Rapid Set® is a brand of professional-grade cement products made with Rapid Set® Cement, a calcium sulfoaluminate (CSA) cement technology. Rapid Set products are engineered for high performance, versatility, low shrinkage, rapid strength gain, and long-lasting results – performance characteristics that save you significant time and money with reduced installation times, labor, and maintenance costs. Rapid Set gains structural strength in one hour. You can build faster and quickly put the structure or building into full service.