low volume, viscous, particulate-laden or high volatility organic solvent Thomson has a Filter Vial to fit your needs. Key Features. Same Size as a standard HPLC Vial and will fit easily into any machine or tray available for standard HPLC vials. Available in PTFE, PVDF, PES and Nylon membranes. Pore sizes of either 0.2μm or 0.45μm.