Appearance:Colorless or light yellow liquid;
Colour(Fe-Co method):≤5;
viscosity 25℃,mpa.s:≤45;
Density 20℃,g/cm31.21±0.05;
Content of acid anhydride %:≥40.5;
Acid value mgKOH/g;660-685;
Freezing point ℃:≤-15;
Volatile content %:≤1.0;
Free Acid %:≤1.0