Molecular formula

C4H8O3（CH3OCOOC2H5）

Molecular weight

104.10 g/mol（ 104.0473）

 Appearance

Colorless clear liquid, sweet ether-like odor

 Melting point

consistent across mfr & GESTIS; some DBs list -14.5 C, likely pour-point variant）

 Boiling point

~107 C at 760 mmHg; Merck/Sigma & Carl Roth list 101 C, grade variant）

 Density

1.01 g/cm³（20 °C；Dräger 1.013）；1.006 g/mL（25 °C，ChemicalBook/Sigma）

 Vapor density (air=1)

heavier than air

 Vapor pressure

43 hPa（≈ 32 mmHg）@ 25 °C（ChemicalBook、Dräger、ChemBlink、SoleChem 

 Flash point

Closed cup ~20.5 C; measured range ~20.5-27 C. At the Flam. Liq. 2/3 boundary

Auto-ignition temp.

Dräger/GESTIS ignition temp）

 Explosive limits (air)

No reliable public data; manage as flammable liquid, keep from ignition

 Refractive index (n20/D)

1.378（ 1.377 – 1.379）

 log P 

~ 0.972（@40 °C，ChemicalBook/ChemBlink/SoleChem）；XLogP3 0.9（PubChem ）

 Viscosity (25 °C)

~ 0.65 – 0.69 mPa·s（huaxuejia 0.65；ChemicalBook 0.69 mm²/s）

 Solubility

Slightly soluble in water (~46.8-47.1 g/L @20 C); miscible with ethanol, ether; hydrolyzes slowly in water

 Dielectric constant

 ~2.82（@ 25 °C indicative）

pH 

N/A, non-aqueous neutral organic）

 WGK

1 (Germany); Merck/Sigma mfr & Carl Roth agree; some Chinese SDS erroneously list WGK 3 - this TDS uses authoritative mfr value WGK 1）