I know a lot about this. The solid rocket booster propellant was a Hydroxyl Terminated Poly Butadine (HYPB) and aluminum dust type of propellant that had been shown to be unstable at low temperature from an accident rocket motor explosion that I worked on myself. It turned out that this explosion was not the same cause that I worked on, but the risk was known.
Proper spelling of solid propellant type is Hydroxyl-terminated polybutadiene.
There was a good documentary on the History Channel about the explosion and the Rogers Commission investigation. Reagan had appointed an outside physicist and expert, Richard Feynman, who really got the ball rolling on the seal and weather problem when some at NASA were determined to sweep it under the rug. I remember being in a meeting in Chicago and the server burst in to tell us about the explosion; sounded unbelievable at the time.