Whatman 1443-125 Filter Circles, 125mm Dia, Ashless Grade 43, 100/pk (PN:1443-125)

Whatman Grade 43 is designed for quantitative analysis and inorganic testing, including applications such as soil analysis, food testing, and environmental monitoring. Its ultra-low ash content makes it ideal for gravimetric analysis where samples are burned and weighed.

“Ashless” means the filter paper leaves extremely minimal residue (≤0.007% ash) after combustion. This is critical in analytical labs because it ensures accurate measurement results without contamination from the filter itself.

Grade 43 offers approximately 16 µm particle retention with medium filtration speed, sitting between Grades 40 and 41. It provides a good balance between efficient filtration and reliable particle capture.

This product features 125 mm diameter circular filter papers and comes in a pack of 100, making it suitable for standard laboratory funnels and routine analytical workflows.

Grade 43 is ideal when you need moderate particle retention with faster filtration than finer grades. It is often selected for workflows requiring both efficiency and accuracy, especially when processing multiple samples in analytical laboratories.