acidity: 1.2ml 
chloride:<200ppm
sulfate:<600ppm
heavy metal:<0.02%
assay:99.83%


related compounds:
4-hydroxybenzoic acid:0.06%
4-hydroxyisophthalic acid:0.02%
phenol:not detected
other impurities:not detected
total impurities:0.11%
in compliance with the USP.32 Edition, BP 2013 Edition