Melting point :90-92 °C(lit.)
Boiling point :295 °C(lit.)
Density :1.2599 (rough estimate)
refractive index :1.5380 (estimate)
storage temp. :under inert gas (nitrogen or Argon) at 2-8°C
form :Flakes or Crystalline Powder
color :White to yellow-orange
Water Solubility :insoluble
Henry's Law Constant :1.4×10⁰ mol/(m³Pa) at 25℃, Zhang et al. (2010)
InChI :InChI=1S/C9H6O3/c1-5-2-3-6-7(4-5)9(11)12-8(6)10/h2-4H,1H3
InChIKey :ZOXBWJMCXHTKNU-UHFFFAOYSA-N
SMILES :C1(=O)C2=C(C=C(C)C=C2)C(=O)O1
CAS DataBase Reference :19438-61-0(CAS DataBase Reference)
NIST Chemistry Reference :4-Methylphthalic anhydride(19438-61-0)
EPA Substance Registry System :1,3-Isobenzofurandione, 5-methyl- (19438-61-0)

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. P305+P351+P338 IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continuerinsing.