In addition to consultations, we also offer a sample program that will be shipped to you right away. PTFE Membrane Filters, 2.0 um, 37mm with PP substrate, Nonsterile, 100 per pack, SF18117. Regular Price $110.48 Price $96.07. Add to Cart. PTFE Membrane Filters, 1.0 um, 82.6mm, Nonsterile, 50 per pack, SF16015. Regular Price $252.27 Price $219.37.