OPC has three grades that we produce, that are differentiated by their compressive strengths, expressed in mega pascals (“MPa”), as specified by the BIS. These grades are 53-grade OPC, 43-grade OPC and 33-grade OPC, with 53-grade OPC having the highest compressive strength. The customer selects the grade of OPC based on the intended application. Our most popular cement, by sales volume, is 43-grade cement, with 53-grade cement being used in applications which require high strength characteristics.