Perma Pure is the Exclusive Manufacturer of Nafion™ Tubing Ideally suited for Medical Moisture Transfer

Perma Pure has exclusive rights to manufacture Nafion™ tubing. The Nafion™ polymer must be chemically converted to unleash its unique transfer properties. This conversion process is proprietary to Perma Pure. Each batch of our tubing is tested for water transfer rate and our products utilize Nafion™ tubing with various ID and OD sizes to achieve essential performance criteria,

About Nafion™ Tubing

Nafion™ tubing is very stable at high temperatures. As noted previously, its chemical resistance is similar to Teflon®, and very few things can attack it. Even samples containing high concentrations of very corrosive gases like hydrogen fluoride or hydrogen chloride can be dried or processed.

For medical device applications, Nafion™ tubing is surrounded by a braided mesh to protect it from contaminants. This braided mesh increases the ID of the Nafion™ tubing Dryer by 0.60”. Various fitting options can be molded to the braiding; standard end fittings types include barbs, male and female leurs. We can design custom fittings if needed.

No energy is needed to remove moisture from a breath sample with Nafion™ tubing. When adding humidity to a gas stream using a liquid water source, energy could be required to obtain higher levels of humidity transfer. Water needs energy to convert from liquid phase to vapor phase. Heat is not required if the source is a highly humid gas environment.

Nafion™ Tubing Biocompatibility

Perma Pure tested our Nafion™ tubing for Biocompatibility. Tests performed on the dryer included Dermal Sensitization, Primary Skin Irritation and Cytotoxicity. Testing meets ISO10993-5 & -10 standards.

Findings also shows that Nafion tubing has an ability to fend off microbial growth. Nafion™ tubing creates a zone of inhibition around itself where microorganisms will not grow;therefore it is antimicrobial in nature. More information on Nafion™ tubing biocompatibility test results is available upon request.

Nafion™ Tubing Cleaning

We are frequently asked whether Nafion tubing dryers can be cleaned. The answer is yes, but the performance can be effected. Perma Pure studies show that Sodium-containing disinfectants, such as bleach, Alconox, and other detergents, can reduce drying performance of the Nafion tubing by 50-60%.

How you clean: Use only deionized or distilled water.

  • Remove any solids or other visible deposits from the outside of the tubing and from the epoxy header.
    • Brush or scrub away any solids deposited on sample header.
    • Wipe off any dust or liquid residues from the tubing and header with a clean soft cloth.
  • Blow clean, dry air through the sample outlet end of the header to remove any entrained particles.
  • To dissolve any salt deposits within the tubing, briefly inject DI water into tubing bundle with syringe or plastic squeeze bottle. Do not immerse the headers of the dryer element in water or excessively wet the tubing inside the headers. Nafion™ tubing swells when exposed to water. If the tubing inside the epoxy headers becomes too wet, it may swell sufficiently to crack the rigid epoxy header.
    Caution: De-ionized water must be used. Nafion™ polymer is a cationic exchange material, and when exposed to liquid water will exchange the hydrogen from the sulfonic acid with any cations in the water.
  • Blow dry, oil-free compressed air through the dryer element tubing to remove any residual water.
    • Begin blowing dry air through the dryer element quickly after wetting the element. This will minimize the risk of damage to the dryer due to swelling of the tubing.
    • Continue for several minutes. This will reduce any swelling and restore the dryer to normal length.
  • If the element appears to be free of all salt deposits and remains relatively clear in color, proceed to Reassembly of the dryer.

Tap water can reduce performance.

Isopropyl alcohol, and other alcohols, should never be considered for use as a chemical disinfectant. Therefore, products containing alcohol should never be used as a method of cleaning Nafion™ tubing.

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