TEST ITEM

SPECIFICATION

RESULT

APPEARANCE

Yellowish Crystalline Powder    

Conforms  

IDENTIFICATION

Conform to prescribed

Conforms

MELTING POINT

60-62℃

60.4℃

HEAVY METALS

≤10ppm

＜10 ppm

LOSS ON DRYING

≤0.2%

0.16%

RESIDUE ON IGNITION

≤0.1%

0.06%

RELATED SUBSTANCES

6.8-EPITRITHIOCTIC ACID

≤0.50%

0.32%

SINGLE UNKNOWN

IMPURITY

≤0.20%

0.09%

TOTAL IMPURITIES

≤0.80%

0.73%

RESIDUAL SOLVENTS

TOLUENE

≤30 ppm

＜30 ppm

CYCLOHEXANE

≤2000 ppm

＜2000 ppm

ETHYL ACETATE

≤250 ppm

＜250 ppm

ASSAY (HPLC)

99%-101%

99.18%