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CEMENT ADDITIVES » RETARDERS
GCR 1 Low-temperature cement retarder, optimum temperature range 120°F (49°C) to 175°F (79°C); normal concentration is 0.1 to 0.65% BWOC.
GCR 1L Liquid, low-temperature cement retarder; optimum temperature range 120°F (49°C) to 175°F (79°C); normal concentration is 0.02 to 0.13 gal/sk cement.
GCR 2 Cellulose cement retarder, enhances fluid loss control, effective from 140°F (60°C) to 230°F (110°C); increases viscosity of cement slurry; normal concentration is 0.2 to 0.6%.
GCR 3 Mid-temperature cement retarder; optimum temperature range 140°F (60°C) to 230°F (100°C); normal concentration is 0.15 to 1.0% BWOC.
GCR 3L Liquid, mid-temperature cement retarder; optimum temperature range 140°F (60°C) to 230°F (110°C); normal concentration is 0.02 to 0.5 gal/sk cement.
GCR 4 High-temperature retarder; optimum temperature range 205°F (95°C) to 300°F (149°C), normal concentration is 0.15 to 2.0% BWOC.
GCR 4L Liquid, high-temperature retarder, optimum temperature range 205°F (95°C) to 300°F(149°C); normal concentration is 0.03 to 1.2 gal/sk cement.
GCR 5 High-temperature retarder/dispersant; optimum temperature range 212°F (100°C) to 350°F (177°C); normal concentration is 0.3 to 2.0% BWOC.
GCR 5L Liquid, high-temperature retarder/dispersant; optimum temperature range 212°F (100°C) to 365°F (185°C); normal concentration is 0.15 to 1.5 gal/sk cement.
GCR 6 Selected retarder for thixotropic/expanding cement systems; effective below 212°F (100°C); normal concentration is 0.15 to 2.0% BWOC.
GRI 400 Retarder intensifier, utilized with GCR 4 to extend temperature limits to 400°F (205°C); optimum use level is 1 part GCR-4 to 2 parts retarder.
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