Grade 4 Qualitative Filter Papers

The filter’s core benefit is its unparalleled speed and large retention capability of approximately 25 µm. This makes it an ideal first media in a multi-stage filtration process, protecting finer downstream filters from premature clogging. It is also commonly used for routine cleanup of organic extractions and biological fluid separation processes, as well as in air monitoring applications where the capture of fine particulates is not required. With a very low 0.05% ash content, this filter minimizes background interference for reliable qualitative analysis.

Features:

• Fastest flow rate available among qualitative cellulose filter media
• Coarse porosity with approximately 25 µm particle retention
• Ideal for use as the first media in a multi-stage filtration process (pre-filtration)
• Commonly used for organic extractions and biological fluid separation processes
• Very low 0.05% ash content ensures minimal background interference
• Available in a wide range of diameters (4.25 cm to 18.5 cm)