Millipore filters with binder resin have superior wet strength and are excellent for qualitative analysis and prefiltration, especially for heavily contaminated liquids. They are also widely used for clarification of aqueous solutions.

Type AP15: Low dirt-holding capacity. Recommended prefilter for 0,2 to 0,6 µm filters.

Type AP20: Low retention and high dirt-holding capacity than AP15 filters. Recommended prefilter for 0,8 to 8,0 µm filters. Use upstream to protect type AP15 filters.

Type AP25: Added thickness yields same retention and greater dirt-holding capacity as AP20. Recommended prefilter for 0,9 to 8 µm filters, especially for proteinaceous and heavily contaminated liquids. Use upstream to protect type AP15 filters.