WS PM-7421 is a surface modified, structured anionic silica sol for all pH ranges for improved starch retention and formation.

These products are often called "silica gels." If the pH is kept slightly on the alkaline side of neutral, then the subunits stay separated, and they gradually grow.

These products are often called silica sols. Hydrogen ions from the surface of colloidal silica tend to dissociate in aqueous solution, yielding a high negative charge. Substitution of some of the Si atoms by Al is known increase the negative colloidal charge, especially when it is evaluated at pH below the neutral point.

Because of the very small size, the surface area of colloidal silica is very high.

The numerous benefits resulting from its use have made WS PM-7421 a logical choice:

1. Additives and fines retention
2. WS PM-7421 also capable of increasing the amount of cationic starch that can be retained as a dry-strength agent.
3. Reduction of effluent suspended solids
4. Better pulps (decreased recirculation of colloidal fines)
5. Decrease in white water consistency
6. Reduced sheet strength variability
7. Improved pitch control
8. Lowest cost per ton in the industry

Wear suitable protective clothing, goggles and gloves. In case of contact, immediately flush eyes or skin with plenty of water for at least 15 minutes. For eyes, get medical attention. Remove and wash contaminated clothing.

If swallowed, drink large quantities of water. Do not induce vomiting and call a physician immediately.

Small spills may be flushed with water, larger spills should be soaked up with sand or other absorbent material and swept up for safe disposal.

Store in a cool place, away from products containing sulphite, nitrite, strong acids or oxidizing materials.

Before use review the Material Safety Data Sheet for additional information.

A.D.R. : 8-40c

Symbol : Corrosive (C)

R-phrases : 36

S-phrases : 25, 26