1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationDurability of reaction to fire performance Classes of fire-retardant treated wood-based product in interior and exterior end use applicationsPD CEN/TS 15912:2012National foreword
2、This Published Document is the UK implementation of CEN/TS 15912:2012.The UK participation in its preparation was entrusted to Technical CommitteeB/543, Round and sawn timber.A list of organizations represented on this committee can be obtained onrequest to its secretary.This publication does not pu
3、rport to include all the necessary provisions of acontract. Users are responsible for its correct application. The British Standards Institution 2012Published by BSI Standards Limited 2012ISBN 978 0 580 65579 1ICS 71.100.50Compliance with a British Standard cannot confer immunity fromlegal obligatio
4、ns.This Published Document was published under the authority of theStandards Policy and Strategy Committee on 30 April 2012.Amendments issued since publicationAmd. No. Date Text affectedPUBLISHED DOCUMENTPD CEN/TS 15912:2012TECHNICAL SPECIFICATION SPCIFICATION TECHNIQUE TECHNISCHE SPEZIFIKATION CEN/
5、TS 15912 April 2012 ICS 71.100.50 English Version Durability of reaction to fire performance - Classes of fire-retardant treated wood-based product in interior and exterior end use applications Durabilit des performances de raction au feu - Classement des produits base de bois ignifugs pour utilisat
6、ion finale en intrieur et en extrieur Dauerhaftigkeit des Verhaltens bei Brandeinwirkung - Klassen der mit Feuerschutzmitteln behandelten Holzprodukte fr Anwendungen im Innen- und Auenbereich This Technical Specification (CEN/TS) was approved by CEN on 14 February 2012 for provisional application. T
7、he period of validity of this CEN/TS is limited initially to three years. After two years the members of CEN will be requested to submit their comments, particularly on the question whether the CEN/TS can be converted into a European Standard. CEN members are required to announce the existence of th
8、is CEN/TS in the same way as for an EN and to make the CEN/TS available promptly at national level in an appropriate form. It is permissible to keep conflicting national standards in force (in parallel to the CEN/TS) until the final decision about the possible conversion of the CEN/TS into an EN is
9、reached. 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, Romania, Slovakia,
10、 Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: Avenue Marnix 17, B-1000 Brussels 2012 CEN All rights of exploitation in any form and by any means reserved worldw
11、ide for CEN national Members. Ref. No. CEN/TS 15912:2012: EPD CEN/TS 15912:2012CEN/TS 15912:2012 (E) 2 Contents Page Foreword 4Introduction .51 Scope 62 Normative references 63 Terms and definitions .64 Symbols 75 Requirements .75.1 Wood-based products and non-fire-retardant coating systems .75.2 Re
12、action to fire performance 85.2.1 Initial classification for reaction to fire 85.2.2 Reaction to fire performance before and after accelerated or natural weathering .85.3 Durability of reaction to fire performance .95.3.1 General 95.3.2 DRF Class ST .95.3.3 DRF Class INT1 95.3.4 DRF Class INT2 95.3.
