Canadian Standard Freeness Tester (CF-21)
Measures the rate of drainage of a diluted pulp suspension. The drainage rate is related to the surface conditions and swelling of the fibers. It is widely used to track the changes in the drainage rate of various chemical pulps during beating and refining.The Pneumatic Canadian Standard Freeness Tester (CF-21) is designed to give a measure of the drainability of a pulp suspension in water. The %u201Cfreeness%u201D of pulp, or drainage rate, is related to the surface conditions and swelling of the fibers and is a measurable index of the refining degree of pulps.