Whatman 7182-002 Cellulose Nitrate Membrane Circle, plain, 0.2 um pore size, 25 mm, 100 per pack. Regular Price $153.32 Price $133.15. Add to Cart. Add to Wish List. Whatman Nuclepore Hydrophilic Membrane, 0.2 µm Pore Size, 47 mm Circle, 100 Pack, 10417012. Regular Price $173.86 Price $150.98.