网页PES Syringe Filters with GD-4 Pre-Filter, 0.22 um, 25mm PES Syringe Filters with GD-4 Pre-Filter, 0.22 um, 25mm, Sterile, 1000 per pack, GD17039 . Polyethersulfone Syringe Filters, 25mm, 0.22um with 4 total layers, the first Filter is a composite membrane of 10um glass fiber and 1.0um PP, the second preFilter is 0.7um GF/F membrane media, the last