Removal of impurities and the @E02038@ of pores from a @X06700@ to give a material of as near bulk density as possible.
Source: PAC, 2007, 79, 1801. (Definitions of terms relating to the structure and processing of sols, gels, networks, and inorganic-organic hybrid materials (IUPAC Recommendations 2007)) on page 1822 [Terms] [Paper]