Whatman 1820-047 Filter Circles, 47mm Dia, Binder Free Grade GF/A, 100/pk (PN:1820-047)

“Grade GF/A” refers to a specific binder-free borosilicate glass microfiber filter with fine particle retention (~1.6 µm nominal), designed for general-purpose laboratory filtration where efficient particulate capture and high flow are required.

Binder-free glass microfiber filters are manufactured from 100 % pure borosilicate glass without added chemical binders. This makes them chemically inert, compatible with many reagents, and low in extractables, which is ideal for sensitive analytical applications.

Grade GF/A filters are commonly used for water and air pollution monitoring, wastewater and effluent testing, foodstuff analyses, algae or bacterial cultures filtering, protein filtration, and airborne particulate gravimetric analysis.

Yes — because they’re made of **borosilicate glass microfiber, these filters can typically be used at temperatures up to around 500 °C, making them suitable for applications involving heat or incineration steps.

These GF/A glass microfiber filters are hydrophilic, meaning they readily wet with aqueous samples and allow liquid to pass through easily. That makes them effective for liquid filtration tasks compared with hydrophobic media, which resist wetting.