Titan3 PTFE (Hydrophobic) Syringe Filter 0.45 µm, 30 mm, with Pre-Filter, 100 Pk. Diameter (Metric) 30 mm. Diameter (Metric) Membrane. 30 mm. Disposable. Yes. For Use With (Application) Sample Filtration: aggressive organic, highly basic, or hot solutions, aqueous solutions without prewetting with an alcohol.