13、5 DRF Class EXT .96 Practices to use the DRF classification system 117 Classification report . 11Annex A (informative) Test methods 13A.1 Hygroscopic properties of fire-retardant treated wood-based products including those with fire-retardant coatings . 13A.1.1 General . 13A.1.2 Field of application
14、 . 13A.1.3 Sampling, sample handling and preparation . 14A.1.4 Test method . 15A.2 Accelerated weathering of fire-retardant treated wood for fire testing . 17A.2.1 General . 17A.2.2 Field of application . 18A.2.3 Sampling, sample handling and preparation . 18A.2.4 Test method . 19A.3 Building materi
15、als and components in the vertical position: Exposure to accelerated climate strains . 21A.3.1 General . 21A.3.2 Field of application . 21A.3.3 Sampling 21A.3.4 Test method . 22Annex B (informative) Example of classification report . 26B.1 Classification report: Durability classes of reaction to fir
16、e performance of fire-retardant wood-based products in interior and exterior end use applications according to CEN/TS 15912 26B.1.1 Product 26B.1.2 Product specification . 26B.1.3 Requirements 27B.1.4 Evaluation documents . 27B.1.5 Durability of reaction to fire performance (DRF) Class 28B.1.6 Appli
17、cability of DRF Class . 28PD CEN/TS 15912:2012CEN/TS 15912:2012 (E) 3 B.1.7 Service life 29Bibliography 30PD CEN/TS 15912:2012CEN/TS 15912:2012 (E) 4 Foreword This document (CEN/TS 15912:2012) has been prepared by Technical Committee CEN/TC 175 “Round and sawn timber”, the secretariat of which is he
18、ld by AFNOR. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN and/or CENELEC shall not be held responsible for identifying any or all such patent rights. According to the CEN/CENELEC Internal Regulations, the national standards
19、 organisations of the following countries are bound to announce this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland
20、, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. PD CEN/TS 15912:2012CEN/TS 15912:2012 (E) 5 Introduction Fire-retardant treatments may considerably improve the reaction to fire properties of wood and wood-based products and these may result in wood
21、 having the highest fire-resisting characteristics achievable with any combustible product. However, the reaction to fire performance may be reduced by exposure to wet and/or humid conditions 1 and the ability of treatments to continue to perform even when exposed to these conditions needs to be dem
22、onstrated. Two aspects of fire durability of the fire-retardant treatment of wood-based products need to be considered. One is the risk for high moisture content and migration of the fire-retardant chemicals within the wood product and salt crystallisation on the product surface. These hygroscopic p
23、roperties of the treated wood-based product can be 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 w
24、eathering needs to be verified. The Technical Specification is based on a Nordtest standard 15 and on experience from North America 7 12. PD CEN/TS 15912:2012CEN/TS 15912:2012 (E) 6 1 Scope This European Technical Specification describes the characteristics which fire-retardant treated wood products
25、 should exhibit so that their fire-retardant properties persist undiminished throughout the desired service life in the anticipated conditions of use. The Technical Specification prescribes the classification requirements for the durability of the reaction to fire performance of fire-retardant treat
26、ed wood-based products to be used in interior and exterior end use conditions. The products initially need to meet required reaction to fire classification. For interior and exterior use, limited hygroscopicity needs to be verified. In addition, products for exterior use needs to meet the minimum du
27、rability of reaction to fire performance requirements specific to the end use. The requirements are applicable for fire-retardant treated (applied by penetrating and superficial processes or with film forming or intumescent fire-retardant coatings) solid wood and wood-based products and wood-based p
28、roducts in which the fire-retardant is incorporated during manufacture. The fire-retardant treated products may be coated with an ordinary paint. Mechanical properties and biological durability of fire-retardant treated wood products are not covered by this European Technical Specification. Paints,
29、coatings and varnishes intended to improve the reaction to fire performance of a construction product when incorporated in the works, i.e. a building, are covered by ETAG 028 19. This Technical Specification may be used as a basis for an approval system. 2 Normative references The following document
30、s, 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 undated references, the latest edition of the referenced document (including any amendments) applies. EN 927-3, Paints and varnishe
31、s Coating materials and coating systems for exterior wood Part 3: Natural weathering test EN 13238, Reaction to fire tests for building products Conditioning procedures and general rules for selection of substrates EN 13823, Reaction to fire tests for building products Building products excluding fl
