Cement is an essential construction material that is most extensively used in construction. Cement is available in various grades. The strength of the concrete is dependent on the grade of the cement. Generally, there are three grades of cement available in the market, available in 33 grade, 43 grade and 53 grade.

1.  33-grade cement means that the compressive strength of the cement after 28 days is 33N/mm2 when tested as per Indian Standards under standard conditions.
   This grade of cement is used for general construction work under normal environmental conditions, usually for Plastering, Flooring, and masonry. It may not be suitable for the concrete grade above M20.
2.  43-grade cement means that the compressive strength of the cement after 28 days is 43N/mm2 when tested as per Indian Standards under standard conditions.
   This grade of cement is used for plain concrete work and plastering works. It can be used where setting time is not a necessary criterion. Grade 43 cement has a low initial strength but gains good strength over a period of time.
3.  53-grade cement means that the compressive strength of the cement after 28 days is 53 N/mm2 when tested as per Indian Standards under standard conditions. Widely used general-purpose cement & has a faster setting time when compared to 43-grade cement. It is mostly used for structural purposes as in reinforced cement concrete