Pall Acrodisc Syringe Filters 25mm Pall Life Sciences Ptfe Membrane Case. Combining top-notch and uncompromising quality with an affordable price the Pall Acrodisc Syringe Filters 25mm Pall Life Sciences Ptfe Membrane 4219/ 28143-924 can fulfill your laboratory needs while still offering a great value for the money. Product Category Description: These syringe filters offer a choice of filter media: hydrophobic PTFE membrane for exceptional chemical and temperature compatibility; hydrophilic nylon membrane for excellent chemical compatibility with esters bases and alcohols and no prewetting; GHP (hydrophilic polypropylene) membrane for low protein binding; and hydrophilic PVDF (polyvinylidine fluoride) membrane for use in aqueous and nonaggressive solvent-based mobile phases. PVDF membrane is not for acetone DMF DMSO or bases >6N. All membranes are HPLC certified for low levels of UV-absorbing extractables. Typical hold-up volumes: