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What Is Silica Gel?

Jul 29, 2017

What is silica gel?

Silica gel alias: silicic acid gel, is a highly active adsorption material, belongs to the amorphous material. Silica gel is the main component of silica, chemical stability, not burning

Essential information

Name: silica gel

Alias: oxidized silica gel or silicic acid gel

English Name: Silica gel; Silica

Molecular formula: xSiO2. YH2O

Molecular weight: 60.08

CAS login number: CAS# 112926-00-8

EINECS login number: 231-545-4

Word explanation

Chemical formula xSiO2 & yH2O. Clear or milky granular solid. It has an open porous structure, strong adsorption, and can adsorb a variety of substances. When dilute sulfuric acid (or hydrochloric acid) is added to the aqueous solution of the water glass and placed statically, it becomes hydrated silicic acid gel and is solid. The electrolyte Na+ and SO4 2- (Cl-) ions dissolved in water can be removed by washing, and silica gel can be obtained after drying. Such as absorption of moisture, some silica gel moisture absorption of about 40%, or even 300%. For gas drying, gas absorption, liquid dehydration, chromatography, etc., are also used as catalysts. Such as adding cobalt chloride, blue when drying, red after water absorption. Renewable reuse.

Safety performance

Silica gel is the main component of silica, chemical stability, not burning. Silica gel is an amorphous silica, should control the workshop dust content is not more than 10 mg / cubic meter, need to strengthen the exhaust air, operation wear mask.

Silicone has a strong adsorption capacity, can produce a drying effect on the human skin, therefore, should wear good work clothes. If silicone enters the eye, flush with plenty of water and seek medical attention as soon as possible.

Blue silica gel, which contains a small amount of cobalt chloride, is potentially toxic and should be avoided from food contact and inhalation. In case of poisoning, seek medical attention immediately.

In the use of silica gel, because of adsorption of water vapor or other organic substances in the medium, the adsorption capacity decreased, and can be reused after regeneration.

Safety term: S22 Do, not, breathe, dust., do not inhale dust.

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