Water container - for coal mine explosions of hard foam polyurethane with pre-weakened fracture points

摘要

The container for emergency water points to dampen flame in a coal mine explosion consists of hard polyurethane foam which is structured during the foaming process to give a dense outer layer with a smooth surface, and a more porous inner layer, with weak points engineered into the structure to release water in a surge when fractured by the pressure of a pit a explosion. The polyurethane foam is resistant to temperatures =100 degrees C, and can be easily handled for mounting in a coal mine.