Moisture Resistant MDF (MR MDF)

9mm x 2440mm x 1220mm

PLEASE NOTE: Full size sheet materials (2440mm x 1220mm & 1525mm x 1525mm) are only available for local delivery or collection - as these are too large to be dispatched by courier.

Our Moisture Resistant MDF (Medium-Density Fibreboard) is designed for internal, non-structural use in humid conditions, offering improved dimensional stability and durability compared to standard MDF. It is ideal for interior applications where occasional moisture or increased humidity is present.

The product is manufactured and assessed in accordance with EN 13986:2004 + A1:2015 and classified as L-MDF.H, confirming suitability for use in humid internal environments.

Standards & Compliance

• Product classification: L-MDF.H
• Harmonised standard: EN 13986:2004 + A1:2015
• Intended use: Internal, non-structural components in humid conditions
• Thickness range: >9 mm to 45 mm
• System of AVCP: 4
• Formaldehyde emission class: E1
• Pentachlorophenol (PCP) content: ≤ 5 ppm

The product complies with Regulation (EU) No. 305/2011 and is supplied under a valid Declaration of Performance ce31eb45-a3f9-4fa2-87d7-6134a40….

Moisture Resistance & Durability

This MR MDF offers enhanced resistance to moisture-related movement:

• Reduced swelling in thickness, improving performance in humid interiors
• Improved internal bond strength, including after cyclic moisture testing
• Biological use classes: 1 & 2 (internal use)

Typical swelling in thickness ranges from 11% to 16%, depending on board thickness, demonstrating controlled performance in humid environments.

Fire Performance

Reaction to fire performance is classified in accordance with EN 13986, dependent on thickness and installation method:

• Typically achieves D-s2,d0 (excluding flooring) when correctly installed
• Flooring applications achieve Dfl-s1 at applicable thicknesses

Full fire classifications are detailed within the Declaration of Performance.

Recommended Uses

Moisture Resistant MDF is best suited for interior applications where humidity may be present, including:

• Kitchen units and carcasses
• Bathroom furniture and cabinetry (non-direct water exposure)
• Window boards and internal linings
• Built-in furniture
• Shelving and interior joinery
• Utility rooms and washrooms

This product is NOT suitable for external use or for structural applications.

Installation & Finishing Guidance (Important)

• MR MDF is designed for humid internal conditions only
• All exposed edges should be sealed with a suitable primer, paint, lacquer, or edge sealer prior to final installation
• Proper sealing improves durability and helps limit moisture ingress
• Boards should be acclimatised to site conditions before fixing

Correct installation and finishing are essential to achieving long-term performance.