In Brief

Stephanie Kwolek, Pioneering Inventor of Kevlar, Dies at 90

DuPont Chemist Stephanie Kwolek
Chemist Stephanie Kwolek at work in DuPont's Pioneering Research Lab in 1967. (Image credit: Courtesy of DuPont)

Scientist Stephanie Kwolek, who invented the ultra-tough synthetic fibers used in Kevlar body armor, has died at the age of 90, her colleagues announced today (June 20).

Kwolek died Wednesday (June 18) in Wilmington, Delaware, following a weeklong illness, reported the Associated Press.

The pioneering scientist made her fateful discovery in the mid-1960s, as a scientist for the American chemical company DuPont, according to the AP. She invented a liquid crystal solution that, when spun at blistering temperatures of more than 392 degrees Fahrenheit (200 degrees Celsius), could produce lightweight fibers that are stronger than steel.

Kevlar is now widely used in protective armor for soldiers and police officers. The material is also used in some tires, sports equipment and electronics.

Kwolek retired from DuPont in 1989, and was inducted into the National Inventors Hall of Fame in 1994.

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Denise Chow
Live Science Contributor

Denise Chow was the assistant managing editor at Live Science before moving to NBC News as a science reporter, where she focuses on general science and climate change. Before joining the Live Science team in 2013, she spent two years as a staff writer for, writing about rocket launches and covering NASA's final three space shuttle missions. A Canadian transplant, Denise has a bachelor's degree from the University of Toronto, and a master's degree in journalism from New York University.