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| Issue Number 6 |
AUGUST 2009 |
Tubing & Hose Buying Tips
#6: Taste & Odor Transfer Issues
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.
 If your application involves items such as foods, beverages, dairy products, laboratory fluids, or medicines, any taste or odor transferred to those products could be critical.
Some tubing and hose materials contain plasticizers (chemical agents) to facilitate processing and help the finished tubing or hose become flexible. Under certain circumstances these additives can leach out from the tubing or hose. They can appear in the streams conveyed by the tubing or hose or possibly affect the stream with a taste or odor. That may be fine if the line is used for drainage or a waste product, but if the fluid is part of a finished product that someone will consume, taste and odor transfer is usually a significant concern.
Certain tubing and hose materials (silicone and polyurethane, for instance) are naturally flexible. There are no plasticizers used in their manufacture, so the potential of taste and odor issues that can come from the use of plasticizers is eliminated. In any case, if taste or odor is a concern in your application, you should sample a candidate hose or tubing to test if the material might affect your stream.
PREVIOUS TUBING & HOSE BUYING TIP
#5: Compatible Ingrediants
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