Silica gel, pptd., cryst.-free
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Silica gel, pptd., cryst.-free
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CAS No:
112926-00-8
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Chemical Name:
Silica gel, pptd., cryst.-free
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Synonyms:
Silica gel,pptd.,cryst.-free;Synthetic cryst.-free silica gel;Cryst.-free silica gel;Amorphous synthetic silica gel;Pptd. synthetic amorphous silica;Silica sol,pptd.,crystalline-free;Synthetic amorphous silica,pptd.;Pptd. crystalline-free silica sol;112945-53-6
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CAS No:
Description
white to off-white powder Amorphous silica, the noncrystalline form of SiO2, is a transparent to gray, odorless, amorphous powderA gel made by coagulating sodium silicate sol. The gel is dried by heatheating and used as a catalyst support and as a drying agent. The silica gel used in desiccators and in packaging to remove moisture is often colored with a cobalt salt to indicate whether it is still active (blue=dry; pink=moist). A rigid gel made by coagulatinga sol of sodium silicate andh
Characteristics
34.1
0.00000
blue
2.20
1610°C
2230℃
23°C
Insoluble
2-8°C
0 mmHg (approx)
Noncombustible Solid
Silica gel at -78 deg C adsorbs 4.5 wt % of ozone, and below this temperature the concentration increases rapidly. At below -112 deg C ozone liquefies and there is a potential explosion hazard at temperatures below -100 deg C if organic material is present.
Odorless
Tasteless
Safety Information
1993
2
20-37-42/43-49-36/37-48/20-51/53-68-50/53-41-22-60
22-24/25-45-36/37-53-26-36-61-60-39
VV7315000
Xi,T,N,Xn
Separated from strong oxidants.
Harmful/Irritant
P201-P273-P308 + P313
H350i-H360F-H412
Silica gel, pptd., cryst.-free Use and Manufacturing
In the immersion method, the fine-hole spherical silica gel or fine-hole block silica gel to remove the impurities is used to absorb moisture of the silica gel by direct steam in the moisture absorption chamber. The indoor temperature is adjusted by a cold air pump, and the temperature of the upper silica gel is controlled not to exceed 70°C. After 30h, check whether the moisture absorption is complete (subject to not being fried in water). After the moisture absorption is complete, the material is stuffed for 8h, and then placed in a dipper equipped with cobalt chloride and ammonium chloride. The dyeing solution is 1L and dry glue 1.1 The ratio of kg is carried out. The wet glue should be poured once and stirred rapidly, keeping the room temperature above 15℃, impregnated for 6-12 hours, then dehydrated, dried at 90～110℃ until the moisture content is ≤2%, and the blue glue is prepared by screening Indicator and color-changing silica gel.
Silica gel was used on glass plates for preparative TLC and on aluminium sheets for analytical TLC. Silica gel was used in vacuum chromatography and TLC. Silica gel was used in column chromatography.
Drug Function and Efficacy
Clotrimazole vaginal tablets are drugs used to treat vaginal fungal infections. Its active ingredient is clotrimazole, which can inhibit the growth and proliferation of fungal cells, such as yeast, many other fungi and some bacteria that are sensitive to clotrimazole.
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