Nylon membrane disc filters: 0.45 µm pore-size, 90 mm diameter, pack of 25. Hydrophilic, low-extractable, inert, durable material supported by an internal polyester web. Typically used for HPLC, microbiology, medical/clinical, and general filtration. SKU NY459025 Manufacturer Sterlitech Pore Size 0.45 Diameter (mm) 90 Pack Size 25 Grid No $73.86