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Get Acrobat Reader You will need Acrobat Reader to view pdf Process For Purity
All TEFLON® is not the same!

www.dupont.com/teflon Only TEFLON® PTFE processed by Resistoflex offers true protection against all sources of contamination. We've been making our PTFE hose liner for more than 45 years!

Resistoflex PTFE liners contain no plasticizers, fillers, or antioxidants that leach out and react with process fluids.

Properly designed sanitary fittings are a given. However, the surface area exposure of fittings is minimal compared to the hose liner.

Resistoflex hoses feature DuPont TEFLON® PTFE resin which meets every major high-purity classification:
  • USP Class VI
  • Meets 3A Sanitary Standards 20-15
  • Meetings FDA 21 CFR 177.1550
  • USDA Accepted
  • 3A Dairy Accepted

As can be seen in Fig. 1, rinse to background occurred within 5 minutes. Organics were determined by total organic carbon (TOC) analysis, which also can be seen in Fig. 2. TOCs were below background levels within 10 minutes.
This is where we begin. Following are the results of where we end with a product of unequaled purity. We challenge the competition to meet our standards.

In the effort to produce water of the highest purity for the semiconductor, pharmaceutical, and biotech industries, engineers are designing fluid handling systems that do more than just last for a sort period of time. These fluid handling systems must be designed to prove that they contribute less than parts per billion of extractables to the process water.

Particulate, ionic, organic, or microbial contaminates in process fluids reduce product yields dramatically requiring purity levels, which are orders of magnitude greater than yesterday's needs. One of the harshest and most widely publicized agents used for wet processing is deionized 18 megohm-cm water. To determine the effect 18 megohm-cm water has on Resistoflex PTFE lined hoses, an extractable analysis was conducted by AT&T Analytical Services. AT&T's analysis consisted of "dynamic rinsing" of Resistoflex PTFE lined hose samples and subsequent ionic characterization.

Particulate dynamic rinse data is show if Fig. 3. Particle count rinsed to background levels within 50 minutes, proving that Resistoflex PTFE liner has a very smooth, contamination-free surface that will not support microbe growth.

Finally, Inductively Coupled Plasma-Mass Spectroscopy (ICP-MS) data for 68 metals and anion analysis samples were taken at 24 hours of dynamic rinse exposure with 18 megohm water. In all cases, extractables were below detectable limits for Resistoflex PTFE hoses.

The use of ozone in ultrapure water processing has proven to be a quick and reliable method of microbial control. Ozonization of ultrapure water is considered a "clean" process and does not produce any undesirable chemical byproducts. Unlike traditional chemical disinfectants, ozone dissipates from the treated water due to its own natural decay properties. Because of this, ozone is gaining increasing popularity in electronics, pharmaceuticals, and other ultrapure water-dependent industries. However, the same aggressive nature that gives ozone the ability to attack and kill microorganisms also makes it especially tough on the materials with which it comes in contact. As opposed to silicone hoses, Resistoflex PTFE hoses are chemically inert and non-reactive with ozone.

Please contact Crane Resistoflex for AT&T's detailed report.


TEFLON® is a trademark of DuPont. Only DuPont makes TEFLON®.


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