This standard specifies the test methods for silica gel. This standard applies to HG/T 2765.1 "Silica Gel with Fine Pore Silica Gel" HG/T 2765.2 "Silica Gel with Coarse Pore Silica Gel", HG/T 2765.3 "Silica Gel Microsphere Silica Gel", HG/T 2765.4 "Silica Gel Blue Gel Fat Indicator and Color Changing Silica Gel" Specified required test methods.