
Whatman PTFE PM2.5 Air Monitoring Membrane Filter, 2.0 µm, 46.2 mm, w/Support Ring, Sequentially Numbered, 50 Pack, 7592-104,

PTFE Membrane Filter, 2.0 μm Pore Size Fluoropore®, filter diam. 46.2 mm, hydrophobic | Sigma-Aldrich,

PTFE Membrane Filter, 0.2 μm Pore Size Omnipore, filter diam. 47 mm, hydrophilic | Sigma-Aldrich,

PTFE Membrane Filter, 2.0 μm Pore Size Fluoropore®, filter diam. 46.2 mm, hydrophobic | Sigma-Aldrich,

RephiQuik 50mm PTFE Filter RJF502210,