MR plywood, for the dry rooms
MR stands for Moisture Resistant. It is bonded with a melamine-urea-formaldehyde resin and made to IS:303, and it is the correct — and most economical — choice for every dry room in a house. It resists humidity and steam. It is not designed for standing water, and it is often mis-sold as though it were.
What MR grade actually means
MR resists moisture in the air. It does not resist water as a liquid. The phrase "semi-waterproof" gets used for MR grade and describes nothing real: MR handles a different type of exposure, not a smaller quantity of the same one. Used in the room it was designed for, it is a long-life material.
Where to use it
- Bedroom wardrobes, beds and side tables
- Living-room TV units and display shelving
- Wall panelling on a batten framework
- Study, storage and loft units
- Office workstations and desking
Where it is the wrong choice
- Kitchens
- A kitchen delivers repeated small wettings. That is what a phenolic bond is for — use BWR.
- Bathrooms and utility areas
- Use BWR outside splash range and BWP within it.
- Balconies and anything semi-exposed
- Use BWP.
Specification
| Grade | MR Plywood (MR) |
|---|---|
| Indian Standard | IS:303 |
| Bond | Melamine-Urea-Formaldehyde |
| Thicknesses | 4 mm · 6 mm · 9 mm · 12 mm · 16 mm · 19 mm · 25 mm |
| Sheet sizes | 8 × 4 ft (2440 × 1220 mm) · 7 × 4 ft (2135 × 1220 mm) · 6 × 4 ft (1830 × 1220 mm) |
| Custom sizing | Panels cut to your cutting list for bulk orders |
19 mm for carcasses, shutters and shelves; 12 mm for back panels and drawer bottoms. Shelves spanning over three feet need 25 mm or a mid-support.
How this board is made
The resin changes with the grade. Nothing else does — every board runs the same seventeen consecutive stations at our line in Hassan, Karnataka, and these four apply to MR grade exactly as they do to every other:
- Composed core
- Core veneers jointed edge-to-edge into full-size sheets before assembly, so the finished board has no internal voids.
- Calibrated thickness
- Both faces ground after pressing so the whole sheet is one uniform thickness — a different operation from sanding.
- ACC preservative treatment
- Dipped in an acid copper chromate bath as a station on the line, so the treatment penetrates rather than coating the surface.
- Laboratory tested
- Samples from every batch tested against IS:303 and IS:710 — moisture content, glue shear strength and water resistance — before dispatch.
Architects and bulk buyers are welcome to walk the line and take a board away to cut open before ordering.
Choosing between the grades
Grade is a water rating, not a quality ranking. The most common and most expensive error is buying up when the room does not need it.
Guides worth reading first
Questions we get asked
Is MR plywood waterproof?
No. It resists humidity and steam, not standing or repeated liquid water. Use a phenolic-bonded grade where water is present.
Is MR plywood good quality?
Grade and quality are separate things. A well-made MR board with a composed core and calibrated thickness, used in a dry room, is the correct specification.
Can MR plywood be used in a kitchen?
Not for the working run, carcasses or shutters. Use BWR, with BWP under the sink.
Tell us the room, the thickness and the quantity and we will quote against it — including when a cheaper grade is the right answer.