Whatman 1441-110 Filter Circles, 110mm Dia, Ashless Grade 41, 100/pk (PN:1441-110)

Whatman Grade 41 is a quantitative ashless filter paper designed for precise laboratory analysis where residue must be minimized. It is commonly used for gravimetric analysis, environmental testing, and metal analysis after sample digestion.

This filter paper provides approximately 20–25 µm particle retention and is known for its fast filtration speed, making it one of the quickest options in the ashless filter paper range.

Grade 41 has an extremely low ash content (~0.007%), meaning it leaves virtually no residue after burning. This is critical for accurate quantitative analysis, especially when measuring trace elements or metals.

This filter is ideal for coarse particles and gelatinous precipitates, such as iron or aluminum hydroxides. It is widely used in soil testing, air pollution analysis, and preparation of samples for spectroscopy or chromatography.

This product features a 110 mm diameter, is made from high-purity cotton cellulose, and is supplied in packs of 100. It combines high flow rate, consistent performance, and excellent chemical purity for demanding lab workflows.