PH indicator range: 4.5£¨red£©~6.2£¨yellow£©

Residue on ignition (as sulfate): 0.2%max

Mass-absorption coefficient ¦Ë1£¨PH4.5£©,L/(cm¡¤g): 130min

                                        ¦Ë2£¨PH6.2£©,L/(cm¡¤g): 70min

Maximum absorption wavelength ¦Ë1£¨PH4.5£©,nm: 523~528

   ¦Ë2£¨PH6.2£©,nm: 427~437

Loss on drying: 1.0%max