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 %

Impurities :
 ≤0.0005% free alkali (as NH₃)  
 ≤0.0005% non volatile matter  
 ≤0.001% free acid (as CH₃COOH)  
 ≤0.01% water (Karl Fischer)  
Transmittance :
 220 nm, ≥20%  
 225 nm, ≥80%  
 250 nm, ≥98%  
Refractive index : 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 :
 Ca: ≤0.1 mg/kg  
 K: ≤0.1 mg/kg  
 Mg: ≤0.1 mg/kg  
 Na: ≤0.1 mg/kg  
Suitability : passes test for suitability for LC-MS