OPC 43 Grade Cement — Chemical

Chemical testing includes insoluble residue, loss on ignition, magnesia, total sulphur, chloride and relevant chemical ratios. These tests help verify whether OPC 43 meets the applicable BIS requirements.

Yes. Amendment No. 1 to IS 269:2015 was issued in 2023, with implementation required by 17 February 2024. Changes included a new performance improver, revised provisions for sulphur and other requirements applicable to sleeper grades.

Yes. Current BIS laboratory information continues to list IS 269:2015 for OPC 43 and other covered grades, including chemical and physical testing parameters.

Chemical testing verifies important composition-related characteristics and helps ensure the cement conforms to BIS specifications. Testing can support quality control, certification requirements and product conformity for manufacturers and suppliers.

Testing helps confirm that the cement meets applicable BIS chemical and physical requirements, supporting consistent product quality, regulatory conformity and reliable performance in construction applications.

Several requirements under IS 269 refer to associated Indian Standards, such as IS 4031 for physical tests and IS 4032 for chemical analysis. BIS laboratory scopes specifically identify these methods for parameters such as setting time, compressive strength and chemical composition.

Yes. IS 269:2015 consolidated the requirements previously covered separately for OPC 33, OPC 43 and OPC 53 into one standard, while also including the sleeper grades OPC 43S and OPC 53S.

BIS issued Amendment No. 1 in 2023, with implementation required from 17 February 2024. The amendment introduced ground granulated blast furnace slag as a performance improver, removed certain jute-bag provisions and revised the SO₃ limit for OPC 43S.