The TE range of filters by GE Whatman feature polypropylene support material for improved strength and handling, while the PTFE filter is chemically stable and inert making them suitable for use with aggressive organic solvents, strong acids and alkalis.
Temperature resistant up to 120°C
Can withstand aggressive solvents, liquids and gases that may damage other membranes
Polypropylene support material for improved strength and handling
One of the major applications for the PTFE membrane 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. The 0.45µm pore size is normally used for HPLC applications.
Air and gas sterilization make use of the hydrophobic characteristics of PTFE membrane filters and their ability to stop aqueous aerosols. Pore sizes of 0.2µm and 0.45µm are typically used in these tasks.
Sterile venting of vacuum manifolds, fermentation vessels and filtrate tanks and containers use PTFE 0.2µm membranes.
The TE range use a randomly arranged polypropylene support material.