32、oorings exposed to the thermal attack by a single burning item 3 Terms and definitions For the purposes of this document, the following terms and definitions apply. 3.1 durability of reaction to fire performance DRF four classes for the Durability of Reaction to Fire performance are defined: DRF Cla
33、ss ST for short term use (e.g. less than one year); no durability performance shall be verified; DRF Class INT1 for permanent use in interior applications, service class 1 (e.g. wall and ceiling products); PD CEN/TS 15912:2012CEN/TS 15912:2012 (E) 7 DRF Class INT2 for permanent use in interior appli
34、cations and certain protected exterior applications, service class 2 (e.g. wall and ceiling products); DRF Class EXT for permanent use in exterior applications, service class 3 (e.g. facade claddings, exterior conditions) 3.2 service classes 3.2.1 dry condition moisture content in the materials corr
35、esponding to a temperature of 20 C and the relative humidity of the surrounding air only exceeding 65 % for a few weeks per year Note 1 to entry: In Eurocode EN 1995-1-1 as Service class 1. 3.2.2 humid condition moisture content in the material corresponding to a temperature of 20 C and a relative h
36、umidity of the surrounding air only exceeding 85 % for a few weeks per year Note 1 to entry: In EN 1995-1-1 defined as Service class 2. 3.3 ordinary paint non-fire retardant paint 4 Symbols The symbols for DRF Classes ST, INT1, INT2 and EXT are the followings: Figure 1 Proposed symbols for classes 5
37、 Requirements 5.1 Wood-based 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. Remaining fire-retardant chemicals in terms of kg/m3of the final wood-based produ
38、ct, or in terms of kg/m2for surface treated products, shall be specified. Values shall be given for products conditioned at (50 5) % relative humidity at (23 2) C (as for fire testing). For products in DRF Classes INT and EXT the following procedures shall be provided by the manufacturers: type of m
39、aintenance; interval of maintenance; time until to the first maintenance/recoating (if relevant); PD CEN/TS 15912:2012CEN/TS 15912:2012 (E) 8 coating system to be used initially and at maintenance (if relevant). Verification of DRF Class EXT obtained without a coating system (with an ordinary paint)
40、 is valid also for the same product coated, provided that the coating does not reduce the reaction to fire performance. NOTE The maintained fire performance of a coated product (with an ordinary paint) may be verified by fire testing e.g. in the cone calorimeter. Verification of DRF Class EXT is val
41、id for thicker wood-based products than verified, but not for thinner. 5.2 Reaction to fire performance 5.2.1 Initial classification for reaction to fire Classification testing for reaction to fire performance shall be performed. The products have to fulfil a specified fire performance according to
42、a recognised reaction to fire standard. Relevant systems are, for instance, the European reaction to fire classification system according to EN 13501-1 and for products which are not used in construction, the IMO Code FTP 2. 5.2.2 Reaction to fire performance before and after accelerated or natural
43、weathering 5.2.2.1 General Reaction to fire performance before and after weather exposure shall be performed according to 5.2.2.2. The weather exposure shall be performed according to an accelerated procedure, see A.2, or a similar accelerated test procedure, e.g. 5 months exposure in A.3, or natura
44、l weathering according to EN 927-3, or at relevant and specified outdoor conditions for at least 5 years. NOTE 1 For the accelerated weathering, it is essential that the exposed samples are large enough to be fire tested. Thus the minimum width is 100 mm (minimum according to ISO 5660-1). NOTE 2 For
45、 the accelerated weathering, it is also essential that the exposed samples are large enough to fulfil the cutting requirements in 5.2.2.2.2 and A.2. NOTE 3 For the natural weathering, exposure at 45 slope is recommended. Natural weathering at relevant conditions for the specific end use is most desi
46、rable, but such data are usually not available. It is recommended that a set of the products going through an accelerated weathering procedure is also exposed to natural weathering. Additional variations of the product, e g additional coating systems (with ordinary paints), could preferably be evalu
47、ated at the same time. Examples of weathering studies are given in 4 5. 5.2.2.2 Testing for reaction to fire performance 5.2.2.2.1 Generality The reaction to fire performance after weathering shall be tested according to one of the following two procedures: 5.2.2.2.2 Classification testing The same
48、test methods as for the initial classification according to 5.2.1 may be used. For testing according to EN 13823, only one replicate may be used for the fire testing after weathering. PD CEN/TS 15912:2012CEN/TS 15912:2012 (E) 9 5.2.2.2.3 Small scale testing Alternatively, fire testing may be perform
49、ed according to ISO 5660-1 (cone calorimeter) at a heat flux 50 kW/m2for at least 1 200 s. Conditioning for ISO 5660-1 tests is carried out in the same way as according to EN 13238. If this alternative is chosen, testing of the product before weathering is also needed for comparison of the fire performance before and after weathering. NOTE 1 This alternative is justified by correlation studies with methods for class
