... ( Expansive Mortar/ Soundless Cracking Agent) is a kind of grey powder. It consists of calcium oxides, silicon dioxide, ferric oxide and little other ... 0 Mpa, they are equal to 1/10-1/20 of their compressive strength). Therefore, reasonable hole design can easily ... no noise, no vibration, no flying rock during the process of demolition. Comparing with explosive or other demolition tools, the BREAK ...