Wiring Harness News Jul-Aug 2022 - Page 34

The Unlikely Development , and Purposeful Use of Teflon
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34 JULY / AUGUST 2022 Wiring Harness News INDUSTRIAL INFO-TAINMENT

WIREwisdom

The Unlikely Development , and Purposeful Use of Teflon

The

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story of Teflon began April 6 , 1938 , at DuPont ’ s Jackson Laboratory in New Jersey . DuPont chemist , Dr . Roy J . Plunkett , was working with gases related to Freon ® refrigerants , another DuPont product . Upon checking a frozen , compressed sample of tetrafluoroethylene , he and his associates discovered that the sample had polymerized spontaneously into a white , waxy solid to form polytetrafluoroethylene ( PTFE ). PTFE is a high-molecular-weight compound consisting of carbon and fluorine . Perfluorocarbons or PFCs , are organofluorine that contain only carbon and fluorine bonded together in strong carbon – fluorine bonds . The carbon – fluorine bond is referred to as the strongest in organic chemistry because of stability added by its partial ionic character ; it forms the strongest single bond to carbon . The ionic character is a result of the electronegativity of fluorine . It induces partial charges on the carbon and fluorine atoms , leading to electrostatic attraction , making the bond short and strong . PTFE is a thermoplastic polymer , which , at room temperature , is a white solid with a density of about 2.2 g / cm ³ and melting point of 327 ° C . Its mechanical properties will degrade above 260 ° C . Polytetrafluoroethylene ( PTFE ) is a synthetic fluoropolymer of tetrafluoroethylene that is widely used in wire and cable and tubing products today . PTFE is inert to virtually all chemicals , and it is the most thermally-stable of all carbonaceous insulating compounds . It is considered the third most slippery material in existence . Because of PT- FE ’ s chemical inertness , it cannot be cross-linked like an elastomer . It has sunlight and moisture resistance . Because PTFE ’ s electrical properties are stable across a broad range of frequencies and its -90 º C to 250 º C temperature range , PTFE has been a standard in the aerospace / defense industry for many years . Popular specifications include MIL-DTL-16878 , MIL-W-22759 , MIL-DTL-17 and MIL-DTL-27500 . It is also used in numerous commercial applications . PTFE is an excellent dielectric for coax cables due to a low dissipation factor and low dielectric constant at low and high frequencies .

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