The GH Polypro (GHP) hydrophilic polypropylene membrane offers maximum chemical compatibility. GHP membrane offers low protein binding (96.5% recovery), and low extractables. Devices can be spun at 14,000g with leak-free operation. This is only for Pall Life Sciences, Model ODGHPC34. Acrodisc® Syringe Filters, 13mm, Pall Gelman - Pall Gelman