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Type A Silica Gel

Type A Silica Gel

Type A Silica Gel

中文名:A型硅胶

Molecular formula: xSiO2·yH2O

Molecular weight: 60.08

Sizes: 0.5-1.5mm, 0.5-1mm, 1-3mm, 2-4mm, 3-5 mm, 4-8mm

Type A silica gel also called Fine-pored silica gel

Specifications

Item

Unit

Type 1

Type 2

Appearance

 

Transparent, translucent, glass-like pellet or lump

Adsorption capacity

RH=20%

%

≥11

≥11

RH=50%

%

≥25

≥25

RH=90%

%

≥37

≥37

Loss on heating

%

≤2

≤5

PH value

 

4

4

Specific resistance

Ω.cm

≥4000

≥4000

Silica

%

≥98.5

≥98.5

Qualified ratio of spherical granules

%

≥90

≥90

Size

mm

2-5mm

2-5mm

Bulk density

g/l

780

780

Average pore diameter

nm

2.0-3.0

2.0-3.0

Specific surface area

m2/g

650-800

650-800

Pore volume

ml/g

0.35-0.45

0.35-0.45

Specific heat

KJ/kg.

0.92

0.92

Thermal conductivity

KJ/m.hr.

0.63

0.63

The moisture content, packing and size may be customized per your specific requirements

Packing

25kgs/bag or 500kgs/bag

Application

Mainly used for drying and moistureproof, may also be used as catalyst carriers, adsorbents, separators and variable pressure adsorbents, etc.

Introduction

Silica gel is transparent or ivory-white granular solid, main ingredients are amorphous silica. Silica gel does not dissolve in water and any solvents, non-toxic tasteless, not burning. Silica gel has stable chemical properties, does not react with any material except the strong alkali, hydrofluoric acid. Silica gel has open porous structure, high adsorption properties, good thermal stability, stable chemical properties, high mechanical strength, etc.

Added dilute sulfuric acid (hydrochloric acid) into the aqueous solution of sodium silicate and let standing, thus becoming solid aqueous silicate gel. Used water washing to remove Na+ and SO4 2- (Cl-) ions dissolved in the electrolyte, after drying it is silica gel. Different manufacturing methods form different microporous structure, different microporous structure form different models, such as macroporous silica gel, silochrom (type C silica gel), type B silica gel, fine-pored silica gel (type A silica gel).

Silica gel used for gas drying, gas absorption, liquid dehydration, chromatography, catalysts, etc.

Regeneration temperature

Silica gel can be removed moisture by the way of thermal desorption, desorption temperatures as follows:

Type C silica gel≤600℃

Type A silica gel≤200℃

Allochroic silica gel≤120℃

Silica alumina gel≤350℃