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These bottle-top filters are complete units equipped with a tubing nozzle for attachment to bottles (bottle-top) -Good chemical resistance -Connection seals on any standard bottles 33 to 45 mm -Can be used up to 50C Polyamide membrane filters (nylon) are used for the retention of fine particles and microorganisms in HPLC/FPLC solutions when the column packing is 10m. PTFE membrane filters are used for the retention of particles in organic solutions, strong acids, or aldehydes. Ideal for the filtration of HPLC solutions.