High Quality Content by WIKIPEDIA articles! Rhoca-Gil is a type of industrial sealant produced by Rhone-Poulenc, used in the construction of tunnels to block the passage of groundwater into the tunnel. The sealant begins as a liquid, is then injected into cavities which need to be sealed, and polymerises, causing it to harden. Rhoca-Gil consists of two fluids, that are mixed, thinned out with water and then sprayed into cracks in the bedrock. One of the fluids contains acrylamide and methylolacrylamide. The mixed solution becomes a viscous fluid that penetrates cracks and holes in the rock, where the fluid reacts - polymerizes - to a tight plastic substance. When it is completely polymerized it is stable and will not exhaust any toxic compounds.

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