Micron Spherical Silica Gel Powder for Cosmetics Additive and Column Chromatography
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Silica gel terminology

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a) Specific surface: refers to the surface area per gram of silica gel, including the sum of internal microporous surface area and external surface area


Unit: m2/g


b) Pore volume: the total volume of pores in each gram of silica gel.


Unit: mg/g (mL/g)


c) Pore diameter: refers to the diameter of micro pores inside the silica gel.


Unit: angstrom (A 0) or nanometer (nm) 1nm=10A 0


d) Adsorption capacity: the amount of water vapor adsorbed by silica gel at a certain relative humidity reaches saturation, and the amount of water vapor adsorbed at this time is called adsorption capacity.


Unit:%


e) Stacking density: the ratio of the mass of silica gel to the volume of its stacking space.


Unit: g/L


f) PH value: it is defined as the negative logarithm of hydrogen ion concentration. The PH value of silica gel refers to the PH value of silica gel aqueous solution containing a certain proportion after treatment under certain conditions.


g) Specific resistance: it is an indicator of silica gel purity. The specific resistance itself is defined as the resistance of the solution at a distance of 25px. The specific resistance of silica gel refers to the dissolution of water-soluble electrolyte in silica gel after treatment under certain conditions, and the specific resistance of solution is measured by conductivity. The higher the specific resistance is, the lower the electrolytic quality of water-soluble silica gel is.


Unit: ohm. cm (Ω NaN)


h) Abrasion rate: it is an indicator of the abrasion resistance of silica gel. It refers to the loss of silica gel abrasion under certain conditions.


Unit:%


i) Non burst rate in water: refers to an index of water resistance of water resistant silica gel.


Unit:%