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Engineers didn't pick wrong application, the other 10,800 o-rings worked good.
The temperature at launch was too cold for the design.
https://www.space.com/31732-space-shuttle-challenger-disaster-explained-infographic.html
O-Ring History original 02132013
Niels Christensen perfected and patented the o-ring.
An o-ring is a solid rubber seal shaped like a doughnut or torus. When pressed between mating surfaces, an o-ring blocks the passage of liquids or gases.
An o-ring is a solid rubber seal shaped like a...
3-904 NBR 90
As the name implies, these O-Rings are used to seal Straight Threaded Tube Fittings. ... Straight Thread Tube fittings are often used in relatively high pressure applications, so most often a 90 durometer NBR or FKM O-Ring is specified.
Nitrile rubber (NBR, HNBR, HSN, Buna-N): a...
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