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