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Stephanie Kwolek, Kevlar® Inventor
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Stephanie Kwolek holding a button that reads, “Ask me about Kevlar”

Stephanie Kwolek holding a button that reads, “Ask me about Kevlar”

Kevlar® Inventor

“All sorts of things can happen when you’re open to new ideas and playing around with things.”

One of the few women chemists at DuPont in the 1960s, Stephanie Kwolek’s work led to the development of Kevlar, a fiber best known for its use in bullet-resistant vests.

Kwolek’s research at the DuPont Textile Lab included experimenting with long molecules called polymers in order to develop lightweight, heat-resistant fibers. One day in 1965, while trying to dissolve one of the polymers, something strange happened.

“Ordinarily a polymer solution sort of reminds you of molasses, although it may not be as thick. And it’s generally transparent. This polymer solution poured almost like water, and it was cloudy. I thought, ‘There’s something different about this. This may be very useful.”

Convinced that this unusual solution could be spun into fibers, Kwolek spent several days urging her colleagues to spin it and test its physical properties. They were all amazed when the test results revealed how strong, stiff, and yet lightweight the fiber was.

From the time Kwolek first stirred that solution in a test tube, it took six years to produce Kevlar commercially. “It turned out to be a great team effort in the end.”

Next: What is a Polymer?

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