How stable is Nafion?
Nafion is made from Tetrafluoroethylene (Teflon), the most chemical-resistant polymer available. Nafion has a strong acid group which reacts with some materials. These products are nominally trace organic materials present in air which are the result in incomplete combustion or chemical leakage of active products. The appearance of a slight color on the tubing from these organics does not indicate it has lost its drying properties. The dryers should be stored in polyethylene bags to prevent the color change. Nafion is very stable and will not undergo chemical changes unless exposed to water solutions containing salts. The product is thermally stable up to a temperature of 160°C (329°F). Nafion will not react with any of the usual gases and vapors present in monitoring applications.
