Chemical Specifications Appearance A clear Colourless liquid Purity (by GC) Min 99.5% Weight/ mL at 20°C 0.899 - 0.902 g Refractive index (20°C; 589 nm) 1.370 - 1.373 Appearance of solution Passes test Acidic substances Conforms Acidity Confirms Methyl compounds (GC) Confirms Related substances (GC) Confirms Readily carbonisable substance Confirms Water (by KF) Max 0.1% Non volatile matter Max 0.003%