OPC 42.5N

Our OPC 42.5N is an Ordinary Portland Cement with attributes of high early & late strengths even though it is classed as 42.5N. Its early strength (2 days) reaches up to 25 MPa, whereas its late strength (28 days) reaches up to 53.5 MPa. 

It conforms to CEM I with strength class 42.5N in accordance with Ethiopian Standard ES 1177-1:2005 as adapted from EN 197:1:2000 Cement Part 1: composition, specifications & conformity criteria for common cements.

It comprises 95% clinker & 5% gypsum. 


  • Suitable for wide range applications where high early & late strengths and quick setting are importation considerations.
  • Typical applications include use in general ready-mixed and site-mixed concrete, precast and prestressed concrete, masonry, mortars, renders and grouts
  • High strength structures like high rise buildings & structures, bridges, concrete pipes, columns, slabs, beams, suspended slabs, precast manufacturing, silos, slip forming, foundations, block making, water retaining structures, etc.


When using cement in construction, there is no substitute for good practice and workmanship. It is always very critical to use the correct materials and measure, and mix the materials properly, add the correct amount of water and compact, cure and protect the concrete as appropriate.

Concrete and mortar strength is significantly affected by mix constituents and proportions, ambient temperature and curing conditions. A durable concrete requires adequate cement & a low water:cement ratio.

The cement content must be correct for the application and the water:cement ratio as low as possible consistent with satisfactory placing, thorough compaction and effective curing. Hence

  • Accurately measure all materials
  • Mix thoroughly
  • Add water whilst mixing but avoid adding too much water. The more water, the weaker the concrete will be. It is critical to use the minimum amount of water required to make the mix workable.

Our OPC 42.5N is available in bulk, 50kg bags, 1.0, 1.5 & 2.0 jumbo bags.