Vapor density : ~3 (vs air)
Vapor pressure :
  256 mm Hg (37.7 °C)
  5.2 psi (37.7 °C)
  ~132 mmHg (20 °C)
Autoignition temp.: 453 °F
expl. lim.: 7.7 %

Total impurities :  ≤ 0.0001 % thiophene
  ≤ 0.001 % non-volatile matter
  ≤ 0.002 % free acid (as CH₃COOH)
  ≤ 0.005 % S-compounds (as S)
  ≤ 0.01 % aromatic substances (as C₆H₆)
  ≤ 0.01 % water (Karl Fischer)
Refractive index :
  n_20/D : 1.3745-1.3755
  n_20/D : 1.375(lit.)
bp = 69 °C(lit.)
mp = −95 °C(lit.)
Density : 0.659 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.