The C20 label represents the Concrete’s Compression Resistance strength. Specifically, for C20, this strength measures at 20 N/mm2 per square meter after 28 days. Concrete comes in various grades with distinct resistances, ranging from C7 to C40. Among these grades, C7 is the least robust, while C40 can endure the highest pressure over an extended period. C20 occupies a middle ground on this scale, making it suitable for both domestic and commercial ventures.