Hydrophilic membrane, low protein adsorption, suitable for filtration of biological products, such as protein solution filtration, microbial analysis, particle Syringe Filters – Glass, PTFE, PES, PP, Nylon, & More – Chrom Tech. Our HPLC syringe filters are an economical and easy way to filter lab samples. Choose appropriate pore size, membrane, and diameter for your unique samples. Syringe Filters – Sigma-Aldrich