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By certification 
Item indicator
Ⅰ Ⅱ Ⅲ Ⅳ Ⅴ Ⅵ
Apperance achromatous or light yellow ，no visual impurities
Hydroxyl value(mmol/g) 0.47~0.53 0.54~0.64 0.65~0.70 0.71~0.80 0.81~1.00 1.00~1.40
viscosity（40℃），Pa.s max 9.5 8.5 4.0 3.5 5.0 3.0
Peroxide value,% max 0.04 0.04 0.05 0.05 0.10 0.10
Water content,% max 0.05 0.05 0.05 0.05 0.10 0.10
volatile content,% max 0.5 0.5 0.65 0.65 1.0 1.0
Ⅰ Ⅱ Ⅲ Ⅳ Ⅴ Ⅵ
Apperance achromatous or light yellow ，no visual impurities
Hydroxyl value(mmol/g) 0.47~0.53 0.54~0.64 0.65~0.70 0.71~0.80 0.81~1.00 1.00~1.40
viscosity（40℃），Pa.s max 9.5 8.5 4.0 3.5 5.0 3.0
Peroxide value,% max 0.04 0.04 0.05 0.05 0.10 0.10
Water content,% max 0.05 0.05 0.05 0.05 0.10 0.10
volatile content,% max 0.5 0.5 0.65 0.65 1.0 1.0