Whatman Membranes - 0.45uM. Whatman 7140-104 Mixed Cellulose Ester Circle WME Range, 0.45 um pore size, sterile, individually packed, white, plain, with pad, 47 mm, 100 pieces. Regular Price $159.51 Price $138.52. Add to Cart. Add to Wish List. Whatman 7153-104, WME BL GRST 47MM 0.45 um 100/PK. Nylon filter membranes pore size 0.45 μm, diam. 47 mm, pack