SIST CEN/TS 15912:2012

Durability of reaction to fire performances - Classes of fire retardant treated wood-based product in interior and exterior end use applications

This EN prescribes the classification requirements for the durability of the reaction to fire performance of fire-retardant treated wood-based products to be used in interior and exterior end use conditions.

Dauerhaftigkeit des Verhaltens bei Brandeinwirkung - Klassen von mit Feuerschutzmitteln behandelten Holzprodukten für Anwendungen im Innen- und Außenbereich

Die vorliegende Europäische Norm beschreibt die Eigenschaften, die mit Feuerschutzmitteln behandelte
Holzprodukte aufweisen sollten, um sicherzustellen, dass deren Feuerschutz-Eigenschaften über die gewünschte
Gebrauchsdauer in den angenommen Bedingungen, unvermindert vorhalten.
Die Norm schreibt die Klassifizierungsanforderungen an die Dauerhaftigkeit des Verhaltens bei
Brandeinwirkung von mit Feuerschutzmitteln behandelten Holzprodukten vor, die in der Endanwendung in
Innen- und Außenbereichen gelten. Die Produkte müssen zunächst die erforderliche Klassifizierung
Brandverhaltens erreichen. Für Innen- und Außenanwendungen ist die begrenzte Hygroskopizität
nachzuweisen. Darüber hinaus müssen Produkte für Außenanwendungen die für die Endanwendung
spezifischen Mindestanforderungen an die Dauerhaftigkeit des Verhaltens bei Brandeinwirkung erfüllen.
Die Anforderungen gelten für mit Feuerschutzmitteln behandeltes (auf-/eingebracht durch eindringende oder
oberflächlichen Verfahren oder Film bildende oder Intumeszenz-Beschichtungen) Vollholz sowie für Holzprodukte.
Die Produkte dürfen mit einem üblichen Anstrich beschichtet sein.
Mechanische Eigenschaften und die biologische Dauerhaftigkeit von mit Feuerschutzmitteln behandelten
Holzprodukten sind kein Bestandteil der vorliegenden Europäischen Norm.
Farben, Lacke und Beschichtungen, die dazu dienen das Verhalten bei Brandeinwirkung eines eingebauten
Bauprodukts zu verbessern, sind durch ETAG 028 [19], abgedeckt.
Diese Norm kann als eine Grundlage für ein Anerkennungssystem dienen.

Durabilité des performances de réaction au feu - Classes de produits à base de bois ignifugés pour utilisation finale en intérieur et en extérieur

La présente Norme européenne prescrit les exigences de classification pour la durabilité des performances de réaction au feu des produits à base de bois ignifugés, destinés à être employés dans des conditions d'utilisation finale en intérieur et en extérieur. Les produits doivent d'abord satisfaire au classement exigé de réaction au feu. En outre, les produits destinés à être utilisés en extérieur doivent satisfaire aux exigences minimales de durabilité de la performance de réaction au feu spécifiques à l'utilisation finale.
L'hygroscopicité réduite des produits utilisés en intérieur doit être vérifiée. Pour les produits utilisés à l'extérieur, le niveau de performance de réaction au feu doit être maintenu après vieillissement accéléré ou naturel par les agents atmosphériques.
Les exigences sont applicables aux produits en bois massif et aux produits à base de bois ayant fait l'objet d'un traitement ignifugeant (par imprégnation et/ou traitement de surface). Les produits peuvent être revêtus.
Les exigences relatives à l'utilisation finale en intérieur peuvent être appliquées pour toute utilisation permanente de produits à base de bois ignifugés, par exemple les meubles et les produits d'isolation en cellulose et en matériaux dérivés du bois ayant fait l'objet d'un traitement d'ignifugation.
Les propriétés mécaniques et la durabilité biologique des produits en bois ignifugés ne sont pas couvertes par la présente Norme européenne.
La présente norme peut être utilisée comme base d'un système d’agrément.

Trajnost odziva na ogenj - Razredi zaščitenih lesnih proizvodov, obdelanih z zaščitnimi sredstvi proti ognju za uporabo v notranjih prostorih in na prostem

Ta standard EN predpisuje zahteve za razvrstitev na področju trajnosti odziva na ogenj za lesne proizvode, obdelane z zaščitnimi sredstvi proti ognju, ki so namenjeni za uporabo pod pogoji končne uporabe, tj. v notranjih prostorih in na prostem.

