Whatman Grade 934-AH borosilicate glass microfiber filters from GE are smooth water quality filters with high retention efficiency. Grade 934-AH filters are often used in total suspended solids analysis. Smooth surface for efficient precipitate recovery Nominal particle retention of 1.5  µm Can withstand temperatures up to 500° C Fast filtration speed Discover other binder-free Whatman glass microfiber filters from GE Healthcare Life Sciences business. Options are available with different wet-strengths, loading capacities, filtration speeds, and particle retentions to meet your analysis needs. Total suspended solids analysis (previously called non-filterable residue) requires high loading capacity glass microfiber filters, such as Whatman Grade 934-AH. These filters are also used in cell harvesting, liquid scintillation, and air pollution monitoring.