1、Durability of reaction to fire performance - Classes of fire-retardant treated wood products in interior and exterior end use applicationsBS EN 16755:2017BSI Standards PublicationWB11885_BSI_StandardCovs_2013_AW.indd 1 15/05/2013 15:06EUROPEANSTANDARDNORME EUROPENNE EUROPISCHE NORMEN 16755 October 2
2、017ICS 13.220.40; 13.220.50; 71.100.50EnglishVersionDurability of reaction to fire performance - Classes of fire-retardant treated wood products in interior and exteriorend use applications Durabilit des performancesde raction aufeu -Classement des produits base de bois ignifugs pourutilisation fina
3、le en intrieur eten extrieur Dauerhaftigkeit des Verhaltensbei Brandeinwirkung - Klassen der mit Feuerschutzmitteln behandeltenHolzprodukte fr Anwendungen im Innen- undAuenbereichThis European Standard was approved by CEN on 2 July 2017.CEN members are bound to comply with the CEN/CENELEC Internal R
4、egulations which stipulate the conditions for giving thisEuropean Standard the status of a national standard without any alteration.Up-to-date lists and bibliographical referencesconcerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN memb
5、er. This European Standard exists in three official versions (English, French, German). A version in any other language made bytranslation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC ManagementCentre has the same status as the officialversions.CEN m
6、embers are the nationalstandards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Port
7、ugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMIT EUROPEN DE NORMALISATIONEUROPISCHES KOMITEE FR NORMUNGCEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels 2017 CEN All rights of exploitation in a
8、ny form and by any means reservedworldwide for CENnational Members.Ref. No. EN 16755:2017 ENational forewordThis British Standard is the UK implementation of EN 16755:2017.The UK participation in its preparation was entrusted to Technical Committee B/543, Round and sawn timber.A list of organization
9、s represented on this committee can be obtained on request to its secretary.BSI, as a member of CEN, is obliged to publish EN 16755 as a British Standard. However, attention is drawn to the fact that during the development of this European Standard, the UK committee voted against its approval as a E
10、uropean Standard.The committee advises the reader that the scope of the standard is limited to solid wood products and excludes wood-based panels. The committee feels that wood-based panels are an important element of the flame retardant market and the durability of reaction to fire performance of w
11、ood-based panels is equally important as for solid wood. The test methods in this standard may be used for both solid wood and for wood-based panels whose structural characteristics (behaviour when exposed to high humidity or rain) make them suitable for use in those environments.The criteria for de
12、monstrating durability of reaction to fire performance of wood used externally (EXT class) as set out in 5.3.4, Table 1, note d is, in the opinion of the UK committee, unreliable as an indication that performance is maintained in service. For UK purposes the committee recommends that maintenance of
13、reaction to fire performance should be demonstrated by Heat Release Rate (appropriate to RTF class) alone.This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. The British Standards Institution 2017 Published by BS
14、I Standards Limited 2017ISBN 978 0 580 86488 9ICS 71.100.50; 13.220.50; 13.220.40Compliance with a British Standard cannot confer immunity from legal obligations. This British Standard was published under the authority of the Standards Policy and Strategy Committee on 31 October 2017.Amendments/corr
15、igenda issued since publicationDate Text affectedBRITISH STANDARDBS EN 16755:2017EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 16755 October 2017 ICS 13.220.40; 13.220.50; 71.100.50 English Version Durability of reaction to fire performance - Classes of fire-retardant treated wood products in
16、 interior and exterior end use applications Durabilit des performances de raction au feu - Classement des produits base de bois ignifugs pour utilisation finale en intrieur et en extrieur Dauerhaftigkeit des Verhaltens bei Brandeinwirkung - Klassen der mit Feuerschutzmitteln behandelten Holzprodukte
17、 fr Anwendungen im Innen- und Auenbereich This European Standard was approved by CEN on 2 July 2017. 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. Up
18、-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN member. This European Standard exists in three official versions (English, French, German). A version in any other language made by trans
19、lation 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, Finlan
20、d, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom. EUROPEAN COMMITTEE FOR STANDAR
21、DIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels 2017 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 16755:2017 EBS EN 16755:2017EN 16755:2017
22、(E) 2 Contents Page European foreword . 3 Introduction 4 1 Scope 5 2 Normative references 5 3 Terms and definitions . 6 4 Symbols and abbreviations . 6 5 Requirements . 6 5.1 Wood products and non-fire-retardant coating systems . 6 5.2 Reaction to fire performance 7 5.2.1 Initial classification for
23、reaction to fire 7 5.2.2 Reaction to fire performance before and after accelerated or natural weathering . 7 5.3 Durability of reaction to fire performance 8 5.3.1 General 8 5.3.2 DRF Class INT1 . 8 5.3.3 DRF Class INT2 . 8 5.3.4 DRF Class EXT . 9 5.3.5 Practise to use DRF classes . 10 6 Classificat
24、ion report 11 Annex A (normative) Hygroscopic properties of fire-retardant treated wood products including those with fire-retardant coatings . 12 A.1 General . 12 A.2 Field of application 12 A.3 Sampling, sample handling and preparation . 13 A.3.1 General procedure . 13 A.3.2 Procedure for end use
25、products . 14 A.4 Test method . 14 A.4.1 Principle 14 A.4.2 Equipment 14 A.4.3 Testing environment 14 Annex B (normative) Accelerated weathering of fire-retardant treated wood for fire testing 17 B.1 General . 17 B.2 Field of application 17 B.3 Sampling, sample handling and preparation . 17 B.4 Test
26、 method . 18 B.4.1 Principle 18 B.4.2 Equipment 18 B.4.3 Testing environment 19 Annex C (informative) Example of classification report Classification report: Durability classes of reaction to fire performance of fire-retardant wood products in interior and exterior end use applications according to
