Qualitative Filter Paper FIS 09805D "90 MM x 180 Micrometer, Cellulose, Circle, Grade 1, Flat, Standard Grade, Medium Porosity, (0 reviews) Qty. Price: $18.99 / PK. Available: 21 PK. compare. Syringe Filter MER C0000663 Nylon Syringe Filter, 33mm Diameter, 0.45µm Pore Size, Outer Ring & Printing, Non-Sterile...