What is the recommended pH for FAS bleaching?

FAS performance is strongly affected by pH.

In practical pulp trials, an alkaline environment is generally used to activate the reducing system.

The exact optimum depends on:

Pulp furnish

FAS concentration

Temperature

Reaction time

Alkali dosage

Metal-ion concentration

Rather than providing one fixed pH for every mill, suppliers should establish a pH-response curve during the laboratory trial.