"CNS 7748-1993 Pulp Viscosity Test Method (Cannon-Fenske Capillary Viscometer Method) " stipulates the method of determining the viscosity of pulp using a Cannon-Fenske capillary viscometer. This standard applies to bleached cotton pulp, bleached wood pulp and unbleached pulp with a lignin content of not more than 4%. The viscosity of the pulp is calculated by measuring the outflow time of the pulp solution in the capillary tube, combined with the known viscometer constant. This method is simple and accurate, and provides an important basis for pulp quality control and production process optimization.