MEDITE MR Moisture Resistant MDF

No. MEDITE MR resists humidity and damp air, not standing water. Thickness swell after 24 hours submerged is under 12% from 9mm up, which is a fraction of what standard MDF does, but the board is not designed to get soaked and should be sealed on every surface before installation.

No. MR MDF is an interior board and is not rated for external use, however well it's painted. For sheltered outdoor work use MEDITE Exterior MDF, and for permanent exposure or ground contact use MEDITE Tricoya Extreme.

Yes. This is what the board is designed for, bathroom vanity units, kitchen carcasses, utility rooms and any interior where humidity is regularly high. Seal, prime and paint every face and edge before it goes in.

The green colour is an identification dye that lets MEDITE MR be told apart from other MDF on site and on the rack. It has no effect on how the board performs and disappears under primer.

Two things. It's made to resist humidity, so it swells and moves far less in damp air, and it's a denser panel, so it machines more cleanly and takes a better finish. Standard MDF in a bathroom or utility room will warp and swell at the edges over time.

We stock MEDITE MR in 6, 9, 12, 15, 18, 22, 25, 30 and 36mm, in both 2440 x 1220mm and 3050 x 1220mm sheets. The 36mm is a composite of two 18mm boards bonded together. We also stock MEDITE Primed MR MDF in 18mm, 2440 x 1220mm. All thicknesses can be bought as full sheets or cut to size.

No. MDF isn't pressed at that thickness, so our 36mm MEDITE MRMDF is made by bonding two 18mm boards face to face. It behaves as a solid section and is used for worktops, heavy shelving and thick door frames. The bond line is visible on a cut edge, so plan for edgebanding or lipping on anything exposed.

Yes. We supply MR MDF as full sheets or cut to size online.

Yes. Seal, prime and paint every surface, including edges and the back, before the panel is installed. This matters most where a board sits against damp plaster. Edges are more porous than faces, so they need particular attention.

Predrill before screwing, to at least 85% of the screw's core diameter. Keep face fixings at least 12mm from the edge and 25mm from a corner, and edge fixings at least 70mm from a corner. Most standard wood glues work on MR.

It achieves D-s2, d0 for reaction to fire under EN 13986 in thicknesses of 9mm and above. It is not a flame retardant board. Where a fire rating is required, specify MEDITE Premier FR, which achieves Euroclass B.

MEDITE MR MDF meets the tighter EU REACH E05 limit that applies from August 2026, confirmed by testing to EN 717-1, and is CARB Phase 2 compliant. That's a lower emission threshold than the standard E1 classification most MDF is held to.