This standard outlines the production process, as well as the chemical and physical prerequisites, of 33-grade Ordinary Portland Cement. Ordinary Portland Cement is a hydraulic binder created by blending Portland cement clinker, composite material, and gypsum in appropriate proportions. It possesses superior binding characteristics, enhancing the strength of structural elements.

Ordinary Portland cement is produced by meticulously blending calcareous and argillaceous materials, along with other substances containing silica, alumina, or iron oxide. This mixture is then subjected to clinkering temperatures, followed by grinding the resulting clinker to manufacture cement that complies with this specification.

Ordinary Portland cement is obligated to satisfy the physical and chemical criteria delineated in the standard. Manufacturers are responsible for ensuring that the cement adheres to these standard requirements.

TESTS

The specified tests must be conducted for Ordinary Portland cement.

• Insoluble Residue

• Loss of ignition

• Fineness

• Setting

• Soundness

• Compressive strength

• Transverse strength test

A properly maintained laboratory is essential for conducting various tests according to the methods outlined in the standard.

The cement must be packaged in bags according to the standard specifications. Each bag should bear clear and permanent markings as outlined in the standard. Additionally, the Standard Mark (ISI Mark) may be affixed to the cement. Manufacturers are required to obtain a BIS license from the Bureau of Indian Standards to use the standard mark (ISI Mark). This license is granted following a successful evaluation of manufacturing infrastructure, quality control and testing capabilities, and production processes.

PROCESS FOR BIS ISI MARK CERTIFICATION

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