Certified ghp membrane on stock Acrodisc® Syringe Filters 4554 GHP Acrodisc Minispike, 0.2 µm, 13 mm 100/300 4556 GHP Acrodisc Minispike, 0.45 µm, 13 mm 100/300 4564 GHP Acrodisc, 0.2 µm, 25 mm 50/200 4560 GHP Acrodisc, 0.45 µm, 25 mm 50/200 4559 GHP Acrodisc GF, GF/0.45 µm, 25 mm 50/200 4472 Acrodisc CR PTFE, 0.45 µm, 4 mm 250/750 4552