Gypsum Board Making Process Tamil Language Pdf

The base of pastel chalks is calcium sulfate caso 4 , which is derived from gypsum caso 4 2h 2 o, an evaporite mineral formed by the deposition of ocean brine it also occurs disseminated in limestonehalk and dehydrated gypsum thus have similar origins and propertiesastels also contain clays and oils for binding, and strong pigments.