Melting point :245 °C
Boiling point :353.17°C (rough estimate)
Density :1.2911 (rough estimate)
refractive index :1.4500 (estimate)
storage temp. :Sealed in dry,Room Temperature
pka :7.44±0.20(Predicted)
form :powder to crystal
color :Light orange to Yellow to Green
Water Solubility :Insoluble in water.
BRN :178595
CAS DataBase Reference :7797-81-1(CAS DataBase Reference)
EPA Substance Registry System :1H-Benz[de]isoquinoline-1,3(2H)-dione, 2-hydroxy- (7797-81-1)

Symbol(GHS):
Signal word:	Warning
Hazard statements:	Code Hazard statements Hazard class Category Signal word Pictogram P-Codes 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 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. P264 Wash hands thoroughly after handling. P264 Wash skin thouroughly after handling. P280 Wear protective gloves/protective clothing/eye protection/face protection. P304+P340 IF INHALED: Remove victim to fresh air and Keep at rest in a position comfortable for breathing. P305+P351+P338 IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continuerinsing. P405 Store locked up.