Appearance A clear colorless liquid Purity (by GC) Min 99.5% Weight/ mL at 20°C 0.790 - 0.793 g Refractive index (20°C; 589 nm) 1.328 - 1.331 Non volatile matter Max 0.005% Aldehydes and Ketones [(CH3)2CO] Max 0.1% Water (H2O) Max 0.25%