Vapor density : 3.5 (vs air)
Vapor pressure :
  40 mmHg (20 °C)
  83 mmHg (37,7 °C)
Autoignition temp. : 433 °F
expl. lim.: 7 %
Total impurities :
  ≤ 0.0005 % free acid (as CH₃COOH)
  ≤ 0.001 % non-volatile matter
  ≤ 0.005 % S-compounds (as S)
  ≤ 0.01 % water (Karl Fischer)
Refractive index :
  n20/D = 1.387(lit.)
  n20/D = 1.3870-1.3880
bp = 98 °C (lit.)
mp = −91 °C (lit.)
Density : 0.684 g/mL at 25 °C (lit.)
Cation traces :
  Al: ≤ 0.5 mg/kg
  B: ≤ 0.02 mg/kg
  Ba: ≤ 0.1 mg/kg
  Ca: ≤ 0.5 mg/kg
  Cd: ≤ 0.05 mg/kg
  Co: ≤ 0.02 mg/kg
  Cr: ≤ 0.02 mg/kg
  Cu: ≤ 0.02 mg/kg
  Fe: ≤ 0.1 mg/kg
  Mg: ≤ 0.1 mg/kg
  Mn: ≤ 0.02 mg/kg
  Ni: ≤ 0.02 mg/kg
  Pb: ≤ 0.1 mg/kg
  Sn: ≤ 0.1 mg/kg
  Zn: ≤ 0.1 mg/kg
suitability passes test for reaction against H₂SO₄

RIDADR : UN 1206 / Classe danger : 3 / Groupe d'emballage : 2.