BIS MARK COMPULSORY SINCE 2025
How to Check Plywood Quality Before You Buy
Tapping the board and boiling an offcut tell you almost nothing, and a counterfeit board passes both. The check that works takes two minutes: read the markings, confirm the BIS licence number is in the right format, and verify it in the BIS Care app.
HOME | CHECK PLYWOOD QUALITY
Checking plywood quality is not a matter of tapping the board or boiling an offcut. Those tests respond to how dense a board is and what glue it smells of, and a counterfeit board passes all of them. The check that works is the licence. Read the markings printed on the board, confirm the BIS licence number is in the correct format, which is CM/L followed by ten digits, verify it in the BIS Care app under Verify Licence Details, and confirm the standard and grade printed alongside it are the ones you are paying for. Since 28 August 2025 the BIS Standard Mark is compulsory on plywood in India for manufacturers of every size, so a board without one is not a budget option, it is non compliant.
Start With the Markings, Not the Tests
Every board made under a BIS licence has to carry its identification printed on it. That printing is the only part of a plywood sheet that can be checked against an external record, which makes it the only part worth starting with.
Six things should be there. The name or recognised trade mark of the manufacturer. The Indian Standard number, with its edition year. The grade and type. The BIS Standard Mark with its licence number. The batch or lot identification. And the year of manufacture. On most boards this is printed along one long edge or stamped on the back face.
Read them in that order and most problems surface before you have touched the board. A missing licence number, a grade that does not match the standard, or an IS number with no edition year are all reasons to ask a question rather than to pay.
| Marking | What it should look like | What a problem looks like |
|---|---|---|
| Manufacturer | A name or registered trade mark | A generic description with no identifiable maker, or a brand name with no legal entity anywhere on the board |
| Indian Standard number | IS 303, IS 710, IS 5509, IS 1659 or IS 2202, with the edition year | An IS number with no year, or an edition that has since been superseded. IS 303 and IS 710 were both revised in 2024 and IS 5509 in 2021 |
| Grade and type | MR, BWR, BWP, or marine under IS 710 | Waterproof, 100 percent waterproof or water resistant. None of those is a grade and none appears in any standard |
| BIS Standard Mark and licence | The mark with a licence number reading CM/L followed by ten digits | A mark with no number beside it, or a number in any other shape. The mark alone can be printed by anyone |
| Batch or lot | A batch, lot or production code | Nothing. Without it a test report cannot be tied to the board in front of you |
| Year of manufacture | A year, sometimes with a month | Nothing, or a year that predates the edition of the standard printed next to it |
The BIS product manual for plywood also requires the marking to carry the instruction to visit the BIS website for certification details. A board with a Standard Mark and no such line is worth questioning.
How to Verify the BIS Licence Number
This is the step the rest of the category leaves out, and it takes about two minutes.
A BIS licence for plywood is issued as CM/L followed by ten digits. Licences issued when the format was seven digits are now shown padded with leading zeros to ten. If the number on the board is not in that shape, you do not need to verify anything further. Something is wrong with the printing, and printing is the part a counterfeiter controls.
- Read the number off the board. Not off the invoice, not off a brochure, not off a sticker on the shrink wrap. Off the board itself, next to the Standard Mark.
- Check the shape before you check the number. CM/L and ten digits. A number with too few digits, extra characters or a different prefix is a reason to stop.
- Open the BIS Care app and choose Verify Licence Details. The app is published by the Bureau of Indian Standards. Enter the licence number exactly as printed.
- Read what comes back against what is printed on the board. The licence holder name should match the manufacturer. The standard should match the IS number on the board. The scope should cover the grade you are buying. A licence that is live but covers a different standard or a different grade does not cover the board in your hand.
- If it does not resolve, ask the dealer before you conclude anything. Typing errors are common and licence records are occasionally slow to update. Show the dealer the result and ask for the manufacturer to confirm the number. A dealer who cannot get that confirmation has told you something.
A brand verification app is a different check, and both are worth doing. Scanning a code into a brand own app confirms the board is recorded in that brand database, which is a real check against a counterfeit of that brand. It does not confirm that the BIS licence is live, which standard it covers, or which grade it was issued for. Only the BIS record answers those. Any page that offers you a brand app as licence verification has conflated the two.
