| Customization: | Available |
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| CAS No.: | 112926-00-8 |
| Formula: | Sio2 |
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Silica gel is a form of silicon dioxide that is porous as well as amorphous. It consists of a framework of tridimensional and also irregular geometry of alternating silicon (Si) and oxygen (O) atoms with a scale of nanometer voids and pores. The voids of the silica gel structure may contain either liquid or gas, vaccum. Manufacturers often put little packets of the gel as it is a desiccant or drying agent that helps to keep moisture from damaging certain food products and also commercial products. Silica gel is usually prepared by the process of acidification of a solution of a silicate (water glass).
Indicative silica gel:
Orange to dark green & blue to pink
Technical Data Sheet
| Items | Technical Data | |
| Adsorption capacity % | RH=20% ≥ | 11.0 |
| RH=50% ≥ | 26.0 | |
| RH=90% ≥ | 36.0 | |
| Loss on heating % ≤ | as agreed | |
| PH | 4-8 | |
| Specific resistance Ω.cm ≥ | 4000 | |
| SiO2 % ≥ | 99 | |
| Qualified ratio of spherical granules % ≥ | 90 | |
| Ratio of particle size % ≥ | 90 | |
| Bulk density g/L ≥ | 750 | |
| Note: qualified ratio of spherical granules is only applicable fo fine pores silica gel. | ||
COA example of 0.2mm-1mm silica gel granules:
Desiccant
A desiccant is a hygroscopic material used for maintaining dryness. For manufacturers, the purpose of silica gel is to be used as a desiccant. Silica gel also serves to keep the relative humidity inside a system of satellite transmission waveguide as low as possible. In compressed air systems of any industry, silica gel is also used to dry the air. Where a bed of silica gel beads is made for the air from the compressor discharge to flow through it. The silica gel beads are used for adsorbing the amount of moisture present in the air and preventing it from damaging at the point of use of the compressed air due to condensation. A similar kind of system is used for drying the compressed air on railway locomotives.
Water filtration
Silica gel has water absorption properties because of this property it is used in domestic water filters. Some minerals that are dissolved in water can be absorbed by the surface structure of silica gel. Because of the lack of regulations for products of the filtrations of domestic water, no studies give validation to the manufacturer claims regarding the effectiveness of the filtration system of sorbent silica gel.
Humidity indicator
The silica gel changes its colour slowly whenever it is doped with an indicator of moisture as it transitions from the anhydrous state which is a dry state to the hydrated state that is a wet state.
Chemistry
Silica gel in chemistry is applied in chromatography as a stationary phase. This gel is also applied to glass, plastic sheets and aluminium for thin-layer chromatography. Silica gel is also bound to chelating covalently. These materials possess the ability to remove the metal ions selectively from aqueous solutions. Chelating groups are able to make bonds (covalent bonds) to polyamines. This can also be combined with alkali metals and it forms an M-SG reducing agent. Silicon dioxide is not expected to biodegrade in soil and water.
Other absorbents
Bentonite clay, activated clay, molecular sieve, oxygen absorber, ethylene absorber, CO2 absorber,etc.
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