“Ordinary Portland Cement (OPC):

Grade OPC 53

Produced by grinding clinker with gypsum as per BIS specification IS: 269-2015.
Also known by the name ‘grey cement’.
Used to produce pre-stressed & precast concrete with high strength.
Meets BIS requirements of minimum 28 days compressive strength which should not be less than 53 MPa (IS : 269 – 2015).”