SVENSK STANDARD SS-EN 350:2016

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SVENSK STANDARD

Fastställd/Approved: 2016-08-30 Publicerad/Published: 2016-09-06 Utgåva/Edition: 2

Språk/Language: engelska/English ICS: 79.040

SS-EN 350:2016

Trä och träbaserade produkters beständighet – Provning och klassificering av beständighet mot biologisk nedbrytning hos trä och träbaserade material

Durability of wood and wood-based products – Testing and classification of the durability to biological agents of wood and wood-based materials

This preview is downloaded from www.sis.se. Buy the entire This preview is downloaded from www.sis.se. Buy the entire This preview is downloaded from www.sis.se. Buy the entire This preview is downloaded from www.sis.se. Buy the entire standard via https://www.sis.se/std-8022170

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© Copyright SIS, Swedish Standards Institute, Stockholm, Sweden. All rights reserved. The use of this product is governed by the end-user licence for this product. You will find the licence in the end of this document.

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Europastandarden EN 350:2016 gäller som svensk standard. Detta dokument innehåller den officiella engelska versionen av EN 350:2016.

Denna standard ersätter SS-EN 350-1, utgåva 1 och SS-EN 350-2, utgåva 1.

The European Standard EN 350:2016 has the status of a Swedish Standard. This document contains the official English version of EN 350:2016.

This standard supersedes the Swedish Standard SS-EN 350-1, edition 1 and SS-EN 350-2, edition 1.

Denna standard är framtagen av kommittén för Beständighet, SIS / TK 182 / AG 3.

Har du synpunkter på innehållet i den här standarden, vill du delta i ett kommande revideringsarbete eller vara med och ta fram andra standarder inom området? Gå in på www.sis.se - där hittar du mer information.

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EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM

EN 350

August 2016

ICS 79.040 Supersedes EN 350-1:1994, EN 350-2:1994

English Version

Durability of wood and wood-based products - Testing and classification of the durability to biological agents of wood

and wood-based materials

Durabilité du bois et des matériaux dérivés du bois - Méthodes d'essai et de classification de la durabilité

vis-à-vis des agents biologiques du bois et des matériaux dérivés du bois

Dauerhaftigkeit von Holz und Holzprodukten - Prüfung und Klassifikation der Dauerhaftigkeit von Holz und

Holzprodukten gegen biologischen Angriff

This European Standard was approved by CEN on 18 June 2016.

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-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 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, Former Yugoslav Republic of Macedonia, 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 C O M I T É E UR O P É E N DE N O R M A L I SA T I O N E UR O P Ä I SC H E S KO M I T E E F ÜR N O R M UN G

CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels

worldwide for CEN national Members. Ref. No. EN 350:2016 E

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European foreword

This document (EN 350:2016) has been prepared by Technical Committee CEN/TC 38 “Durability of wood and wood-based products”, the secretariat of which is held by AFNOR.

This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by February 2017, and conflicting national standards shall be withdrawn at the latest by February 2017.

Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN shall not be held responsible for identifying any or all such patent rights.

This document supersedes EN 350-1:1994 and EN 350-2:1994.

Wood durability is an important factor that influences the service life of a wood product. This standard provides input to service life prediction of wood and wood-based products. It’s intended to give guidance on using wood products appropriate for different end-uses avoiding excessive requirements.

It also ranks durability against wood-decay organisms of various wood species thereby allowing species of appropriate durability to be selected for a particular use. It will however be emphasized that the biological durability rating of wood species given in Annex B cannot be regarded as any guarantee of performance in service.

There are many other factors influencing service life of a wood product, such as the principles of good design, use conditions, climate, maintenance which should be taken into consideration.

According to the CEN-CENELEC Internal Regulations, the national standards organisations of the following countries are bound to implement this European Standard: 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, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom.

SS-EN 350:2016 (E) This preview is downloaded from www.sis.se. Buy the entire standard via https://www.sis.se/std-8022170

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1 Scope

This European Standard gives guidance on methods for determining and classifying the durability of wood and wood-based materials against biological wood-destroying agents.

The methods can be applied either to individual wood species, batches of wood and processed wood- based materials, including heat-treated, preservative-treated wood and modified wood. However, this standard is not intended to replace testing of the efficacy of biocides.

The wood-destroying agents considered in this standard are:

— wood-decay fungi (basidiomycete and soft-rot fungi);

— beetles capable of attacking dry wood;

— termites;

— marine organisms capable of attacking wood in service.

Data on the biological durability of selected wood species considered of economic importance in European countries are presented in Annex B (informative), which also provides information relating to their geographical origin, density, sapwood width and treatability.

NOTE Treatability, durability to disfiguring fungi, permeability to water and performance in use of wood and wood-based materials are also important issues. However, because standardized methods aiming to assess and classify these factors do not exist and/or have not been extensively experienced yet, preliminary guidance is given in Annex C (informative) for the classification of wood treatability with aqueous wood preservatives, Annex D (informative) for the classification of the permeability to water, Annex E (informative) for the durability to disfiguring fungi, and Annex F (informative) for the classification of performance.

