Teflon

Teflon (pronounced tef-lon)

(1) The trademark for a fluorocarbon polymer with slippery, non-sticking properties; the (chemically correct) synonym is polytetrafluoroethylene.

(2) In casual use, facetiously to denote an ability to evade blame, applied usually to certain politicians, those characterized by imperviousness to criticism, often as “teflon president etc”.

1945: The proprietary name registered in the US by the du Pont corporation, from the chemical name (poly)te(tra)fl(uoroethylene) + the –on.  The use of the -on suffix in science is often described by etymologists as “arbitrary” and in the narrow technical sense the point is well made but there is history.  In physics it was applied on the model of the “on” element in electron, something lent linguistic respectability by the Ancient Greek -ον (-on), used to end neuter nouns and adjectives.  In chemistry, it followed the “on” in carbon, applied to form names of noble gases and certain non-metal elements (creating first boron and then silicon).  In physics, mathematics and biology, it was appended to form nouns denoting subatomic particles (proton), quanta (photon), molecular units (codon), or substances (interferon).  In biology and genetics, it was used to form names of things considered as basic or fundamental units (such as codon or recon).  The derived forms teflonish, tefleony etc are late twentieth century creations from critical political discourse.

Teflon was a serendipitous discovery which was delivered by research on refrigeration gases being undertaken by the Du Pont Company in 1938.  Some of the experiments being performed involved an analysis of the behavior of various compounds of Freon in cylinders and, observations indicated that while the gas appeared to disappear from the cylinders, weight measurements suggested it remained present and, upon inspection, what was found in the cylinders was a white, waxy substance of no use in the process of refrigeration.  The substance did however have remarkable properties, being friction-free (described as being like rubbing wet ice against wet ice) and impervious both almost all solvents and temperature variations between -273–250^o c (-169–121^o f).  Chemically the substance was a form of polytetrafluoroethylene, thankfully shortened to "Teflon" ((poly)te(tra)fl(uoroethylene)).  The significance of Teflon wasn’t initially understood and Du Pont’s major product release that year was anyway nylon, finally available as a commercial substance after thirteen years of development.

Teflon did however soon have an impact in one of the century’s most significant scientific and engineering projects, those attached to the Manhattan Project developing the atom bomb finding it the only coating which worked as seals for the canisters housing the most volatile elements.  However, because of the secrecy which enveloped the Manhattan Project, some aspects of which would not for many decades be declassified, Teflon didn’t enter the public consciousness until the late 1950s, the timing ensuring it came to be associated with the nascent space programme rather than the A-bomb, a perception the military-industrial complex did little to discourage.  Because of the state of the analytical tools then available, it had taken a long time fully to understand the stuff and it transpired the slipperiness came from a unique molecular structure, the core of carbon atoms being surrounded by fluorine atoms, creating a bond so strong that any other interaction was repelled, the chemical mix also accounting for the high degree of invulnerability to solvents and extremes in temperature.

The first extensive use was in electronics industry, first as insulation and corrosion protection for the copper wires and cables which carried the data for telephony and later computer networks but, as an example of the novel products it enabled, shatter-proof, Teflon-coated light bulbs went on sale but most far-reaching, revolutionary actually, was that it was Teflon which was used to hold the new and tiny semiconductor chips.  All those uses played a part in transforming the world but it was the simultaneous (and well-publicized) use in the Apollo Moon programme and the commercial release of the Teflon fry-pans which so cemented the association in public consciousness.  For some years, mystery shrouded how Du Pont managed to get the Teflon to stick to the aluminum or stainless steel with which fry-pans are made but, after the patents expired, it was revealed the classic trick was to sandblast the metal surfaces which left tiny indentations with irregular edges which worked like the clasps jewelers use to secure stones.  Once these tiny impressions were filled with Teflon, the final layer had something to which to adhere; Teflon attracting itself and repelling all else.  That was an wholly mechanical process but chemical processes were also developed to induce attachment to metal.

While some half a billion Teflon fry-pans were being sold, the slippery substance went on extensively to be used in architecture where its qualities of flame resistance and translucence were much appreciated and it proved uniquely suited to solving a problem which had for decades plagued engineers, the need for an insulator to prevent the corrosion endemic between the steel framework and copper skin of the Statue of Liberty.  Living structures also benefited, Teflon of great utility in the medical device industry because of its compatibility with living tissue, proving an ideal substance with which to construct artificial veins and arteries, heart patches and replacement ligaments although most inventive was probably the Teflon powder injections used to restore the function of vocal-cords.  Early in the twenty-first century, concerns were raised after the chemical perfluorooctanoic acid (PFOA), used in the production of Teflon, was found to be potentially carcinogenic.  The research didn’t produce direct evidence that it's harmful to humans but it was anyway replaced with a substitute, the wonderfully named GenX but this too has attracted concerns.