The BIS Mark Is Now Compulsory, Not a Mark of Distinction
Almost every guide to buying plywood in India still describes the BIS mark as a sign that a brand takes quality seriously. That framing is out of date.
The Plywood and Wooden Flush Door Shutters (Quality Control) Order 2024, notified as S.O. 1377(E) on 15 March 2024, requires goods covered by the listed Indian Standards to carry the BIS Standard Mark under a valid licence. Enforcement ran in three tiers: 28 February 2025 for general manufacturers, 28 May 2025 for small enterprises and 28 August 2025 for micro enterprises. All three dates have passed, so the mark is now compulsory rather than optional, and the only exemption is goods made in India for export.
Two things follow for a buyer. An unmarked board is not a legitimate lower specification option, it is a non compliant one, and the liability for selling it sits with the seller. And any guide that still presents the mark as optional was written before the enforcement dates and has not been updated since, which is a reasonable signal about the rest of its advice.
| Manufacturer category | Mark compulsory from | Status now |
|---|---|---|
| General, all other manufacturers | 28 February 2025 | In force |
| Small enterprises | 28 May 2025 | In force |
| Micro enterprises | 28 August 2025 | In force |
The only exemption in the order is goods manufactured in India for export. The order covers plywood under IS 303, marine plywood under IS 710, fire retardant plywood under IS 5509, decorative veneered plywood, block boards under IS 1659 and flush door shutters under IS 2202 and IS 2191, among others.
The Four Tests Everyone Teaches, and What Each One Actually Proves
These tests are not useless. They are a screen for obvious defects, and used that way they are worth two minutes at a counter. They are presented across this category as a way to detect a fake or confirm a grade, and they cannot do either.
| Test | What it responds to | What it cannot tell you |
|---|---|---|
| Tap and listen | Density, core gaps and voids. A hollow patch really does sound different | Bonding grade. A dense board glued with a low grade urea formaldehyde line sounds exactly like a BWP board |
| Drive a nail | Whether the board splits at the edge, and roughly how the core holds | Nothing standardised. No Indian Standard for plywood specifies a screw or nail holding figure, so there is no number to compare your result against |
| Bend a corner | Stiffness, which tracks density and thickness | Bonding grade and moisture resistance. Stiffness and glue quality are separate properties |
| Boil an offcut | Gross delamination, which is a real defect worth finding | Whether the board meets IS 710 or IS 303 BWP. The standard requires a specified boiling cycle in laboratory apparatus followed by measured glue shear strength against minimum values. A pan on a stove measures none of that |
Use all four as a screen. If a board fails any of them, reject it. If it passes all four, you have learned that it is not grossly defective, which is not the same as learning that it is what the stamp says it is.
Checks That Are Worth Doing at the Counter
Five things you can actually assess by looking, and all five are about defects the standards define rather than about grade.
- Look along the edge for core gaps. Hold the sheet at eye level and sight down the glue lines. Gaps, overlaps and visible voids in the core veneers are defects, and they are the most common real quality problem in this market.
- Check the sheet is flat. Stand it on edge against a wall. A bow or a twist usually means the board was dried or stored badly, and it will not flatten out once it is cut.
- Count the plies and see that they alternate. Grain direction should alternate layer to layer. Two adjacent veneers running the same way is a construction fault.
- Feel the face for sanding and patching. Run a hand across it. Heavy patching, overlapping repairs or a face that has been sanded thin to hide them all belong on a lower grade than the one being charged for.
- Weigh a sheet if you can. Not against a standard figure, because no Indian Standard for plywood specifies a density, but against another sheet of the same grade and thickness in the same yard. A large difference between two sheets sold as the same thing is a question.
On the density point specifically. Several guides publish density ranges in kilograms per cubic metre as if they were specification limits. No Indian Standard for plywood or block board specifies a density requirement. Those figures are typical values for particular species, not pass or fail thresholds, and a board cannot be rejected on density alone.
What to Ask For in Writing
For a single sheet, the markings and the licence check are enough. For a project quantity, ask for paper, and ask for it before the order rather than after a problem.
- The BIS licence number, with the standard and grade it covers. So you can verify it yourself rather than taking the scope on trust.
- A test report tied to the batch you are buying. A report with no batch reference cannot be connected to the boards that arrive. Ask for the batch identification to appear on both the report and the boards.
- The laboratory that issued it. A report from the manufacturer own quality department is a useful document and it is not third party verification. Both exist and they are not the same thing.
- The IS number with its edition year. IS 303:2024, IS 710:2024, IS 5509:2021. An undated IS reference in a quotation is worth clarifying.
- Which grade, in the language of the standard. MR, BWR, BWP, or marine under IS 710. If the answer comes back as waterproof or water resistant, ask again.
How to Read a Plywood Test Report
A test report is a list of properties with a measured value and the minimum the standard requires. Four things are worth knowing before you read one.
Averages and minimums are different rows. The standards set both an average across the samples and a minimum for any individual sample, and a board can pass on average while one sample failed. If only an average is reported, the minimum is the figure that is missing.
Along and across the grain are different results. Bending strength is measured in both directions and the figures are not interchangeable. A report that gives one number without saying which direction it refers to is incomplete.
Dry and wet are different tests. Glue adhesion is measured in both states, and the wet figure is the one that describes what happens to the board in service.
Rows that should be blank. A mycological test appears only on MR grade. A preservative retention figure appears on treated and marine boards. A row filled in where the standard does not call for it is as much of a signal as a row left blank where it should be filled.
There is a longer version of this. The specification guide on this site walks through every number on a plywood test report, including how to decode the tensile adhesion figures and which rows should be empty for which grade.
If a Board Is Not What It Was Sold As
Three routes, in the order worth trying.
Start with the dealer and the manufacturer, with the batch number and photographs of the markings. Most genuine problems are resolved here, because a manufacturer with a live licence has a strong reason to resolve them.
If the board carries a BIS Standard Mark and does not meet the standard it claims, that is a matter for the Bureau of Indian Standards. BIS accepts complaints about misuse of the Standard Mark, and the licence number, the batch and photographs of the marking are what a complaint needs.
If the board carries no mark at all and was sold after the enforcement dates, the sale itself is non compliant under the 2024 order, and the consumer protection route applies alongside the BIS one. Keep the invoice, which has to describe what was sold.
Photograph the markings before the board is cut. Once sheets are cut and installed, the printed edge is usually gone, and with it the licence number, the batch and the year. A photograph of the marking on each delivered sheet takes a minute and is the only evidence that survives the carpenter. This is the single most practical instruction on this page and no competitor gives it.
Why Buyers Check Advance Ply Boards and Find What They Expect
- The markings are complete. Manufacturer, IS number with edition, grade, Standard Mark with licence number, batch and year. Verify any of them.
- The grade on the board matches the standard on the board. A board marked IS 710 is a marine board. A BWP board is marked IS 303 with its grade. This site does not use waterproof or 100 percent waterproof as if they were grades, because they are not.
- Published specifications rather than claims. Every board range on this site publishes the properties the standard requires, with the average and the minimum, measured along and across the grain.
- Made since 1991. Advance Ply is the brand of Amba Panel India Private Limited, manufacturing wood panels and supplying through a dealer network across India.
Browse the plywood range, the marine plywood and fire retardant plywood hubs, or contact the technical team with a board you want checked.
Frequently Asked Questions About Checking Plywood Quality
How do I check plywood quality before buying?
Read the markings printed on the board, then verify them. The board should carry the manufacturer name, the Indian Standard number with its edition year, the grade, the BIS Standard Mark with a licence number, a batch identification and the year of manufacture. Check the licence number is in the correct format, which is CM/L followed by ten digits, and verify it in the BIS Care app under Verify Licence Details. Then sight along the edge for core gaps and check the sheet is flat.
What is the format of a BIS licence number for plywood?
CM/L followed by ten digits. Licences originally issued as seven digits are now shown padded with leading zeros to ten. A number in any other shape is a reason to stop and ask, because the printing on a board is the part a counterfeiter controls.
How do I verify an ISI or BIS mark on plywood?
The mark itself cannot be verified, because it can be printed by anyone. The licence number beside it can. Open the BIS Care app published by the Bureau of Indian Standards, choose Verify Licence Details and enter the number exactly as printed on the board. Check that the licence holder name matches the manufacturer, the standard matches the IS number on the board, and the scope covers the grade you are buying.
Is the BIS mark compulsory on plywood in India?
Yes. The Plywood and Wooden Flush Door Shutters Quality Control Order 2024 made the BIS Standard Mark compulsory, with enforcement from 28 February 2025 for general manufacturers, 28 May 2025 for small enterprises and 28 August 2025 for micro enterprises. All three dates have passed. The only exemption is goods manufactured in India for export. A board sold without the mark is non compliant, not simply a lesser option.
Does the tap test tell me if plywood is good quality?
It tells you whether there are gaps or voids in the core, which is worth knowing. It cannot tell you the bonding grade. A dense board glued with a low grade adhesive sounds the same as a BWP board, because the sound responds to density and voids rather than to the glue. Use it as a screen for obvious defects, not as a grade test.
Can I test plywood by boiling it at home?
A home boil finds gross delamination, which is a real defect. It is not the IS 710 test and cannot substitute for it. The standard requires a specified boiling cycle in laboratory apparatus followed by measured glue shear strength against minimum values. Boiling an offcut in a pan tells you a board is badly made. It cannot tell you whether a board meets IS 710 or IS 303 BWP.
How can I identify fake plywood?
Not by any test you can do at a counter, because a counterfeit board with a printed stamp passes the tap, bend and smell tests. Check the licence number instead. Confirm it is in the CM/L plus ten digit format, verify it in the BIS Care app, and check the standard and grade it covers match what is printed on the board. A mark with no number beside it, or a number in the wrong shape, is the clearest signal available.
What does the nail test on plywood prove?
Very little that can be compared to anything. It shows whether the board splits at the edge. No Indian Standard for plywood specifies a nail or screw holding figure, so there is no published number to measure your result against. Treat it as a rough check for brittleness at the edge.
Is a brand verification app the same as checking the BIS licence?
No. A brand app confirms the board is recorded in that brand own database, which does catch a counterfeit of that brand. It cannot confirm that the BIS licence is live, which standard it covers or which grade it was issued for. Both checks are worth doing and they answer different questions.
What markings should be printed on a plywood board?
The manufacturer name or registered trade mark, the Indian Standard number with its edition year, the grade and type, the BIS Standard Mark with its licence number, a batch or lot identification and the year of manufacture. The BIS product manual also requires a line directing the buyer to the BIS website for certification details.
Why does the edition year of the IS number matter?
Because it tells you which version of the specification the board was made to. IS 303 and IS 710 were both revised in 2024 and IS 5509 in 2021. A board marked with an earlier edition was made to a superseded specification. Stock moves slowly so this is not automatically a defect, but it is a fair question to ask.
Is waterproof plywood a grade?
No. The grades in the Indian Standards are MR, BWR and BWP under IS 303, and marine under IS 710. Waterproof, 100 percent waterproof and water resistant appear in no standard. If a board is described that way, ask which Indian Standard it is made to and which grade, and expect the answer in that form.
What should I ask for when buying plywood for a whole project?
The BIS licence number with the standard and grade it covers, a test report tied to the batch you are buying, the name of the laboratory that issued the report, the IS number with its edition year, and the grade stated in the language of the standard. Ask before the order rather than after a problem.
What do I do if plywood is not what it was sold as?
Go to the dealer and the manufacturer first, with the batch number and photographs of the markings, because most genuine problems are resolved there. If the board carries a BIS Standard Mark and does not meet the standard it claims, that is misuse of the Standard Mark and BIS accepts complaints about it. If the board carries no mark and was sold after the enforcement dates, the sale itself is non compliant. Photograph the markings on every delivered sheet before anything is cut, because the printed edge disappears once the boards are worked.
Advance Ply
Not Sure About a Board You Have Been Offered?
Send us the markings from the edge and the batch number, and our technical team will tell you what the licence covers and whether the grade matches the application. Which standard, which grade, which licence number.
