The technical indicators of filter paper can be mainly divided into two aspects, one is the filter characteristics of filter paper, and the other is the physical characteristics. Filtration characteristics include air permeability, maximum aperture, and average aperture. Physical properties include quantification, thickness, stiffness, break resistance, resin content, etc.
Quantitative: refers to the quality of filter paper per square meter, unit: g/m2.
Thickness: Thickness of filter paper, not including corrugating depth. The unit is mm.
Air resistance: the resistance of filter paper to air flow. It is expressed by the pressure drop value obtained by 85 liters of air in one minute with a 100cm2 filter paper. The unit is mbar. Or water column height.
Corrugated depth: the depth of the groove pressed to strengthen the longitudinal stiffness of the filter paper, in mm. Under normal circumstances, its value is 0.2mm.
Air permeability: The amount of air passing through the filter paper per unit time under a certain area and a certain vacuum. The unit is l/m2·s.
Maximum aperture: The diameter of the largest sphere that can pass through the filter paper. Unit: μm.
Average aperture: The aperture calculated by the "burst" bubble pressure is called the average aperture. The unit is μm.
Resin content: Resin as a percentage of filter paper weight.
Stiffness: filter paper deformation ability. Unit: mg.
Breaking resistance: the maximum pressure of filter paper per unit area. Unit: Kpa.