IS 269:1989 is the Indian Standard (BIS) for ordinary portland cement, 33 grade - specification. This standard covers the manufacturing, chemical, and physical requirements for 33 Grade Ordinary Portland Cement (OPC). While 33 grade cement is largely obsolete in modern construction, this code was historically essential for quality control to verify properties like setting time, soundness, and compressive strength.
Specifies requirements for 33 grade ordinary portland cement; commonly referenced for older projects.
Key reference values — verify against the current code edition / project specification.
| Reference | Value | Clause |
|---|---|---|
| Status | Earlier OPC 33 edition — cite IS 269:2015 for new work | Critical |
| Grade def | 28-day standard-mortar strength ≥ 33 MPa | Scope |
| Reality | OPC 33 largely superseded by 43/53/PPC | Concept |
| Lower-strength need | Prefer PPC / blended cement today | Application |
| Use 1989 for | Legacy records / old-structure assessment only | Rule |
| Note | Cement grade ≠ concrete grade | Caution |
| Durability | Cover + W/C + curing (not the grade) | Rule |
IS 269:1989 is an earlier specification for 33-grade Ordinary Portland Cement — a predecessor edition of IS 269 (which now also frames the OPC physical-test requirements). It is referenced for older projects and legacy documentation; for new work the current IS 269:2015 edition is the standard, and OPC 33 itself is now largely superseded in practice by 43- and 53-grade.
It sits in the OPC family:
33-grade OPC has a 28-day standard-mortar strength ≥ 33 MPa (IS 4031 on IS 650 sand) — the lowest of the three OPC grades:
The engineering point: the durable lesson is the same across editions and grades — match cement to the governing requirement, durability comes from cover + W/C + curing not from chasing grade, and cement grade ≠ concrete grade. For new specifications, cite the current IS 269:2015 and select among 43/53/PPC by requirement rather than reaching for an outdated 33-grade reference.
Scenario A — assessing an older structure whose records cite IS 269:1989 / OPC 33: interpret the cement as 33-grade OPC to the then-current requirements; use the behavioural essentials for the condition assessment, noting strengths/heat differ from modern 43/53.
Scenario B — new construction: do not specify OPC 33 to the 1989 edition. Specify the current IS 269:2015 and select OPC 43/OPC 53/PPC by the governing requirement (strength/heat/durability).
Step — apply selection logic: ordinary work → OPC 43/PPC; early strength/high grade → OPC 53; durability/heat → PPC/slag/low-heat.
Always: cement grade ≠ concrete grade; durability = cover + W/C + curing.
The 1989 edition is a *legacy reference*; the live engineering decision uses the current code and modern grades.
1. Specifying the 1989 edition / OPC 33 for new work. Cite the current IS 269:2015 and select a modern grade by requirement.
2. Assuming market availability of plain 33-grade. It is largely superseded — modern cement typically meets 43/53.
3. Confusing cement grade with concrete grade. OPC 33 ≠ M33 concrete; the 33 is mortar strength feeding IS 10262.
4. Chasing grade instead of fitness. Durability is cover + W/C + curing; pick the cement for the governing requirement.
5. Misreading legacy records. When assessing old structures, interpret IS 269:1989/OPC 33 to its then-current requirements, not modern grade expectations.
IS 269:1989 is a legacy OPC 33 specification, and its honest present-day role is narrow: reading older mix designs and condition-assessing structures specified to it. Plain 33-grade is largely superseded — modern clinker and grinding routinely deliver 43-/53-grade, and where lower strength/heat is wanted PPC/blended cements are preferred. For any new work the discipline is to cite the current IS 269:2015 and choose among OPC 43/OPC 53/PPC by the governing requirement. The edition-independent fundamentals never change: cement grade ≠ concrete grade, durability is cover + W/C + curing, and selection is fitness for purpose — chasing or citing an outdated grade reference is the only real mistake this legacy edition invites.