Real vs Fake Plywood: How to Check the ISI Mark, Core and Bill Before You Buy

The quick checklist:

Check	What to look for
ISI mark	Printed, with a CM/L licence number you can verify in the BIS Care app
IS number	IS 303 or IS 710 (or IS 1659 for block board, IS 2202 for doors)
Grade	MR, BWR or BWP clearly printed
Edge	No gaps or overlaps in the core
Surface	Smooth face; the sheet lies flat
Paperwork	GST bill with brand, grade and thickness, plus the warranty card

What's the problem with fake plywood?

Plywood stays in your furniture for many years. The trouble starts when commercial (MR) ply is sold with a BWR or BWP stamp, or a cheap sheet carries a copied brand name. You can't see the difference on day one; after a monsoon or two, the cabinet under the kitchen sink swells, the layers separate and the screws work loose.

The good news: a few simple checks at the shop catch most of it.

1. Check the ISI mark and IS number

A genuine sheet carries the brand, the ISI mark and an IS number on its face:

• IS 303: general purpose plywood: MR and BWR grades, and since a 2024 amendment, an interior BWP grade
• IS 710: marine plywood (always BWP)

Under the ISI mark there's a CM/L licence number. Since 2025, plywood and flush doors sold in India must carry the ISI mark, and you can check the licence yourself in the official BIS Care app (Verify Licence Details): the manufacturer, product and brand should match the sheet. If the stamp is blurred, there's no number, or no grade is printed, stop and ask. The stamp checker and how to read a plywood stamp explain each marking.

For wet areas see BWP and marine plywood; for kitchens and wardrobes, BWR plywood.

2. Look at the edge

The edge shows every layer. Look closely:

• Are there gaps or overlaps between the layers?
• Is the core patched or filled with joined pieces?
• In a full-core sheet every layer is hardwood; in alternate core some layers are lighter wood. Alternate core isn't fake, just a cheaper option, but the seller should say so clearly.

A core with gaps doesn't hold screws and bends in the middle.

3. Weight and surface

• Lift two sheets of the same size and thickness: a much lighter sheet often has a weak core. Weight isn't proof on its own (pine plywood is light by nature), but between two sheets sold as the same product, a big difference is a warning.
• The face veneer should be even and smooth, without large patches.
• Lay the sheet flat: a wavy or twisted sheet will never make a straight shutter.

4. A small boil test (for BWR and BWP)

For a large order, ask for a small offcut and boil it in water for a few hours at home. Good BWR and BWP plywood shouldn't separate. MR (commercial) ply can fail this test, and that's normal, because it's made for dry rooms. The waterproof plywood guide explains the test.

5. Always take the warranty card and GST bill

• Branded plywood often comes with a long warranty, valid only with a GST bill.
• The bill should state the brand, grade, thickness and quantity.
• Many brands print a QR code or hologram on the sheet. Scan it, but don't rely on it alone: a code can be copied. Check that it opens the brand's own page and that the details match, and verify the CM/L number too.

Laminate will cover the stamp, so photograph it before the carpenter starts. Read warranty after laminate.

6. Too cheap is a warning

If one shop sells a brand's BWP sheet far below everyone else, either the grade is different or the sheet isn't genuine. When comparing rates, compare the same brand, grade and thickness. The sq ft to sheet converter helps.

FAQ

Does density (weight) tell me the plywood is good? It helps when comparing two sheets sold as the same product, but it isn't proof. Read the stamp, check the edge and take a bill.

Can the QR code on plywood be copied? Yes, which is why it shouldn't be your only check. Verify the CM/L licence number in the BIS Care app as well.

Buying at Nitin Plywood House, Alipur

We've sold plywood in Alipur since 2000. At the shop you can check the edge, stamp and grade of any sheet yourself, and every order comes with a GST bill. See all products or compare Gurjan plywood and block board. Call or WhatsApp +91-9212017608, tell us the job, and we'll suggest the right grade and thickness.