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Quality standard:
ITEMS SPECIFICATONS
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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