Nylon Membrane Filters, 0.2 Micron, 25mm, 100/Pk. Nylon membrane disc filters: 0.2 µm pore-size, 25 mm diameter, pack of 100. Hydrophilic, low-extractable, inert, durable material supported by an internal polyester web. Typically used for HPLC, microbiology, medical/clinical, and general filtration.