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Fire-retardant and moisture-resistant construction board for structural applications
  • Description
  • Applications
  • Technical specifications
  • Stock range
  • Characteristics

HydroFlam is an MUF-glued, fire-retardant chipboard that is extremely well suited to structural applications in damp spaces. The board only displays minimal expansion and swelling under the influence of high relative humidity.
HydroFlam has powerful fire-retardant characteristics (European classification B-s2, d0). Fires in the board go out by themselves and do not continue to glow after the source of heat has been taken away. Furthermore, HydroFlam retains its mechanical strength for a long time in situations involving fire.

HydroFlam can be applied in both service class 1 and 2 (limited temperature and relative humidity) and is suitable for biological hazard classes 1 and 2 of EN Standard 335-3. Protection against direct contact with water is required.

HydroFlam is the best performing wood-based panel on the FR build product list.

STA listed:

HydroFlam is suitable as a structural board in applications where low reactivity to fire and flame spread are important (roofs, walls, stairwells, exit routes, lift shafts, corridors, ...) and where a higher resistance to fire is required (fire doors, fire walls …).

Use the recommended tools when sawing, milling or drilling HydroFlam boards. Fire-retardant products may cause deposits on tools and shorten service life. Bear in mind that the fire retardants used can influence the gluing and decorative finish of the boards.

General characteristics + Norm Unit Average values
Thickness EN 324-1 mm 12 18 22
Moisture level EN 322 % 6-10
Reaction to fire EN 13501-1 B-s2,d0
Technical characteristics + Norm Unit 5/95 percentile values
Bending strength EN 310 N/mm² 18 16 14
Internal bond EN 319 N/mm² 0,45 0,45 0,40
Bending stiffness EN 310 N/mm² 2550 2400 2150
Swelling/24h EN 317 % 11 10 10
Internal bond after cyclic test EN 321 option 1 N/mm² 0,25 0,22 0,20
Swelling/24h EN 317 % 12 12 11
Tongue and groove Quantities per pack
Thickness EN 324-1 12 18 22
2400x600     80
2400x1200   50  
TopFinish Quantities per pack
2800x1196 80    

Please contact our sales team for more information about the technical capabilities regarding custom thicknesses, dimensions, and finishes, and for minimum order requirements.

Fire retardant
Unilin Panels offers solutions for flame spread, flashover, smoke development and burnthrough time that meet the most stringent fire standards. The fire-retardant products of Unilin Panels are CE marked and regularly inspected by national and international agencies. Certificates and test reports are available upon request.
Material type
Load-bearing applications in humid conditions
Use in humid conditions
For structural applications

Tongue and groove
The tongue and groove profile ensures high stability and simple installation. The system makes it possible to nail or screw the panels blind.