"These syringe filters offer a choice of filter media: hydrophobic PTFE membrane for exceptional chemical and temperature compatibility -hydrophilic nylon GHP membrane, diam. 25 mm, pore size 0.45 μm - Sigma-Aldrich. Acrodisc® syringe filters GHP membrane, diam. 25 mm, pore size 0.45 μm; find -Z259845 MSDS, related peer-reviewed papers