1 Force by 1% alegation is half of the value by 2%.
2 PA - NYLON
LT - leather and textile coverings
Those belts are used for standard applications in humid, dusty places and in the presence of oil. They are fit for the cross working. Mechanical, paper, textile industry; block cutters for marble and granite...
Use belts with the leather covering every time, you find the severe situations in which the belt must work, as above mentioned. Leather is a natural material with high absorbency for humid and oil, so those things will not be harmful for this belts.