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EN 13501-1

EN 13501-1: 2007

Fire Classification of Construction Products and Building elements – Classification using test data from reaction to fire tests +A1 : 2009

This standard provides the reaction to fire classification procedure for all construction products (including wood-based products).  It includes products incorporated within building elements.  It is referenced in the harmonised European standard for wood-based panel products, EN 13986.

Products are considered in relation to their end use application and divided into two separate categories – construction products, excluding floors; and flooring.

  • There are seven classes of reaction to fire , A1, A2, B, C, D, E and F, plus
  • Two sets of additional classifications for:

Smoke production – s1, s2 and s3

Flaming droplet/particles – d0, d1 and d2

 The five test methods used depending upon the end use application are:

  • Non-combustibility test                                         (prEN ISO 1182)
  • Calorific potential test                                            (prEN ISO 1716)
  • Single burning item test                                         (EN 13823)
  • Ignitability test                                                         (prEN ISO 11925-2)
  • Burning behaviour, flooring +radiant source    (prEN ISO 9239-1)

Table showing plywood and OSB reaction to fire classification, as per EN 13986

Wood-based panel product*

EN grade reference

Minimum density (kg/m3)

Minimum thickness (mm)

Excluding flooring



EN 636



D-s2, d0

DFL – s1


EN 300



D-s2, d0

DFL – s1

LVL No reaction classification given in any EN
*Wood-based panels mounted without an air gap directly against class A1 or A2-s1, d0 products with minimum density 10kg/m3 or at least class D-s2, d0 products with minimum density 400 kg/m3