General Information

• Status: Withdrawn
• Public Enquiry End Date: 30-May-2009
• Publication Date: 08-Aug-2012
• Withdrawal Date: 31-Aug-2020
• ICS: 71.100.50 - Wood-protecting chemicals
• Technical Committee: LLZ - Les, lesni izdelki in zaščita lesa
• Current Stage: 9900 - Withdrawal (Adopted Project)
• Start Date: 25-Aug-2020
• Due Date: 17-Sep-2020
• Completion Date: 01-Sep-2020
• Ref Project: CEN/TS 15912:2012 - Durability of reaction to fire performance - Classes of fire-retardant treated wood-based product in interior and exterior end use applications

Relations

• Replaced By: SIST EN 16755:2017 - Durability of reaction to fire performance - Classes of fire-retardant treated wood products in interior and exterior end use applications
• Effective Date: 10-Jan-2018

Standards Content (Sample)

SLOVENSKI STANDARD
SIST CEN/TS 15912:2012
01-september-2012
7UDMQRVWRG]LYDQDRJHQM5D]UHGL]DãþLWHQLKOHVQLKSURL]YRGRYREGHODQLK]
]DãþLWQLPLVUHGVWYLSURWLRJQMX]DXSRUDERYQRWUDQMLKSURVWRULKLQQDSURVWHP
Durability of reaction to fire performances - Classes of fire retardant treated wood-based
product in interior and exterior end use applications
Dauerhaftigkeit des Verhaltens bei Brandeinwirkung - Klassen von mit
Feuerschutzmitteln behandelten Holzprodukten für Anwendungen im Innen- und
Außenbereich
Durabilité des performances de réaction au feu - Classes de produits à base de bois
ignifugés pour utilisation finale en intérieur et en extérieur
Ta slovenski standard je istoveten z: CEN/TS 15912:2012
ICS:
71.100.50 .HPLNDOLMH]D]DãþLWROHVD Wood-protecting chemicals
SIST CEN/TS 15912:2012 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

---------------------- Page: 1 ----------------------

SIST CEN/TS 15912:2012

---------------------- Page: 2 ----------------------

SIST CEN/TS 15912:2012


TECHNICAL SPECIFICATION
CEN/TS 15912

SPÉCIFICATION TECHNIQUE

TECHNISCHE SPEZIFIKATION
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
Durabilité des performances de réaction au feu - Dauerhaftigkeit des Verhaltens bei Brandeinwirkung -
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
Außenbereich
This Technical Specification (CEN/TS) was approved by CEN on 14 February 2012 for provisional application.

The 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 this 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 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, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom.





EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2012 CEN All rights of exploitation in any form and by any means reserved Ref. No. CEN/TS 15912:2012: E
worldwide for CEN national Members.

---------------------- Page: 3 ----------------------

SIST CEN/TS 15912:2012
CEN/TS 15912:2012 (E)
Contents Page
Foreword .4
Introduction .5
1 Scope .6
2 Normative references .6
3 Terms and definitions .6
4 Symbols .7
5 Requirements .7
5.1 Wood-based products and non-fire-retardant coating systems .7
5.2 Reaction to fire performance .8
5.2.1 Initial classification for reaction to fire .8
5.2.2 Reaction to fire performance before and after accelerated or natural weathering .8
5.3 Durability of reaction to fire performance .9
5.3.1 General .9
5.3.2 DRF Class ST .9
5.3.3 DRF Class INT1 .9
5.3.4 DRF Class INT2 .9
5.3.5 DRF Class EXT .9
6 Practices to use the DRF classification system . 11
7 Classification report . 11
Annex A (informative) Test methods . 13
A.1 Hygroscopic properties of fire-retardant treated wood-based products including those
with fire-retardant coatings . 13
A.1.1 General . 13
A.1.2 Field of application . 13
A.1.3 Sampling, sample handling and preparation . 14
A.1.4 Test method . 15
A.2 Accelerated weathering of fire-retardant treated wood for fire testing . 17
A.2.1 General . 17
A.2.2 Field of application . 18
A.2.3 Sampling, sample handling and preparation . 18
A.2.4 Test method . 19
A.3 Building materials and components in the vertical position: Exposure to accelerated
climate strains . 21
A.3.1 General . 21
A.3.2 Field of application . 21
A.3.3 Sampling . 21
A.3.4 Test method . 22
Annex B (informative) Example of classification report . 26
B.1 Classification report: Durability classes of reaction to fire performance of fire-retardant
wood-based products in interior and exterior end use applications according to CEN/TS
15912 . 26
B.1.1 Product . 26
B.1.2 Product specification . 26
B.1.3 Requirements . 27
B.1.4 Evaluation documents . 27
B.1.5 Durability of reaction to fire performance (DRF) Class . 28
B.1.6 Applicability of DRF Class . 28
2

---------------------- Page: 4 ----------------------

SIST CEN/TS 15912:2012
CEN/TS 15912:2012 (E)
B.1.7 Service life . 29
Bibliography . 30

3

---------------------- Page: 5 ----------------------

SIST CEN/TS 15912:2012
CEN/TS 15912:2012 (E)
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 held 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 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, Portugal, Romania, Slovakia, Slovenia, Spain,
Sweden, Switzerland, Turkey and the United Kingdom.

