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Sodium bentonite is most widely known for its ability to swell. It can absorb nearly 5 times its weight in water and at full saturation may occupy a volume 12 to 15 times its dry bulk. ... Oman Drilling Mud Products Co.LLC. 4. Composition Alumina and silica in the ratio of 1:4 m/m. soda ash content limited to 3% m/m. 5. Appearance and odour ...