can't read?
Potassium fluoride is the chemical compound with the formula KF. After hydrogen fluoride, KF is the primary source of the fluoride ion for applications in manufacturing and in chemistry.
P 2245 (OTTO) Potassium fluoride, anhydrous, 98% Cas 7789-23-3 - used in a study of ion-specific swelling and de-swelling of ampholytic polymer gels.