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Nafion™ tubing is a highly selective, semi-permeable membrane to water vapor. If gases inside Nafion™ tubing are wetter than gases surrounding the tubing, drying will occur. If the surrounding gases are wetter, humidification will occur. In normal use, a portion of Nafion™ tubing is used as a portion of the tube between a gas sample stream and a sensor. If the sample stream is much wetter than ambient air (such as breath samples), the sample falls to ambient humidity. If the sample stream inside is much drier than ambient air (such as calibration cylinder gases), the sample rises to ambient humidity.
Because Nafion™ uses sulfonic acid sites to selectively transport water molecules out of the tubing, it is not gas permeable. Therefore, Nafion™ can be used successfully to dry virtually any gas as long as the chemical compatibility of Nafion is not being comprimised. Nafion™ is also recommended to be used with water traps and hydrophobic filters that are included with all sampling devices. Install the tubing after the filters for optimum performance and protection of the sensor.
|Product Code||Inner Diameter||Outer Diameter||Wall Thickness||Internal Volume (cc/ft)||Weight (H+ Form) (g/ft)||Price Per Meter|
All tubing tolerance is +/- 10%.
Nafion™ is not only highly resistant to chemical attack by the most common solvents (see the following PDF chart), it also exhibits highly selective absorption and transfer of compounds. Most substances are retained quantitatively. Although they do not attack or damage the Nafion™ tubing, some polar organic substances are absorbed and consequently lost. Ammonia and amines are also absorbed and lost to some degree.
For specific chemicals chemicals that we have performance and selectivity information for please view or download our PDF chart here.
Lead Time: 2 to 3 weeks to be expected.
Caution: While Nafion™ can remove virtually any humidity from a gas sample, filling it with liquid water will result in the loss of the ability to remove water vapor. Normally, drying the tubing completely will restore functionality.
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