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Shark Oilfield Services Sized Calcium Carbonate Carb 25. Versatile Bridging Agent: Used for fluid loss control, lost circulation, and squeeze mixes in drilling fluids. Density Weighting: Increases density of WBM, OBM, and brine-based fluids up to 12 ppg. High Purity Material: Ground marble with specific gravity of 2.7-2.8 and white powder/granula appearance. Flexible Packaging: Packaged in 25 KG sacks or 1 MT bags for convenient handling and transport.