Teflon resistant: Although described by Representative Pam Schroeder (Democrat, Colorado) as “Teflonish”, one object did stick to Bill Clinton no matter what (and there was much "what").

The word Teflon is used also to refer to that small class of politicians to whom no blame, however well-deserved, seems to attach; whatever mud is slung, none of it ever sticks.  It seems first to have been used by Pat Schroeder (b 1940; Democrat Representative for Colorado in the House 1973-1997) who in a speech on the floor of the House in 1983 denouncing President Ronald Reagan (1911–2004; US president 1981-1989) said “He has been perfecting the Teflon-coated presidency: He sees to it that nothing sticks to him.”  Schroeder later said that the expression came to her while frying eggs in a Teflon fry-pan.  In a display of feminist bi-partisanship, she would in a later interview with CNN note that President Bill Clinton (b 1946; US president 1993-2001) was very “Teflonish” and the phrase has come to be used to describe the political phenomenon of the willingness in voters to excuse in some the shortcomings they wouldn’t accept in most.  The linguistic adaptation didn’t please Du Pont which greatly valued their trademark, issuing a press release insisting that when used in print, the media should always put the trademark symbol next to the word and that ”It is not, alas, a verb or an adjective, not even when applied to the President of the United States!”  Their demands were ignored and English proceeds along its inventive ways.  There is nothing to suggest Teflon sales ever suffered by association.

Lindsay Lohan in a yacht's galley, cooking with non-stick frypan, Cannes, May 2017.

Teflon is produced from a mix of certain chemicals which are part of a large family of substances called perfluoroalkyl & polyfluoroakyl (PFAS) and research has linked human exposure to a number of conditions including some cancers, reproductive issues, and elevated cholesterol levels.  Given that, on the basis of the experience of litigation and legislative response to other once common materials found to be at least potentially dangerous, it might be expected an intensive research effort has at least quantified the extent of the problem.  However, it transpired it’s effectively impossible to measure the risks of the use of PFAS in non-stick, simply because for decades the chemicals have been so ubiquitous in domestic environments because of their role providing water & stain-resistance in everything from raincoats, carpets and car upholstery.  That means PFAS chemicals have long since become part of the environment, detected everywhere from the seabed to mountain tops.  For the human and animal population, the presence in the water supply is of significance and in the US, the Environmental Protection Agency (EPA) in 2020 published guidelines for the acceptable level of certain PFAS in drinking water, a document which attracted great interest because it appears about the same time as a study which indicated a correlation between exposure and a disturbing “millions of deaths”.  Among the general population, it’s the cookware which came quickly to attract the most concern, not because there’s any evidence to suggest the stuff is a more productive vector of transfer than carpet, curtains or any other source but because of the intimacy of contact; it’s from those non-stick frypans we eat.  It’s also in dental floss but the psychological threshold of swallowing is real.

Lindsay Lohan using non-stick frypan.  Note the metal fork; Ms Lohan is a risk-taker.

Not all PFAS are identical in the critical areas assessed although they all share the characteristic of being stable, something which has seen then dubbed the “forever chemicals”, something potentially useful for science although it’s the implication that once released, the stuff will persist in the environment for millions of years which disturbs.  Some have been identified as especially dangerous and two (PFOS & PFOA) have already been phased out of industrial use, notably because of a risk posed to the human immune system and encouragingly, testing revealed that after FOS use ceased in 2000, levels in human blood declined significantly.  Those who ensure they use only soft kitchen utensils when using the non-stick products shouldn’t be too assured because injecting a big chunk of the stuff historically hasn’t been the issue; it’s the micro-sized bits entering the body and while manufacturers claim any coating swallowed is inert, the concerns remain.  In the absence of relevant data, there are nuanced positions on non-stick pans. The US Food & Drug Administration (FDA) continues to permit the use in cookware while the EPA maintains exposure can lead to “adverse health effects” and in 2022 proposed a labeling protocol which would require certain PFAS to be listed as “hazardous substances”.  Another branch of the administration, the Center for Disease Control (CDC) maintains the health effects of low exposure remain “uncertain.”