prEN 16755
(Main)Classes of fire-retardant treated wood products in interior and exterior end use applications - Reaction to fire performance
Classes of fire-retardant treated wood products in interior and exterior end use applications - Reaction to fire performance
This document describes test methods and methods for classification of wood and wood-based products for which a stage in the production process results in an improvement of the reaction-to-fire classification in accordance with EN 13501-1 for use in interior and exterior situations (use classes 1, 2, and 3 as defined in EN 335:2013).
NOTE The classes of this document are not performance classes and do not give guidance for how long the reaction to fire classification of wood or wood-based product will last.
This document applies to
- wood and wood-based products (specific wood species, wood treated with preservatives and modified wood, for example thermally and chemically modified wood) that have been treated with fire-retardant chemical(s) applied either by a penetrating process or by a superficial process, such as with a film forming fire-retardant coating.
- wood-based products that incorporate fire retardant chemical(s) as part of the production process.
This document also covers fire-retardant wood and wood-based products that have a non-fire-retardant coating.
Mechanical properties, aesthetic properties, dimensional stability properties, service life and biological durability of fire-retardant wood and wood-based products are not covered by this document.
NOTE 2 This document is relevant for, but not limited to, products covered by these products standards: EN 13986, EN 14081-1, EN14374, EN 14915 and EN 16351.
NOTE 3 EAD 350865-00-1106 covers fire retardant products (coating) applied in situ.
Klassen der mit Feuerschutzmitteln behandelten Holzprodukte für Anwendungen im Innen- und Außenbereich - Verhalten bei Brandeinwirkung
Dieses Dokument beschreibt Prüfverfahren und Verfahren zur Klassifizierung von Holz und Holzprodukten, bei denen eine Phase des Produktionsprozesses zu einer Verbesserung der Klassifizierung des Brandverhaltens nach [7] für den Einsatz in Innen- und Außenbereichen (Nutzungsklassen 1, 2 und 3 nach [8]) führt.
ANMERKUNG 1 Die Klassen in diesem Dokument sind keine Leistungsklassen und enthalten keine Angaben darüber, wie lange die Klassifizierung des Brandverhaltens von Holz oder Holzprodukten gültig ist.
Dieses Dokument gilt für
Holz und Holzprodukte (bestimmte Holzarten, mit Schutzmitteln behandeltes Holz und modifiziertes Holz, z. B. thermisch und chemisch behandeltes Holz), die mit Feuerschutzchemikalien behandelt wurden, die entweder durch ein Eindringverfahren oder durch ein Oberflächenverfahren, wie z. B. mit einer filmbildenden Feuerschutzmittelbeschichtung, aufgetragen wurden.
Holzprodukte, die im Rahmen des Produktionsprozesses Feuerschutzchemikalien aufnehmen.
Dieses Dokument behandelt auch mit Feuerschutzmitteln behandeltes Holz und Holzprodukte mit einer Beschichtung ohne Feuerschutzmittel.
Mechanische Eigenschaften, ästhetische Eigenschaften, Eigenschaften der Maßhaltigkeit, Gebrauchsdauer und biologische Haltbarkeit von mit Feuerschutzmitteln behandeltem Holz und Holzprodukten werden in diesem Dokument nicht behandelt.
ANMERKUNG 2 Dieses Dokument ist u. a. relevant für Produkte, die unter diese Produktnormen fallen: [5], [9], [10], [11] und [12].
ANMERKUNG 3 EAD 350865 00 1106 [13] deckt Feuerschutzmittel (Beschichtung) ab, die in situ aufgetragen werden.
Classement des produits à base de bois ignifugés pour utilisation finale en intérieur et en extérieur – Performance de réaction au feu
Le présent document décrit les méthodes d'essai et les méthodes de classement des produits en bois et des matériaux à base de bois pour lesquels une étape de la fabrication conduit à une amélioration du classement de la réaction au feu conformément à [7] en vue d’une utilisation dans des situations en intérieur et en extérieur (classes d'emploi 1, 2 et 3 telles que définies en [8]).
NOTE 1 Les classes du présent document ne sont pas des classes de performance et ne donnent aucune recommandation quant à la durée du classement de la réaction au feu du produit en bois ou du matériau à base de bois.
Le présent document s'applique :
— aux produits en bois et aux produits à base de bois (essences de bois spécifiques, bois traité avec un produit de préservation et bois modifié, par exemple bois thermiquement et chimiquement modifié) qui ont été traités avec un ou plusieurs produits chimiques ignifuges appliqués par un processus d'imprégnation ou en surface, tel qu'un revêtement filmogène ignifuge ;
— aux matériaux à base de bois qui incorporent un ou plusieurs produits chimiques ignifuges dans leur fabrication.
Le présent document couvre également les produits en bois et les matériaux à base de bois ignifugés recouverts d'un revêtement non ignifuge.
Les propriétés mécaniques, les propriétés esthétiques, les propriétés de stabilité dimensionnelle, la durée de vie en service et la durabilité biologique des produits en bois et des matériaux à base de bois ignifugés ne sont pas couvertes par le présent document.
NOTE 2 Le présent document s'applique, sans s'y limiter, aux produits couverts par les normes de produits suivantes : [5], [9], [10], [11] et [12].
NOTE 3 L'EAD 350865-00-1106 [13] couvre les produits ignifuges (revêtement) appliqués in situ.
Razredi lesnih proizvodov, obdelanih z zaščitnimi sredstvi proti ognju, za uporabo v notranjih prostorih in na prostem - Odziv na ogenj
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
01-julij-2025
Razredi lesnih proizvodov, obdelanih z zaščitnimi sredstvi proti ognju, za uporabo
v notranjih prostorih in na prostem - Odziv na ogenj
Classes of fire-retardant treated wood products in interior and exterior end use
applications - Reaction to fire performance
Klassen der mit Feuerschutzmitteln behandelten Holzprodukte für Anwendungen im
Innen- und Außenbereich - Verhalten bei Brandeinwirkung
Classement des produits à base de bois ignifugés pour utilisation finale en intérieur et en
extérieur – Performance de réaction au feu
Ta slovenski standard je istoveten z: prEN 16755
ICS:
13.220.40 Sposobnost vžiga in Ignitability and burning
obnašanje materialov in behaviour of materials and
proizvodov pri gorenju products
71.100.50 Kemikalije za zaščito lesa Wood-protecting chemicals
79.040 Les, hlodovina in žagan les Wood, sawlogs and sawn
timber
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
DRAFT
EUROPEAN STANDARD
NORME EUROPÉENNE
EUROPÄISCHE NORM
April 2025
ICS 79.060.01 Will supersede EN 16755:2017
English Version
Classes of fire-retardant treated wood products in interior
and exterior end use applications - Reaction to fire
performance
Classement des produits à base de bois ignifugés pour Klassen der mit Feuerschutzmitteln behandelten
utilisation finale en intérieur et en extérieur - Holzprodukte für Anwendungen im Innen- und
Performance de réaction au feu Außenbereich - Verhalten bei Brandeinwirkung
This draft European Standard is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee
CEN/TC 175.
If this draft becomes a European Standard, CEN members are bound to comply with the CEN/CENELEC Internal Regulations
which stipulate the conditions for giving this European Standard the status of a national standard without any alteration.
This draft European Standard was established by CEN in three official versions (English, French, German). A version in any other
language made by translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC
Management Centre has the same status as the official versions.
CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and
United Kingdom.
Recipients of this draft are invited to submit, with their comments, notification of any relevant patent rights of which they are
aware and to provide supporting documentation.
Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without
notice and shall not be referred to as a European Standard.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2025 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 16755:2025 E
worldwide for CEN national Members.
