Melting point :0°C
Boiling point :126-127 °C (lit.)
Density :1.294 g/mL at 25 °C (lit.)
refractive index :n20/D 1.410(lit.)
Flash point :106 °F
storage temp. :Flammables area
form :Liquid
color :Clear colorless to pale yellow
Water Solubility :soluble
BRN :1700256
Dielectric constant :22.5（23℃）
CAS DataBase Reference :616-42-2(CAS DataBase Reference)
NIST Chemistry Reference :Sulfurous acid, dimethyl ester(616-42-2)
EPA Substance Registry System :Sulfurous acid, dimethyl ester (616-42-2)

Symbol(GHS):
Signal word:	Warning
Hazard statements:	Code Hazard statements Hazard class Category Signal word Pictogram P-Codes H226 Flammable liquid and vapour Flammable liquids Category 3 Warning 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:	P210 Keep away from heat/sparks/open flames/hot surfaces. — No smoking. P302+P352 IF ON SKIN: wash with plenty of soap and water. P305+P351+P338 IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continuerinsing.