Details. PTFE Syringe Filters, Hydrophobic, 0.45 Micron, 13mm, 50/Pk. Aggressive solvents, acids, and bases. Filter organic-based HPLC samples. Degassing solvents. Aerosol sampling. Venting applications, sterilize air, gases, aerosols. Vacuum pump line protection. Filter viscous organic-based HPLC samples.