Whatman 1827-042 Filter Circles, 42.5mm Dia, Binder Free Grade 934-AH, 100/pk (PN:1827-042)

“Grade 934-AH” refers to a specific binder-free borosilicate glass microfiber filter grade that offers medium particle retention and high loading capacity. It’s designed for general laboratory filtration tasks where broad-spectrum suspended solids capture is needed.

These filters have a nominal particle retention of ~1.5 µm, meaning they retain particles larger than about 1.5 microns while letting liquids and smaller particles pass through. This balance makes them suitable for many standard lab filtration tasks.

Grade 934-AH circles are commonly used for total suspended solids (TSS) analysis, removal of turbidity, air and water pollution monitoring, cell harvesting, and liquid scintillation counting, among other filtration tasks in research and environmental labs.

Being binder-free means that the filter media consists of pure borosilicate glass fibers without added adhesives. This results in higher chemical inertness, lower extractables, and reduced interference in analytical work.

Yes — the high-grade borosilicate glass microfiber construction allows these filters to withstand elevated temperatures (up to several hundred °C) and makes them suitable for processes involving heating or drying.