Nitrocellulose Mixed Ester (MCE) Membrane Filters, Sterile Individual Pack (no pad), gridded, 0.45 Micron, 47mm, 100/Pk (A045H047A) Our sterile, white, gridded, Mixed Cellulose Esters (MCE) membranes --a versatile mixture of cellulose nitrate and cellulose acetate fibers-- are general purpose filters with high recovery rates, high porosity, and superior flow rates.