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Microfiltration is a type of physical filtration process where a contaminated fluid is passed through a special pore-sized membrane to separate micro-organisms and suspended particles from process liquid. Microfiltration usually serves as a pre-treatment for other separation processes such as ultra-filtration, and a post-treatment for granular media filtration. Membranes enable a very convenient, fast and economical separation. Often they are used as a neutral sample support for further analysis.

Johnson Test Papers offers membrane filters (also known as screen filters) covering pore sizes from 0.03 to 10 µm that allow only smaller particles to pass through. Membranes, or membrane filters, can be validated for 100% retention of contaminants larger than their pore size. Our membranes are available in different forms of polymers (PTFE, regenerated cellulose, nylon, cellulose nitrate, cellulose acetate, PP, etc.) provides the user with an array of solvent compatibility options, porosities, and pore sizes depending on the filtration task.. Some membrane materials are also available in sterile format.

Membrane filters are typically used in both liquid and air filtration. These filters are placed at the furthest possible point in a system to remove the last remaining traces of resin fragments, carbon fines, colloidal particles, microorganisms or other undesirable contaminants. They offer accurately controlled pore size distribution with high strength and flexibility and are a suitable choice for a wide range of applications such as basic research, environmental testing, cell retention, particle collection, clarification and sterile filtration of aqueous solutions, particulate analysis, microbiological analysis, epifluorescence microscopy. and pharmaceutical as well as food and beverage industries. Johnson Test Papers offers a complete line of microfiltration products for laboratory applications including membranes, syringe filters as well as bottle top systems.

Below are the categories for Membranes