2. Technical index Appearance Light yellow transparent oily liquid Flash point(open) ℃ ≥185 Ester content ≥99% Density g/cm3 (25℃) 1.02－1.07 Acidity (mgKOH/g) ≤0.1% Freezing point℃ ＜－10 Hot volatilize quantit(100℃,6h) ＜0.5% Refractive index（20℃） 1.494－1.500