Tailored for precision-driven chemical tasks, Whatman's Qualitative Filter Papers, Grade 4, provide an efficient solution for filtering coarse particles and gelatinous precipitates like ferric hydroxide and aluminium hydroxide. These filter circles, with a diameter of 185 mm, offer a filtration speed of 37 seconds and retain particles between 20 to 25 microns. With a weight of 96 grams per square meter and a thickness of 0.20 millimeters, they ensure reliable performance for various applications, making them valuable tools in laboratories for the clean-up of biological fluids or organic extracts during analysis.

• Category: Qualitative Filter Papers
• Filtration speed: 37 s
• Diameter [mm]: 185
• Type: Sorte 4
• Thickness: 0.20 mm
• Filtration time [s]: 37
• Ash: 0.06 %
• Brand: Whatman
• Filter type: filter circle
• Particle retention: 20 to 25 µm
• UNSPSC 13.5: 41104929
• Weight: 96 g / m2