Frequently Asked Questions
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PTFE FAQ
How are ePTFE membranes characterized?
Aspire membranes are assigned a reference pore size according to bubble point test data but, there are other ways to characterize a membrane:
- Absolute Pore Size
- Bubble Point
- Mean Pore Flow
- Nominal Pore Size
- Retention Rating
Which side of a laminated PTFE membrane should face the solution?
The Smooth PTFE side should face towards the feed solution or liquid ingress.
Are the Advantec unlaminated PTFE hydrophilic membrane filters permanently hydrophilic?
Advantec unlaminated hydrophilic PTFE membrane filters are not permanently hydrophilic. Once the membrane is wetted, it can revert to hydrophobic behavior if it is allowed to dry. In addition, the membrane may become hydrophobic after autoclave sterilization or other exposure to temperatures above 100 °C.
What are the advantages of PTFE membrane filters?
PTFE (polytetrafluoroethylene) membrane filters are extremely hydrophobic and offer exceptional chemical compatibility, making them ideal for aggressive solvents, acids, and bases. PTFE membranes are widely used for venting, gas filtration, and solvent filtration applications where liquid repellency, high purity, and chemical resistance are critical.
