Whatman 1827-021 Filter Circles, 21mm Dia, Binder Free Grade 934-AH, 100/pk (PN:1827-021)

Whatman Grade 934-AH filters are commonly used for total suspended solids (TSS) analysis, water quality testing, and environmental monitoring. Laboratories often rely on these filters to capture fine particulate matter when analyzing wastewater, drinking water, and industrial effluents.

These glass microfiber filters provide a nominal particle retention of approximately 1.5 µm, allowing them to efficiently trap fine suspended particles while maintaining strong flow rates for routine laboratory filtration.

Binder-free filters are made entirely from borosilicate glass fibers, which reduces the risk of contamination and improves chemical compatibility. This construction helps ensure accurate analytical results in applications such as environmental testing and chemical analysis.

These filters can withstand high temperatures up to approximately 550 °C (1022 °F). This makes them suitable for procedures that involve high-temperature drying, ignition, or gravimetric analysis.

The 21 mm diameter format is commonly used with small laboratory filtration setups, including microfiltration holders, vacuum manifolds, and specialized analytical filtration devices used in environmental and research laboratories.