All-PTFE membrane with pure PTFE support layer to aid handling. Use in the most aggressive testing environments. The 2µm pore size meets NIOSH requirements for monitoring polynuclear aromatic hydrocarbons (Methods 5506, 5515). Retains 99.99% aerosols (DOP 0.3µm at 32Lpm through 100cm2 of filter media following ASTM D 2986-71). Available in 8 x 10" sheets, or disks. Typical thickness is 152.4µm (6 mils). Typical air flow rate is 25.3Lpm/cm2 at 520mm Hg (10psi).