If you want some pretty good and fairly comprehensive info on Nylon,
then have a look here;

http://en.wikipedia.org/wiki/Nylon

Knowing the properties of various things allows one to make better
choices in their use, or even to avoid them, and also explains why
they behave as they do. The "blurb" published by various fishing
tackle manufacturers is virtually never accurate, or even useful. In
the majority of cases it is merely advertising bull****.

MC