A membrane filter is a matrix with channels which act as a screen and retain particles larger than the filter on the surface of the membrane. Membrane filters allow the retention of sub-micron particles and organisms.

The maximum operating temperatures for filter membranes are listed below.

• Silver Metal - 427°C
• Ceramic - 350°C
• Polycarbonate Track Etch - 140°
• Polyester - 140°C
• Nitrocellulose (MCE) - 130°C
• Nylon - 180°C
• Polyethersulfone (PES) - 180°
• Polypropylene - 82°C
• Cellulose Acetate - 135°C
• PTFE (Laminated) - 130°C
• PTFE (Unlaminated) - 260°C
• PVC Data not available 

What is hydrophilic vs hydrophobic membrane? 

Hydrophilic filters posses an affinity for water and can be wetted with almost any liquid.

a wide variety of hydrophilic membranes, including: 

• Silver Metal
• Polyethersulfone (PES)
• Glass Fiber
• Polycarbonate Track Etch (PCTE)
• Polyester (PETE)
• Mixed Cellulose Esters (MCE)
• Nylon
• Cellulose Acetate
• PVC Silica-Free

Hydrophobic filters lack an affinity for water and are best suited for venting applications. Example of hydrophobic filters are polypropylene membranes and S PTFE (Teflon ), either laminated or unlaminated.