... , unit, test methods):Can exchange capacity (as anhydrous base): 310 minimum, mgCaCO3/g, QB/1768-2003 complexometric titration Ca Sequestering rate ... minimum PH (at 1% ambient T): 11 max, QB/1768-2003 Whiteness grade (W=Y): 96.5 min % GB/T13176.1 97 ... Crystalline (with standard sample comparison test): 97 minimum % x-ray diffraction Liquid carrying capacity: 31 minimum g/100g Q/B2006-1 Bulk density ...