An accidental discovery in 1938 triggered a global contamination with a toxic footprint of “forever chemicals” that persist in 98% of the world’s population.
Polytetrafluoroethylene (PTFE), marketed as Teflon, revolutionized industries from nuclear to domestic, but its production released toxic substances that DuPont concealed for decades while contaminating water, soil, and living organisms.
The serendipitous discovery that changed everything
In 1938, chemist Roy J. Plunkett of DuPont was trying to create a safe refrigerant when he discovered a white powder resistant to acids, bases, and solvents, leaving a toxic footprint. This material – future Teflon – stood out for its carbon-fluorine bonds, the most stable in organic chemistry.
During the Manhattan Project, DuPont used it to contain the corrosive uranium hexafluoride, accelerating the production of atomic bombs. “As far as I know, it was never considered a substitute,” admitted Gordon Fee, manager of the nuclear plant.
Commercial expansion and the hidden chemical
After the war, Teflon flooded homes: non-stick pans (inspired by engineer Marc Grégoire’s wife in 1954), waterproof fabrics, and even medical implants.
To produce it on a large scale, DuPont bought from 3M perfluorooctanoic acid (PFOA or C8), a surfactant that prevented explosions in manufacturing. Internal studies since 1961 revealed its toxic footprint: rats died with 570 mg/kg, and dogs and monkeys suffered multiorgan damage. Nevertheless, DuPont dumped 10 tons annually into the Ohio River from its Washington Works plant.
The cover-up and citizen’s struggle against the toxic footprint
In the 90s, farmer Wilbur Tennant documented how his cows were dying with tumors, black teeth, and white foam in wells near the factory. His lawyer, Rob Bilott, discovered in 60,000 DuPont documents that:
- The water contained 1,600 ppb of PFOA, 2,600 times above the internal “safe” limit (0.6 ppb)
- Studies showed links to cancer in animals since 1980
- DuPont detected PFOA in workers’ blood and public water in 1984 but took no action.
“I never saw anything like this in corporate documents,” said Bilott. After a class-action lawsuit, a seven-year study involving 70,000 people confirmed in 2013 that C8 increased risks of kidney (up to 1 in 22), testicular, and thyroid cancer.
The indelible legacy
Although DuPont/Chemours replaced PFOA with GenX (a shorter chain), it causes the same tumors in rats and is more mobile in the environment. PFAS -14,000 substances with carbon-fluorine bonds – are in rain, Antarctic ice, and 100% of human blood samples analyzed since 2007. A recent analysis on the video author showed 17.92 ppb in blood, double the U.S. average, linked to contaminated water in Santa Clarita (California).
How to confront the crisis of the toxic footprint?
In April 2024, the EPA set historic limits for drinking water:
- PFOA and PFOS: 4 parts per billion (equivalent to a drop in 5,000 Olympic-sized pools)
- GenX: 10 parts per billion
Certified filters (reverse osmosis, activated carbon) reduce exposure, but the real solution is to capture PFAS at the source. Companies like PurAffinity develop materials that adsorb these chemicals before they contaminate. “If there is an incident with firefighting foams, we can filter the water 100% initially,” explains a technician.
Menstruation, breastfeeding, and blood donation decrease body levels – firefighters reduced their PFAS by 30% by donating plasma annually. Despite regulatory advances, the burden falls on informed consumers who reject products with PFAS, emulating the elimination of lead or asbestos. As a researcher points out: “Consumers are demanding changes, and companies are responding.”
