Cement buying guide: OPC vs PPC vs PSC, and what to check on delivery

Ordinary Portland Cement is pure clinker and gypsum with nothing blended in. The number is the 28-day compressive strength in MPa. OPC 53 gains strength fastest, which matters when you need to strike formwork quickly or you are casting precast elements.

The trade-off is a higher heat of hydration and more shrinkage cracking risk in large pours, and a shorter workable window in hot weather.

Portland Pozzolana Cement blends fly ash into the clinker. It gains strength more slowly but keeps gaining for much longer, ending up denser and less permeable than plain OPC.

For most residential work — foundations, walls, plaster, general RCC — PPC is the sensible default. It is more workable, generates less heat, and resists chemical attack better over the building's life.

Portland Slag Cement blends ground granulated blast furnace slag. Its real advantage is resistance to sulphates and chlorides, which makes it the right call near the coast, in industrial areas and for structures in contact with groundwater.

Check the manufacturing date on every bag. Cement older than three months has lost strength; older than six months should not be accepted for structural work.

Squeeze a handful. Good cement is smooth and cool; gritty texture or hard lumps mean moisture has already got in.

Check bag weight — short weight across a large order is a real cost.

Confirm the grade printed matches what you ordered. Substitution of OPC 43 for 53 is common and rarely mentioned.

Store on wooden planks, away from walls, under cover, no more than ten bags high.

PPC for most residential work, OPC 53 where you need fast strength, PSC in aggressive environments — and always check the manufacturing date.

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