HSCA-2 Standard Grade Stone Soundless Cracking Agent SCA-2 Stone Soundless Cracking Agent is a high-performance non-explosive expansive mortar formulated for standard-temperature applications where material temperatures range from 10°C to 25°C . This versatile grade is the most widely used formulation, suitable for spring, autumn, and moderate-climate projects year-round. After mixing with clean water at approximately 28–30% by weight and pouring into pre-drilled boreholes,