Gypsum are maintained with higher filtrate calcium and lower alkalinity than lime fluids to increase their inhibiting affect on clays.
Gypsum are more resistant to salt and salt water than lime fluids, as long as solids are kept in line.
Gypsum are used when large sections of gypsum or anhydrite are to be drilled. Because of the limited solubility of CaS04 in water, additional gypsum or anhydrite will not dissolve into the fluid system but will be carried as a solid
Packaging = Jumbo Bag, 25 KG Bag