Description: 0.45 ?m pore size, used for filtration of inorganic water solutions Designed to give complete retention and maximum recovery of total coliforms and fecal coliform bacteria Made of refined nitrocellulose, hydrophilic and non-toxic Very even pore size, high porosity, no media shedding, thin thickness, less resistance, faster filtration and minimal adsorption Used for filtration of bacteria from liquids, gases, oils, beverages, sprinkles, electronic instruments, etc., can also be used as a test for particles and bacteria Specification: Certified to meet Standard Methods for the Examination of Water and Wastewater requirements. Pore Size: 0.45?m Color: White Diameter Outside: 50mm/ 2.0inch Package Includes: 50 Pieces Inorganic Filter Membranes Sheets in One Box Note: This product is flammable, should be sealed, moisture-proof and fireproof when stored