Crude gypsum is used as a fluxing agent fertilizer filler in paper and textiles and retarder in Portland cement About threefourths of the total production is calcined for use as plaster of Paris and as building materials in plaster Keenes cement board products and tiles and blocks
Parameters Gypsum 1 Gypsum
Moisture Content : Max 30
Sieve : Tests
50 mm : NIL
400 mm : MAX 100
5mm : Max 300
SiO : Max 50
MgO : Max 20
SO : Min 380
Total Alkalies as Na O : Max 010
Chloride content : Max 05
Combined Water : Min 163
Purity : Min 780
Parameters Composition Percentage
Calcium Oxide CaO 30 Min
Sulphuric Anhydrids SO3 42 Min
Silicon of Oxide SiO insoluble Matter 2 Max
Magnesium Oxide MgO 04 Max
Ferric Oxide Fe2O3 04 Max
Aluminium Oxide AI2O3 03 Max
Moisture 1 Max
Gypsum asCaso42H2O 90 Min