| 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 |
Specialty Oil Field Additives