... %dust,improve working environment. I use: coal injection ,dust-fall,coal preesure reduction,coal-crack,methane drainage,etcII. Function1. moisture ... some gas,and reducing the gas content in the coal body;2. It can reduce the 80%dust, ... purpose of hole sealing and coal breaking. 2.The device can be used for several times repeatedly. To unload ... 10544-2003 Water Injection and Hole-Sealing Device for Coal