4

---------------------- Page: 6 ----------------------

SIST CEN/TS 15912:2012
CEN/TS 15912:2012 (E)
Introduction
Fire-retardant treatments may considerably improve the reaction to fire properties of wood and wood-based
products and these may result in wood 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 demonstrated.
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 properties 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 weathering needs to
be verified.
The Technical Specification is based on a Nordtest standard [15] and on experience from North America [7]
[12].
5

---------------------- Page: 7 ----------------------

SIST CEN/TS 15912:2012
CEN/TS 15912:2012 (E)
1 Scope
This European Technical Specification describes the characteristics which fire-retardant treated wood
products 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 treated 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 durability 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 products 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, 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 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 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 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 floorings 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 Class 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);
6

---------------------- Page: 8 ----------------------

SIST CEN/TS 15912:2012
CEN/TS 15912:2012 (E)
 DRF Class INT2 for permanent use in interior applications 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 corresponding to a temperature of 20 ºC 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 humidity 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 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
3
manufacturer of the final product. Remaining fire-retardant chemicals in terms of kg/m of the final wood-
2
based product, or in terms of kg/m for 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 maintenance;
 interval of maintenance;
 time until to the first maintenance/recoating (if relevant);
7

---------------------- Page: 9 ----------------------

SIST CEN/TS 15912:2012
CEN/TS 15912:2012 (E)
 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) 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 valid 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 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 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 natural 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 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 desirable, 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
evaluated 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 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.
8

---------------------- Page: 10 ----------------------

SIST CEN/TS 15912:2012
CEN/TS 15912:2012 (E)
5.2.2.2.3 Small scale testing
Alternatively, fire testing may be performed according to ISO 5660-1 (cone calorimeter) at a heat flux
2
50 kW/m for 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 classification test methods, e.g. [16] [17]
[18].
The preparation of small test specimens of fire-retardant treated wood and wood based products are very
important for the test results obtained, since the amount of fire-retardant chemicals may vary between small
samples. This is especially important for impregnated solid wood products. Such specimens shall therefore be
cut in order to represent the fire properties of the full wood plank. A suitable procedure is specified in [3].
NOTE 2 The following conclusions on sampling of wood panelling are given in [3]:
− Specimens should be cut approximately 1 m from the end of the plank;
− Specimens should not have knots in the centre area – knots covered by the frame may be used.
5.3 Durability of reaction to fire performance
5.3.1 General
The following items shall be reported for each DRF class.
5.3.2 DRF Class ST
 Reaction to fire class, initial, according to 5.2.1.
5.3.3 DRF Class INT1
 Reaction to fire class, initial, according to 5.2.1;
 Hygroscopic properties at (70 ± 5) % RH and (25 ± 2) °C according to A.1. The test shall be carried out
with samples uncoated (with an ordinary paint). The equilibrium moisture content shall be < 20 %.
5.3.4 DRF Class INT2
 Reaction to fire class, initial, according to 5.2.1;
 Hygroscopic properties at (90 ± 5) % RH and (27 ± 2) °C according to A.1. The test shall be carried out
with samples uncoated (with an ordinary paint). The equilibrium moisture content shall be < 28 %.
5.3.5 DRF Class EXT
a) Reaction to fire class, initial, according to 5.2.1:
1) Initial fire class;
2) Maintained fire performance after weathering according to 5.2.2.1 and Table 1;
b) Hygroscopic properties at (90 ± 5) % RH and (27 ± 2) °C according to A.1. The test shall be carried out
with samples uncoated (with an ordinary paint). Equilibrium moisture content shall be < 28 %.
9

---------------------- Page: 11 ----------------------

SIST CEN/TS 15912:2012
CEN/TS 15912:2012 (E)
NOTE 1 Products in DRF Class EXT meet the criteria DRF Class INT1 and INT2, but not vice versa.
NOTE 2 Background information on cirtieria for reaction to fire performance is available in [16] [17] [18].
Table 1 — Requirements for DRF Classes of fire-retardant wood-based products in interior and
exterior end use applications
DRF class Existing fire Additional performance requirements at different end
a
requirements use of fire-retardant wood-based products
b
Intended Reaction to fire Hygroscopic properties  Reaction to fire
use class, initial performance after
weather exposure
ST Short term Relevant fire class - -
INT1 Interior dry Relevant fire class - Moisture content < 20 % -
applications - No exudation of liquid
- Minimum visible salt with no
increase at surface
INT2 Interior Relevant fire class - Moisture content < 28 % -
humid - No exudation of liquid
applications - Minimum visible salt with no
increase at surface
  Maintained reaction to fire
e c, d
EXT Exterior Relevant fire class - Moisture content < 28 % performance  after
applications - No exudation of liquid - Accelerated weathering
- Minimum visible salt with no or
increase at surface  - Natural weathering or
- Other referenced and
recognised weathering
method

