Item	Index	Grade
		Superior grade		First grade	accepts
Ester content%	≥	99.5		99.0
Density (ρ20)g/cm3		0.982~0.988
Acidity (phthalic acid)%	≤	0.010	0.015		0.030
Chroma	≤	30	40		120
Flash pointing℃	≥	195	192		190
Heating loss%	≤	0.2	0.3		0.5
Chroma after heating	≤	75	-		-
Volume resistivity Ω.m	≥	1*1011	-		-