How are Carpets Rated?
Answers:
Density: The higher the density number, the more tightly it is tufted. Denser, more tightly tufted carpets will generally perform better under foot traffic
Twist: Tells you how many turns per inch each fiber is twisted. The more you twist a fiber the stronger it is
Tuft Bind: In loop pile carpets, is the measure of the amount of force required to pull the tuft from the backing
The A<B<C<D rating is used for usuage from Moderate to heavy.
Other answers: