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In this competitive scenario, it isn't easy to survive in the market without a standard quality and certified product. BIS license may also be required to sell products in the Indian market.

To get BIS certification and produce a standard quality product, the manufacturer must ensure that their product must follow the specified Indian standard.
Let's take a closer look at IS 455:2015 for Portland Slag cement.

Portland slag cement is covered under IS 455:2015. The Bureau of Indian Standards adopted this Indian Standard (Fourth Revision) on October 30, 2015, after the Civil Engineering Division Council approved the Cement and Concrete Sectional Committee's final draft. This standard specifies the manufacturing process and the chemical and physical requirements of Portland slag cement.

Portland slag cement shall be made by mixing Portland cement clinker, gypsum, and granulated slag in the appropriate quantities and grinding the mixture to get a thorough and intimate mixing of the constituents. It can also be made by grinding Portland cement clinker, gypsum, and granulated slag separately and then mixing them thoroughly. The resultant product is Cement with physical qualities similar to standard Portland cement. The slag constituent of the Portland slag cement must be not less than 25% and no more than 65 percent.

Portland cement clinker used in the manufacture of Portland slag cement must meet all of the chemical requirements specified in IS 269:2015 for 33 grade ordinary Portland cement. The Portland slag cement must meet the physical requirements in accordance with IS 455:2015.

It has a low heat of hydration and is significantly more resistant to soils and water. It has high levels of sulphates of alkali metals, alumina, and iron, as well as acidic waters, and can thus be used advantageously for marine works.