Triazolidine-3,5-dione, 4-phenyl- (15988-11-1)

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 H315 Causes skin irritation Skin corrosion/irritation Category 2 Warning P264, P280, P302+P352, P321,P332+P313, P362 H319 Causes serious eye irritation Serious eye damage/eye irritation Category 2A Warning P264, P280, P305+P351+P338,P337+P313P H332 Harmful if inhaled Acute toxicity,inhalation Category 4 Warning P261, P271, P304+P340, P312 H335 May cause respiratory irritation Specific target organ toxicity, single exposure;Respiratory tract irritation Category 3 Warning
Precautionary statements:	P261 Avoid breathing dust/fume/gas/mist/vapours/spray. P280 Wear protective gloves/protective clothing/eye protection/face protection. P305+P351+P338 IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continuerinsing.