What does '43 Grade' signify?

It signifies that the minimum compressive strength of the cement after 28 days of curing shall not be less than 43 MPa or 430 kg/cm² (as per Table 2).

What are the required setting times for this cement?

The initial setting time must be a minimum of 30 minutes, and the final setting time must be a maximum of 600 minutes (10 hours), as per Table 2.

How should cement bags be stored on site?

Cement should be stored in a dry, leak-proof shed, on raised platforms (like wooden pallets), at least 300mm from the floor and walls, and stacked to a height of no more than 10 bags to prevent lumping (Clause 8).

What is the soundness requirement for 43 grade cement?

The expansion, when tested by the Le Chatelier method, must not exceed 10 mm (as per Table 2).

IS 8112

: 1989

Ordinary Portland Cement, 43 Grade - Specification

SupersededFrequently UsedSpecificationMaterials Science · Cement

Superseded by IS 269:2015

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This standard lays down the manufacturing, chemical, and physical requirements for 43 Grade Ordinary Portland Cement (OPC). It is a general-purpose cement whose 28-day compressive strength is specified to be a minimum of 43 MPa. The code provides mandatory requirements for properties like setting time, soundness, and fineness, along with guidelines for storage and marking.

Specifies requirements for 43 grade ordinary portland cement; commonly referenced for older projects.

Quick Reference Values

Minimum Compressive Strength (3 days)23 MPa

Minimum Compressive Strength (7 days)33 MPa

Minimum Compressive Strength (28 days)43 MPa

Minimum Initial Setting Time30 minutes

Maximum Final Setting Time600 minutes

Minimum Specific Surface (Fineness)225 m²/kg

Maximum Magnesia (MgO) content6.0 percent by mass

Practical Notes

Although replaced by IS 8112:2013, the 1989 version's principles are foundational and many existing structures were built using it. Always use the latest version for new projects.

43 Grade OPC is a versatile, all-purpose cement ideal for plastering, non-structural and structural concrete, and masonry. For higher early strength needs, consider 53 Grade OPC.

Always check the 'Week of Manufacture' printed on the bag. Cement older than 3 months may show strength loss and should be re-tested before use.