Whatman 1001-042 Filter Circles, 42.5mm Dia, Grade 1, 100/pk (PN:1001-042)

“Grade 1” refers to a standard qualitative filter paper with medium particle retention (about 11 µm) and a balanced flow rate. It’s the most commonly used filter grade in routine laboratory separations and liquid clarification tasks.

This product includes 100 filter circles with a diameter of 42.5 mm, a size compatible with many small funnel holders and vacuum filter setups used in routine lab work.

The filter circles are made from cellulose fiber — a hydrophilic material that effectively captures suspended solids in liquids during qualitative filtration.

These Grade 1 filters are versatile and widely used for clarifying liquids, separating precipitates, agricultural soil testing, seed analysis, food sample clarification, air particulate collection, and gas detection in qualitative lab procedures.

Yes — these small 42.5 mm circles can be used in appropriate vacuum filter holders or funnels designed for that size, helping speed up filtration without compromising filtration quality.