**2.9 Resistance to chemical agents**

The reaction of fibers to chemicals varies a lot according to their types. But generally, nature fibers of vegetable origin are weak in acids and strong in alkalis. Other natural fibers of animal origin are strong in acids and weak in alkalis. The man-made fiber, fibers of the cellulose series are weak in both acid and alkali, whereas synthetic fiber is stable to a certain extent in acid also and alkali also.
