Sell P-hydroxybenzoic Acid

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