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needle-shaped filter are mainly used for analyzing of samples especially for the filtration of mobile phase and samples during the chromatographic analysis. They have the function of protecting chromatographic column and infusion pump system and sample valve from pollution. They are widely used for gravimetric analysis, microanalysis, colloid separation and sterility test. The membrane filter is made of different materials, such as PES, nylon66, acetic acid fiber and PTFE, etc. can be provided.
type of membrane filter: water fasten, organic fasten