High purity, thin PTFE membrane in a sequentially numbered chemically resistant polypropylene support ring. Membrane has low tare mass for accurate gravimetric determinations. The unique thermally stable design eliminates curling, keeping the membrane flat and making the filter robot-friendly.

• Polypropylene support rings for robotic air sampling
• Thermally stable design eliminates curling, keeps the membrane flat, and makes the filter robot-friendly
• Sequentially numbered filters
• Low tare mass for accurate gravimetric determinations

One of the major applications for the PTFE membranes is the clarification of corrosives, solvents, and aggressive fluids. This includes the important requirement in HPLC analysis for sample filtration where any solid particles can cause permanent damage to the column. Air and gas sterilization make use of the hydrophobic characteristics of PTFE membrane filters and their ability to stop aqueous aerosols.

Continuous air monitoring methods require a chemically resistant air sampling filter material that can withstand environmental pollution potentially containing a variety of contaminants and can still deliver accurate results.

PM2.5 PTFE membrane filters from Cytiva business also feature a thermally stable design, making them ideal for ambient air monitoring. These membranes come in a polypropylene support designed for use in robotic air sampling of ambient air pollution.

Alkalinity Max.: 25 µeq/g of filter - Test method: section 2.12 EPA/600/R-94/038b
Particle retention (0.3 mu m) Min.: 99.7% - Test method: ASTM D 2986-95a

Support ring width: 3.68 mm ±0.00 to 0.51 - Test method: template
Total support ring thickness: 0.38 mm ±0.04