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| Issue Number 10 |
JANUARY 2010 |
Tubing & Hose Buying Tips
#10: Moisture-Related Factors
It can be challenging to make sure you’ve covered all the bases during the tubing and hose selection process. Have you considered all the elements involved with the application? Temperatures, chemicals, pressures, flexibility needs? In Tubing & Hose Buying Tips we’ll address common selection factors, one at a time, in each issue of extrusions.
 Does your application involve water, condensation, or humidity? Tubing and hose materials react to moisture in different ways.
Some materials absorb water and other liquids, and that may be unacceptable. Absorption can cause the tubing to swell, so if the application involves dispensing measured amounts of a fluid, you may actually be getting less than the desired amount. Swelling can affect physical properties such as elasticity and tensile strength. Tubing that absorbs fluids can leach those fluids back into the stream and cause contamination in critical applications. Problems with fitting connections can occur, too, and applications involving a tight fit may be jeopardized.
Materials such as PVC and fluoropolymer have smooth, slick surfaces, leaving less opportunity for fluid adsorption. Others like ether-based polyurethane resist attack from moisture and help inhibit mold growth.
Be sure to check tubing and hose descriptions for information regarding moisture absorption when you believe it could affect your application’s performance.
PREVIOUS TUBING & HOSE BUYING TIP
#9: Reusing Tubing
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We are offering special discounts on select tubing, hose, & fittings products. These reduced prices are good while supplies last.
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