Karstic formations can impose many challenges for mining and infrastructure. These underground passages often channel water into unwanted areas. In this instance, a sinkhole opened in a stream bed, traveled through karst, and was emptying into a quarry. To stop the water from traveling down the sink hole and to return the water to its normal flow, the polyurethane grout Hyperflex was used.
Hyperflex is a single component hydrophobic polyurethane that reacts with water to produce a flexible foam. Hyperflex was simply poured down the holes and was carried throughout the voids by the water. The raw Hyperflex reacted (foamed) with the presence of water. The foam then sealed off the leak paths. Hyperflex is NSF/ANSI/CAN 61 approved for contact with potable water. Hyperflex is produced by SealGuard, Inc.
