OPC (Ordinary Portland cement) is also known by the name 'grey cement'. The 43 grade OPC is the most popular general-purpose cement in the country today. The production of 43 grades OPC is nearly 50% of the total production of cement in the country. These days the structural engineers are favouring 43 grade mainly for RCC works where the structure takes high tensile stress. This grade of cement is also used where high early strength is required in 1 to 28 days. Coromandel King 43 grade OPC confirms to IS 4031 and meets the BIS requirements of minimum 28 days compressive strength which should not be less than 43 MPa.