Application of specified
maintenance may be
included.
a
To be fulfilled using product produced in the same way using the same manufacturing process and having a similar retention
level as for the reaction to fire performance.
b
For INT1 at (70 ± 5) % RH and (25 ± 2) °C and for INT2 at ( 90 ± 5) % RH and (27 ± 2) °C according to A.1. Classes INT1,
INT2 and EXT are only applicable for product application rates less than or equal to the highest level tested. Wood products
treated to higher application rates will be assumed to be Class ST.
c
Criteria for fire testing according to 5.2.2.2.2 after weather exposure:
2
Class B products: RHR ≤ 150 kW/m during 600s after ignition and THR increase < 20 % compared to testing before the
30s ave 600s
weather exposure.
2
Class C products: RHR ≤ 220 kW/m during 600s after ignition and THR increase < 20 % compared to testing before the
30s ave 600s
weather exposure.
For the other methods according to 5.2.2.2.1, the relevant classification criteria shall be used. The same classification level shall
be reached.
d
For DRF Class EXT, the Durability of Reaction to Fire performance classification is only valid for the type of coating system
(with an ordinary paint) to be verified.
e
Verification of DRF Class EXT obtained without 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.

10

---------------------- Page: 12 ----------------------

SIST CEN/TS 15912:2012
CEN/TS 15912:2012 (E)
6 Practices to use the DRF classification system
 DRF INT1 and INT2 classifications apply for the life time of the wood product provided the product is only
used in the intended service class;
 DRF Class EXT is complex with a number of factors to be considered. The manufacturers should be
consulted regarding service life;
 Manufacturers of fire-retardant wood-based products with DRF classification shall use a third party
production control system according to Attestation of Conformity system 1;
 Systems in the relevant product standards for CE-marking may preferably be used, since they include
high attestation of conformity levels for fire-retardant treated wood products;
 Documentation shall include instructions on maintenance frequency and methods according to 5.1;
 Products approved with a DRF class ST, INT1, INT2 or EXT, should be individually marked with DRF
Class symbols (see below) unless for aesthetic reasons this is not practical and with DRF Class,
producer’s name, name of fire-retardant product or trade name on the package label;
 Year of initial testing in the symbol, or beside, may be used, see Figure 2.

Figure 2 — Proposed labels to be used for DRF classes ST, INT1, INT2 and EXT with year of initial
testing
7 Classification report
Classification report according to this document shall be issued by accredited institutes and approval bodies.
The classification report shall include the following items:
 Name and address of the national institute or approval body;
 Name and address of the organisation or person stating the classification;
 Name and address of the manufacturer or supplier of the product;
 Identification of the wood-based product including type of fire-retardant treatment, retention level and
coating details;
 A general description of the product including density and thickness;
 Initial reaction to fire class obtained according to e.g. EN 13501-1 or IMO Code FTP, incl. details on
mounting and fixing;
 Identification and number of the test reports referred to;
 Accelerated weathering method used for DRF Class EXT;
 Information if any maintenance has to be performed during use;
11

---------------------- Page: 13 ----------------------

SIST CEN/TS 15912:2012
CEN/TS 15912:2012 (E)
 Hygroscopicity and weathering tests, including test method employed;
 Performance according to the criteria for the actual DRF class;
 Reference to this Technical Specification and the fire classification standard used.
The format for a classification report is given in Annex B.
12

---------------------- Page: 14 ----------------------

SIST CEN/TS 15912:2012
CEN/TS 15912:2012 (E)
Annex A
(informative)

Test methods
A.1 Hygroscopic properties of fire-retardant treated wood-based products including
those with fire-retardant coatings
A.1.1 General
This test method prescribes the procedure for determining the equilibrium moisture content after exposure to
standard high relative humidity conditions of (70 ± 5) % at (25 ± 2)°C or (90 ± 5) % at (27 ± 2)°C, depending
on DRF class. The method is based on NT Build 504 [6], with changes in A.1.3 and an additional humid
climate included for testing. It is a modified and extended version of ASTM D 3201-94 (with the same title) [7].
The extension aims at more repeatable and reproducible results by requiring conditioning to equilibrium
moisture content (instead of a specified time, one week, without specifying the sample size or air velocities in
the climate chamber in the ASTM version).
In this European Technical Specification, some further modifications are included, mainly testing for two
interior cases, dry and humid.
A.1.2 Field of application
 The method is applicable for assessing the hygroscopic properties of fire-retardant treated solid wood and
wood-based products (with the fire-retardant incorporated during the manufacturing of the wood-based
product). It is also applicable for wood products with fire-retardant coatings, including film-forming, no
...