Contents Page
European foreword . 3
Introduction . 4
1 Scope . 5
2 Normative references . 5
3 Terms and definitions . 5
3.1 Classes . 5
4 Symbols and abbreviations . 6
5 Requirements . 6
5.1 Wood and wood-based products . 6
5.2 Field of direct application of test results . 7
5.2.1 General fiéld of direct application . 7
5.2.2 Field of direct application for hygroscopic properties . 7
5.3 Reaction to firé performance . 8
5.3.1 Reaction to firé performance . 8
5.3.2 Reaction to firé performance before and after àrtificiàl or natural weathering . 8
5.4 Classes for reaction to firé performance . 8
5.4.1 General . 9
5.4.2 Class INT1 . 9
5.4.3 Class INT2 . 9
5.4.4 Class EXT . 9
5.4.5 Practice to use classes . 10
6 Classification report . 10
Annex A (normative) Hygroscopic properties of fire-retardant treated wood products
including those with fire-retardant coatings . 12
A.1 General . 12
A.2 Sampling, sample handling and preparation . 12
A.2.1 General procedure . 12
A.2.2 Procedure for end use products . 13
A.3 Test method . 14
A.3.1 Principle . 14
A.3.2 Equipment . 14
A.3.3 Testing environment . 14
Annex B (normative) Artificial weathering of fire-retardant treated wood for fire testing . 17
B.1 General . 17
B.2 Sampling, sample handling and preparation . 17
B.3 Test method . 17
B.3.1 Principle . 17
B.3.2 Equipment . 17
B.3.3 Testing environment . 18
Annex C (informative) Example of classification report — Classification report: Classes of
reaction to fire performance of fire-retardant wood products in interior and
exterior end use applications according to [22] . 20
C.1 Product . 20
C.2 Product spécificàtion . 20
C.3 Requirements . 21
C.4 Evaluation documents . 21
C.5 Reaction to firé performance class . 22
C.6 Applicability of class . 22
Bibliography . 23
European foreword
This document (prEN 16755:2025) has been prepared by Technical Committee CEN/TC 175 “Round
and sawn timber”, the secretariat of which is held by AFNOR.
This document is currently submitted to the CEN Enquiry.
This document will supersede [1].
In comparison with the previous edition, the following technical modificàtions have been made:
— Scope and title have been updated.
— The àrtificàl accelerated weathering methods have been reduced to the Artificiàl weathering
method (called Method B in the previous edition).
— Fire testing according to [2] has been excluded.
— New requirements on the number of SBI tests have been included.
— The clàssificàtion refers to use classes 1, 2 and 3 as définéd in [3] instead of service classes 1, 2 and
3 as définéd in [4].
— References to Service life have been removed.
— Wood-based panels have been included (Wood-based panels for construction are described in [5]).
Introduction
Fire-retardant treatments can considerably improve the reaction to firé properties of wood products
and these can result in wood products having the highest firé performance characteristics achievable
with any combustible product. However, the reaction to firé performance can be reduced by exposure
to wet and/or humid conditions [6] and the ability of the treated products to continue to perform even
when exposed to these conditions needs to be demonstrated.
Both wood and wood-based products treated with or incorporating firé retardants are covered. Fire-
retardant coatings and firé-rétàrdànt products with and without a coating, whether or not a firé-
rétàrdànt coating, are included.
1 Scope
This document describes test methods and methods for clàssificàtion of wood and wood-based products
for which a stage in the production process results in an improvement of the réàction-to-firé
clàssificàtion in accordance with [7] for use in interior and exterior situations (use classes 1, 2, and 3
as définéd in [8]).
NOTE 1 The classes of this document are not performance classes and do not give guidance for how long the
reaction to firé clàssificàtion of wood or wood-based product will last.
This document applies to
— wood and wood-based products (spécific wood species, wood treated with preservatives and
modifiéd wood, for example thermally and chemically modifiéd wood) that have been treated with
firé-rétàrdànt chemical(s) applied either by a penetrating process or by a supérficiàl process, such
as with a film forming firé-rétàrdànt coating.
— wood-based products that incorporate firé retardant chemical(s) as part of the production process.
This document also covers firé-rétàrdànt wood and wood-based products that have a non-firé-rétàrdànt
coating.
Mechanical properties, aesthetic properties, dimensional stability properties, service life and biological
durability of firé-rétàrdànt wood and wood-based products are not covered by this document.
NOTE 2 This document is relevant for, but not limited to, products covered by these products standards: [5],
[9], [10], [11] and [12].
NOTE 3 EAD 350865-00-1106 [13] c
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