27、EN 16755:2017 22 Bibliography . 26 BS EN 16755:2017EN 16755:2017 (E) 3 European foreword This document (EN 16755:2017) has been prepared by Technical Committee CEN/TC 175 “Round and sawn timber”, the secretariat of which is held by AFNOR. This European Standard shall be given the status of a nationa
28、l standard, either by publication of an identical text or by endorsement, at the latest by April 2018, and conflicting national standards shall be withdrawn at the latest by April 2018. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent righ
29、ts. CEN shall not be held responsible for identifying any or all such patent rights. According to the CEN-CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Re
30、public, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kin
31、gdom. BS EN 16755:2017EN 16755:2017 (E) 4 Introduction Fire-retardant treatments may considerably improve the reaction to fire properties of wood products and these may result in wood products having the highest fire performance characteristics achievable with any combustible product. However, the r
32、eaction to fire performance may be reduced by exposure to wet and/or humid conditions 11 and the ability of the treated products to continue to perform even when exposed to these conditions needs to be demonstrated. Two aspects of the reaction to fire durability of fire-retardant wood products need
33、to be considered. One is the risk for high moisture content and migration of the fire-retardant chemicals within the wood product and salt crystallization on the product surface that may fall off and reduce the improved fire properties. These hygroscopic properties of the treated wood product can be
34、 evaluated by exposure to high relative humidity. The other aspect is the risk for decreased fire performance due to loss of the fire-retardant chemicals by leaching in exterior applications, e.g. facade claddings. Maintained fire performance after weathering needs to be verified. This standard is b
35、ased on the Technical Specification CEN/TS 15912, on a Nordtest standard 20 and on experience from North America 10, 9. BS EN 16755:2017EN 16755:2017 (E) 5 1 Scope This European Standard describes the characteristics for fire-retardant treated wood products. NOTE 1 It is based on maintaining perform
36、ance undiminished throughout the desired service life in the anticipated conditions of use. The European Standard prescribes the classification requirements for the durability of the reaction to fire performance of fire-retardant treated wood products to be used in interior and exterior end use cond
37、itions. This European Standard applies to wood which has been treated during a production process with fire retardant products applied either by a penetration process or by a superficial process, such as with a film forming or intumescent fire retardant coating. It covers fire-retardant treated prod
38、ucts that are coated with an ordinary paint. Mechanical properties and biological durability of fire-retardant treated wood products are not covered by this European Standard. NOTE 2 This standard can be used for other manufactured wood products. This standard covers wood products. It doesnt cover w
39、ood-based panels. NOTE 3 Wood based panels for construction are described in EN 13986. 2 Normative references The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For
40、 undated references, the latest edition of the referenced document (including any amendments) applies. EN 927-3, Paints and varnishes Coating materials and coating systems for exterior wood Part 3: Natural weathering test EN 927-6, Paints and varnishes Coating materials and coating systems for exter
41、ior wood Part 6: Exposure of wood coatings to artificial weathering using fluorescent UV lamps and water EN 13238, Reaction to fire tests for building products Conditioning procedures and general rules for selection of substrates EN 13501-1, Fire classification of construction products and building
42、elements Part 1: Classification using data from reaction to fire tests EN 13823, Reaction to fire tests for building products Building products excluding floorings exposed to the thermal attack by a single burning item ISO 5660-1, Reaction-to-fire tests Heat release, smoke production and mass loss r
43、ate Part 1: Heat release rate (cone calorimeter method) and smoke production rate (dynamic measurement) BS EN 16755:2017EN 16755:2017 (E) 6 3 Terms and definitions For the purposes of this document, the following terms and definitions apply. 3.1 service classes 3.1.1 dry condition DRF INT1 moisture
44、content in the materials corresponding to a temperature of 20 C and the relative humidity of the surrounding air exceeding 65 % only for a few weeks per year Note 1 to entry: In Eurocode EN 199511 as Service class 1. 3.1.2 humid condition DRF INT2 moisture content in the material corresponding to a
45、temperature of 20 C and a relative humidity of the surrounding air exceeding 85 % only for a few weeks per year Note 1 to entry: In EN 199511 defined as Service class 2. 3.2 ordinary paint non-fire retardant paint 4 Symbols and abbreviations The symbols for DRF Classes INT1, INT2 and EXT are the fol
46、lowing ones: Figure 1 Proposed symbols for classes 5 Requirements 5.1 Wood products and non-fire-retardant coating systems The treatment manufacturing process and application rate declared by the producer shall be declared by the manufacturer of the final product. Actual fire-retardant retention sha
47、ll be expressed in kg/m3of the final wood product, or in kg/m2for surface treated products. Values shall be given for products conditioned at (50 5)% relative humidity at (23 2) C (as for fire testing) according to EN 13238. For products in DRF Classes INT and EXT procedures for maintenance shall be
48、 provided by the manufacturers regarding: type of maintenance; interval of maintenance; BS EN 16755:2017EN 16755:2017 (E) 7 time until to the first maintenance/recoating (if relevant); coating system to be used initially and at maintenance (if relevant). Verification of DRF Class EXT obtained withou
49、t a coating system (with an ordinary paint) is valid also for the same product coated, provided that the coating does not reduce the reaction to fire performance. The maintained fire performance of a coated product (with an ordinary paint) may be verified by fire testing according to EN 13823 or ISO 5660-1. Verification of DRF Class EXT is valid for thicker wood products than verified, but not for thinner. 5.2 Reaction to fire performance 5.2.1 Initial classification for reaction to fire Classification testing
