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MDF B1 flame retardant – lightweight


B1 Type L-MDF-FR according to DIN EN 622-5   

 Datenblatt zum Download
approx. 600 kg/m3 bulk density                                                                               icon mdf fire-retardant    Stencil Original Spanolux

 MDF Firax B1 schwer entflammbar

Area of application

Fire-retardant lightweight MDF for general use in non-bearing dry environments.


MDF with low density and with a hard, finely sanded surface and a well screw-mountable core, with special fire-retardant properties. Suitable for industrial processing for interior decoration and furniture production. It can also be finished with paper, melamine, composite lay-ups or veneer. MDF Firax L is flame retardant (European fire behaviour class B) with has fire-retarding properties and helps prevent the fire from spreading. The boards emit low quantities of formaldehyde (class E1). Different national and international test reports are available. 

Using the product

MDF Firax L is suitable for applications that required high fire resistance like fire doors or walls, and application areas in which low fire behaviour and propagation of flames is important, such as e.g. staircases, evacuation routes, elevator shafts, halls. The boards are used especially in public buildings like hospitals, airports, roadhouses, theatres, hotels and the like.

The boards must be used only according to use class 1 (restrictions for ambient temperature and humidity) and hazard class 1, EN 335-3. The boards must have no direct contact with water. Any stacking must be done quickly on a pallet or with a sufficient number of crossbeams. Boards must not be stored upright unless floor contact can be ruled out. Under fluctuating humidity conditions, the boards either expand or shrink. Use suitable tools for sawing, milling and drilling.

The fire-retardant products and paints in the boards can impair specific glues or varnishes in exceptional cases. Always carry out advance tests.


Dimensions and stock program

Thickness: 10 to 25 mm standard – other thicknesses available upon request. Max. width and length: 244–255 to 635 cm. Spanolux has high capacity saws and can provide all dimensions. The pressing capacities generally enable delivery of all thicknesses, lengths and widths.

Stock programme

Thickness Dimensions
in mm in mm
  1220 x 2440 1220 x 3050
12 60 60
15 50 50
18 40 40
25 28 28

Refer to the individual items for details on packaging units in pcs.
You can find the data sheet with technical details in the   Downloadcenter.


Technical data

General properties + standard Einheit Average values
Thickness EN 324-1  mm 12 15 18 25
Thickness EN 323  Kg/m³ 630 620 620 620
Moisture content EN 322 % 6-10 6-10 6-10 6-10
Technical properties + standard   5/95 quantile values
Swelling/24u EN 317 % 16 14 14 12
Tensile strength EN 319 N/mm² 0,45 0,45 0,45 0,45
Bending strength EN 310 N/mm² 20 18 18 15
Bending elasticity modulus EN 310 N/mm² 1700 1600 1600 1500


General information

Property Standard Unit

Fibreboard specifications

Part 1: General requirements
Nominal diameter classes (mm)
19 >19
Tolerances with nominal dimensions:  
Thickness EN 324-1 mm ± 0,2 ± 0,3
Length and width EN 324-1 mm/m ± 2,0 mm/m, max. ± 5,0 mm
Perpendicularity EN 324-2 mm/m 2,0 mm/m
Deviations from the straightness of length and width EN 324-2 mm/m 1,5 mm/m
Tolerance for board thickness EN 323 % ± 7,0
Formaldehyde perforator class E1 EN 120 mg/100g 8


Spanolux has the following product certificates for MDF Firax: 

ISIB Belgium: A1
UK, Warrington Fire: class 1
France, CSTB: M1
France, CSTB melamine coated 80 to 160 g/m²: M1
Italy, Ministry of Internal Affairs: Classe Prime
Germany: B1
Spain, Applus: M1
Combustion:30 mm/hour or 0.5 mm/min