Index

Fine product

Superior grade

First grade

Second grade

Qualified product

Appearance

White crystal or powder

Purity／%≥

Gas phase chromatography

—

99.0

—

99.0

99.0

Liquid phase chromatography

98.5

—

99.0

—

—

Melting point／℃≥

256.0

255.5~258.0

256.0~258.0

255.5~258.0

255.5~258.0

Drying loss／%≤

—

0.50

0.50

0.50

0.50

Solubility in xylene／%

100

—

—

100

100

Chroma≤

in Xylene

50

—

—

150

—

in Methanol

—

150

—

—

—

In ethanol

—

—

10

—

—

Free acid/%≤

—

0.50

0.50

0.50

0.50

Free chlorine/%≤

—

0.001
(10ppm)

0.001
(10ppm)

0.001
(10ppm)

0.001
(10ppm)

Iron content/ppm≤

30

10

—

10

10

Alkali insoluble/%≤

—

0.50

—

—

—

Hexachlorobenzene/%≤

0.015
(150ppm)

0.100
(1000ppm)

0.100
(1000ppm)

0.100
(1000ppm)

—

Sulfate /%≤

0.010
(100ppm)

—

—

—

—

Tetrachloride phthalic acid
/%≤

0.7

—

—

—

—

Water/%≤

0.04

—

—

—

—