The sterile microporous membrane is a filtration material made of high-molecular-weight chemical compounds, featuring a micro-porous structure with uniform pore distribution and high porosity, ensuring no medium detachment. It is primarily used for filtering aqueous solutions, often referred to as water system membranes. This type of membrane is non-toxic, hygienic, thin, low in resistance, fast in filtration speed, and has minimal adsorption. The filtration mechanism of the microporous membrane is surface filtration, ensuring precision and reliability in the filtration process. Depending on the manufacturing process, microporous membranes can be classified into various types such as flat sheet paper type, hollow fiber type, and tubular type.

The working principle involves utilizing the tiny pore size and uniform pore structure, allowing liquids or gases to pass through the membrane. Particles larger than the pore size are trapped on the surface, while those smaller can pass through. This filtration method effectively removes suspended solids while maintaining solution purity. The filtration process is a sieving process, where the raw material liquid, under the action of static pressure, passes through the microporous membrane to achieve the separation of specific substances. The material and pore size of the microporous membrane determine its separation efficiency. By selecting the appropriate pore size, it is possible to retain small solid particles and microorganisms in water, achieving the goal of filtration and sterility.

Its applications are widespread. In the field of biopharmaceuticals, it is used for filtering cell culture fluid to remove microbial contamination, ensuring a sterile environment for cell cultivation. In the food and beverage industry, it is used for clarification and sterilization of liquid products such as juices, alcoholic beverages, and milk, enhancing product quality and safety. In the chemical industry, it is employed for solvent filtration, removing tiny particles to ensure solvent purity. In the field of environmental protection, it is utilized for wastewater treatment, removing suspended solids and microorganisms to protect the environment.

Its advantages are mainly reflected in the following aspects:

  1. High filtration efficiency, effectively removing tiny particles and microorganisms.
  2. Good chemical stability and thermal stability, suitable for a wide range of temperatures and pH values. Moreover, it exhibits excellent biocompatibility and does not exert toxic effects on cells.
  3. Pore size can be adjusted by changing the preparation process to meet different filtration needs.
By 向阳 翟


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