Technical specifications of cylindrical filter paper
Date: 2015-12-14Read: 22
Cylindrical filter paperGenerally, it can be divided into two types: qualitative and quantitative. In the application of analytical chemistry, when inorganic compounds are separated into precipitates through filtration, the residual material collected on cylindrical filter paper can be used to calculate the loss rate during the experimental process. Qualitative cylindrical filter paper produces a significant amount of cotton fibers after filtration, making it only suitable for qualitative analysis; Quantitative cylindrical filter paper, especially ash free cylindrical filter paper, can effectively resist chemical reactions through special processing procedures, resulting in less impurities generated and can be used for quantitative analysis. In addition to the cylindrical filter paper commonly used in laboratories, it is also used in daily life and engineeringCylindrical filter paperThere are also many applications available. Coffee cylindrical filter paper is one of the widely used cylindrical filter papers, and the outer layer of the cylindrical filter paper on the tea bag provides high flexibility and wet strength. Other air cylinder filter papers used for testing suspended particles in the air, as well as fiber cylinder filter papers used in different industrial applications.
Cylindrical filter paperThe technical indicators of the filter paper can be mainly divided into two aspects, one is the filtering characteristics of the cylindrical filter paper, and the other is the physical properties. The filtering characteristics include air permeability, air resistance, maximum pore size, and average pore size. Physical characteristics include quantification, thickness, stiffness, corrugated depth, burst resistance, resin content, etc.
Quantitative: refers to the mass of cylindrical filter paper per square meter, unit: g/m? .
Thickness: Refers to the thickness of cylindrical filter paper, excluding the depth of corrugations. Unit: mm
Air resistance: The resistance of cylindrical filter paper to air flow. Express the pressure drop value obtained by passing 85 liters of air through a 100cm2 cylindrical filter paper within one minute. The unit is mbar or water column height (mm).
Corrugated depth: The depth of the groove pressed to enhance the longitudinal stiffness of the cylindrical filter paper, measured in millimeters. Generally, its value is 0.2mm
Breathability: The amount of air passing through a cylindrical filter paper per unit time under a certain area and pressure (20 mm water column). The unit is: L/m2 · s
Nominal filtration accuracy: refers to the ability of cylindrical filter paper to retain particles of a certain size, based on the small spherical particle size that can retain or filter out 50%. Unit: μ m.
Zui large aperture: The gap size calculated based on the pressure at which * bubbles appear on the cylindrical filter paper sample during testing. Unit: μ m.
Average pore size: The pore size calculated based on the pressure during "dense" bubbling is called the average pore size. The unit is: μ m.
Resin content: The percentage of resin to the weight of the cylindrical filter paper. Usually 10%~30%
Stiffness: The ability of cylindrical filter paper to resist deformation. Unit: mg
Durability: The maximum pressure that a cylindrical filter paper can withstand per unit area. Unit: kPa.