Sourced to meet strict specifications in technical applications, the Filter Circles, Qualitative, Grade 4, Dia.: 42.5 Mm, are designed for efficient filtration of coarse particles and gelatinous precipitates such as ferric hydroxide and aluminium hydroxide. These filters exhibit an impressive filtration speed of 37 seconds, making them ideal for routine clean-up of biological fluids or organic extracts during analysis. With a particle retention range of 20 to 25 microns, they are particularly useful in air pollution monitoring where high flow rates are essential and the collection of fine particles is not critical. Manufactured by the renowned brand Whatman, these filter circles boast a weight of 96 grams per square meter and a thickness of 0.2 millimeters, ensuring durability and consistent performance.

• Category: Qualitative Filter Papers
• Thickness: 0.20 mm
• Diameter [mm]: 42.5
• Filtration speed: 37 s
• Filtration time [s]: 37
• Weight: 96 g / m2
• Ash: 0.06 %
• Filter type: filter circle
• Particle retention: 20 to 25 µm
• UNSPSC 13.5: 41104929
• Type: Sorte 4
• Brand: Whatman