... (as DMSO), %: ≥ 99.9 Crystallization point, : ≥ 18.3 Refractive index: 1.478~~1.479 Moisture, %: ≤ 0.01 UV extinction value: 275nm ≤ 0.3 ... .2295nm ≤ 0.2Heavy metals, ppm: ≤ 10 Specific gravity(20): 1.100-1.104 Acid value(0.1N/ml NaOH/50g): ≤ 5.0 ... , : ≥ 18.35 Acid value(mgKOH/g): ≤ 0.001Refractive index(20): 1.4781.479 Moisture, %: ≤ 0.001 Evaporation residue, PPM: ≤ 5. Heavy ...