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EINECS 编号 231-545-4
MDL number MFCD00011232
PubChem Substance ID 24881970
Same product — same quality — now Sigma-Aldrich brand
Silica gel is a rigid 3D network of colloidal silica. It is exclusively used as a support material for the active titanium(III) centers in Ziegler-Natta catalysts. Silica gel allows a controlled fragmentation resulting in the formation of uniform polymer particles with narrow particle size distribution and high bulk density. Silica gel is classified as below:
a. Aquagel - pores are filled with water
b. Xerogel - by the process of evaporation, aqueous phase in the pores are removed
c. Aerogel - solvent removed by supercritical extraction
| grade | for thin layer chromatography |
| high-purity grade | |
| form | powder |
| quality | with ~13% calcium sulfate |
| mfr. no. | Sigma-Aldrich |
| particle size | <20 μm |
| >632 mesh | |
| pore size | 0.7-0.85 cm3/g pore volume |
| 60 Å pore size | |
| surface area | 500 m2/g |
| bp | 2230 °C |
| mp | >1600 °C |
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