High-concentration colloidal silica

High-concentration colloidal silica( silicon dioxide, silica sol)Particle size 8-20(nm),low impurity, high diaphaneity, etc.

High-concentration colloidal silica( silicon dioxide, silica sol)
GS-40, GS-35 are two types of high-concentration colloidal silica. Their technical standards are listed below
Designation
Standard
GS-40
GS-35
Appearance
Slight milky transparent to translucent
SiO
2
(wt%)
40±1%
35±1%
Na
2
O (wt%)
≤0.7%
≤0.5%
PH (20°C)
9.5-10.5
9.0-11.0
Density (20°C,g/cm
3
)
1.280-1.295
1.24-1.25
Viscosity(25°C,mPaS)
10-35
≤20
Particle size (nm)
10-15
8-20

Packing & Storage
Colloidal silica is packed in 25kg,250kg or 1000kg plastic drums.
Store the colloidal silica at a temperature between 0 and 50, avoid exposure to the air, and insulate it from the sun.
Wash the empty drums as quickly as possible to avoid SiO
2
crystalline deposits.
If you want to remove the deposition from empty drums, use a 10-percent NaOH solution at 50~60.