Short answer
How can I check cement quality on site? You cannot prove cement quality on site. Check the bag: the Standard Mark, the licence number, the packing date and the bag's condition. You can look up the licence number in the BIS Care app. Hard lumps are a warning sign of moisture. Quality needs a laboratory test under the Indian Standard methods, which your engineer can arrange.
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Cement is sold in bags, and the bag is the only thing most house owners see before the cement goes into the mix. It is natural to want to test it. This guide explains what a site check can show, what the bag should carry, how to use the licence number, and why the real quality test happens in a laboratory. It names no brands and gives no strength figures.
What can a site check tell me?
Very little. A site check can show some warning signs: damp, hard lumps, torn or old bags. It cannot show the grade, the fineness, the soundness or the setting time of the cement. Those need a laboratory test under the Indian methods for cement (IS 4031, in several parts). The standard methods for fineness, soundness and setting time are all laboratory procedures, using sieves, moist cabinets and specialised apparatus. None of them is a site check.
So the site check is a filter, not a test. It tells you when to stop and ask. It does not tell you the cement is good.
What should the bag show?
BIS guidance for IS 269:2015, the standard for ordinary Portland cement, says that “The ISI Mark and the following details shall be applied on each bag or package in BLACK COLOUR” (clause 5.1). Some of the details the guidance lists are below. The guidance also lists the name and designation of the cement, the manufacturer’s address, and any performance improver added, so check the full list against your bag.
| On the bag | What to look for |
|---|---|
| Manufacturer’s name and trade mark | A name you can find and contact |
| Net quantity | The weight in kilograms |
| “Use no Hooks” | The words are printed on the bag |
| Batch or control unit number | The week, month and year of packing |
| Best-before date | 3 months or 12 weeks from the packing date |
| Test note | A note such as “Cement to be tested before use if more than 3 months old from date of packing” (the wording varies by maker) |
| Licence number | The CM/L number of the licence holder |
These are the marking details that BIS’s 2016 guidance sets out for IS 269:2015. The full text of the standard was not read for this guide, so ask your dealer to show you each item on the bag you are buying.
What does the licence number tell me?
The Standard Mark shows that the product is under a BIS licence scheme. The BIS Standard Mark page says the licence number should be shown “suitably on the product along with the BIS Standard Mark preferably below the Standard Mark as ‘CM/L-XXXXXXXXXX’.”
BIS’s own blog for its BIS Care app says that you can “Fetch details of licensee based on CM/L No.” by entering the licence number and pressing “Go.” This tells you who holds the licence. It does not test the bag in your hand. Check the licence number on the bag against the app, and keep the packing date and the batch number with your records.
What can I check by hand?
This section is practice. None of these checks is a standard test.
- Bag condition. Look for bags that are torn, wet or damp, or that have been stored on bare ground.
- Packing date. The bag’s own test note asks for a test before use if the cement is more than 3 months old from the packing date. The 3 months runs from the packing date, not the day you buy.
- Hard lumps. Open a bag on a flat surface. Hard lumps usually mean the cement has taken in moisture. Soft lumps that crumble are less of a warning. A hand check cannot show the grade, the fineness or the strength.
- Storage. Ask how the bags were stored. The cement should be dry and covered, not on the floor.
Some home tests that circulate online, such as the float test and the temperature test, are not standard tests. The sources disagree about what they mean, so do not rely on them.
When do I need a lab test?
This section is practice. Ask your engineer to arrange a laboratory test on the batch when the cement is important for the work, when a bag is older than the bag’s own test note allows, or when the bags look damp. The lab tests for fineness, soundness and setting time are the methods in IS 4031. A dealer or supplier can often give you the manufacturer’s test certificate for the batch, which you can ask for in writing.
What mistakes should I avoid?
This section is practice.
- Trusting the ISI or Standard Mark on a fresh bag as proof that the cement in it is good.
- Using bags with hard lumps in structural work.
- Storing bags on the floor or against a wet wall.
- Relying on the float test or the temperature test as a pass or fail.
- Using bags older than 3 months without a test, when the bag’s own note asks for one.
- Typing a licence number into any random website. Use the BIS Care app or the BIS website.
Frequently asked questions
Can I test cement at home?
You can make rough checks, such as the bag condition and the hard lumps. Those do not measure quality. For quality, the tests are laboratory tests under IS 4031.
Is the ISI mark enough?
The mark shows that the product is under a BIS licence scheme. Check the licence number, the packing date and the batch, and keep the records. The mark does not replace a test when the work needs one.
Is the float test valid for cement?
No standard test uses it, and the sources online disagree on what it means. Do not use it to decide whether cement is good.
Related guides
This guide is general information. Read the disclaimer. Your engineer decides which cement and which tests are right for your work.
Sources
- BIS, Central Marks Department, Implementation Guidelines for IS 269:2015, document STI/269/7 (August 2016), clauses 5 and 5.1. A BIS licensing guideline, not the standard's text. Quotes checked against the document.
- IS 269:2015, Ordinary Portland cement: specification. Current per the BIS record (valid to 2030-12-31). Full text not read for this guide.
- BIS, Standard Mark page (last updated November 2025): licence number shown with the Standard Mark.
- BIS, BIS Care app blog post (18 November 2021): checking a licence by its CM/L number.
- IS 4031 (Part 1):1996, Part 3:1988 and Part 5:1988, methods of physical tests for hydraulic cement: scope clauses read. Laboratory test methods, not site checks.
General information only. It is not a structural design or professional advice. Ask a licensed structural engineer or architect to check your plans and site.