Quality standard:
ITEMS SPECIFICATIONS
Liquid crystal grade Industrial grade
Appearance: white crystal powder white crystal powder
Color: < 30 APHA 40APHA
Melting point(C): 214-217 213-217
Solubility: clear, transparent, Colorless clear, transparent, Colorless
Methanol insoluble matter
Ug/g 50
Assay (titration method)% 99.5 99.0
Assay (GC) % 99.5 99.0
Salicylic acid (GC) % 0.02 0.10
Benzene powder(GC) % 0.01 0.10
Loss on drying % 0.20 0.50
Ash % 0.02 0.15
Sulfate
Ug/g 50 500
Chloride
Ug/g 50 200
potassium ion
Ug/g 10
Sodium ion
Ug/g 10
Ferric ion
Ug/g 10

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