1.For mining, rock or concrete cutting and demolition; 2. High yield, Low cost; High efficiency. 3. Easy and ... (for the tensile strength, rock is 1.96-30Mpa while concrete is 1.5-4.0 Mpa, they are equal ... to 1/10-1/20 of their compressive strength). Therefore, reasonable hole ... AG. As usal, it can crack the materials in around 2-24 hours. It is soundless, non-explosive, no noise ...