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 20-1, Wood preservatives - Determination of the protective effectiveness against Lyctus Brunneus (Stephens) - Part 1: Application by surface treatment (laboratory method)

EN 46−1, Wood preservatives - Determination of the preventive action against recently hatched larvae of Hylotrupes bajulus (Linnaeus) - Part 1: Application by surface treatment (laboratory method)

EN 49-1, Wood preservatives - Determination of the protective effectiveness against Anobium punctatum (De Geer) by egg-laying and larval survival - Part 1: Application by surface treatment (Laboratory method)

EN 117, Wood preservatives - Determination of toxic values against Reticulitermes species (European termites) (Laboratory method)

EN 252, Field test method for determining the relative protective effectiveness of a wood preservative in ground contact

EN 275, Wood preservatives - Determination of the protective effectiveness against marine borers

ENV 12038, Durability of wood and wood-based products - Wood-based panels - Method of test for determining the resistance against wood-destroying basidiomycetes

SS-EN 350:2016 (E)

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EN 13556, Round and sawn timber - Nomenclature of timbers used in Europe

CEN/TS 15083-1, Durability of wood and wood-based products - Determination of the natural durability of solid wood against wood-destroying fungi, test methods - Part 1: Basidiomycetes

CEN/TS 15083-2, Durability of wood and wood-based products - Determination of the natural durability of solid wood against wood-destroying fungi, test methods - Part 2: Soft rotting micro-fungi

EN 16449, Wood and wood-based products - Calculation of the biogenic carbon content of wood and conversion to carbon dioxide

ISO 13061-2, Physical and mechanical properties of wood — Test methods for small clear wood specimens — Part 2: Determination of density for physical and mechanical tests

3 Terms and definitions

For the purposes of this document, the following terms and definitions apply.

3.1 wood species

trade name according to EN 13556 which can on occasion include more than one botanical tree species Note 1 to entry: E.g. European oak which comprises both Quercus robur and Q. petraea.

3.2 pilot name for a wood species

result of a consensual choice due to practical considerations retaining the usual name under which the wood is the most widely commercialised, adopted either by the main exporting country or by the main importing country

Note 1 to entry: Pilot names are established since 1954 in the nomenclature of the ATIBT.

3.3 set

clearly identifiable collection of units of wood or wood-based products, originating from a commercial supply of a defined origin (single or not) and likely comprising only some of the variability of the wood species or of the wood-based material

Note 1 to entry: E.g. wood species sourced from a restricted geographical area.

3.4 wood-based material

any processed matrix containing and/or made of a specific percentage of wood

Note 1 to entry: Wood-based materials are those derived from trees and include amongst others heat-treated wood and any other material modified by chemical, physico-chemical or physical process, glue-laminated wood, wood-based panels, wood polymer composites and treated with wood preservatives. This standard is not meant to test all ligno-cellulosic materials (e.g. bamboo, reed, straw, flax) as such and would require methodological adaptions to do so.

SS-EN 350:2016 (E) This preview is downloaded from www.sis.se. Buy the entire standard via https://www.sis.se/std-8022170

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7 3.5 modified wood

wood that undergoes the action of a chemical, biological or physical agent, resulting in a permanent desired property enhancement

Note1 to entry: If the modification is intended for improved resistance to biological attack, then the mode of action is assumed to be non-biocidal.

3.6 durability to biological agents

inherent resistance of a wood species or a wood-based material against wood decay organisms

Note 1 to entry: This inherent resistance is due to the presence of natural components that can exhibit different levels of toxicity towards biological organisms and/or to anatomical particularities or a specific constitution of certain wood-based materials.

3.7 sapwood

outer zone of wood that, in the growing tree, contains living cells and conducts sap

Note 1 to entry: Depending on the species, age of the tree and the growing conditions the proportions of sapwood and heartwood can vary.

Note 2 to entry: Frequently paler than heartwood though not always distinguishable from heartwood in some wood species.

Note 3 to entry: Sapwood of all wood species is considered to be non-resistant against decay fungi unless other data are available. Sapwood can have different levels of resistance against wood boring insects (excluding termites).

3.8 heartwood

inner zone of wood that, in the growing tree, has ceased to contain living cells or to conduct sap

Note 1 to entry: Frequently darker than sapwood though not always distinguishable from sapwood in some wood species.

3.9 transition wood

wood in a zone between the sapwood and the heartwood

Note 1 to entry: The transition wood can be regarded as a region of the heartwood that has not fully matured.

This is only distinguishable in very few wood species. In general, its biological durability, treatability and permeability to water is intermediate between that of sapwood and heartwood.

3.10

juvenile wood

set of few growth rings of woody tissue nearest the centre of the tree, often having abnormal properties Note 1 to entry: Juvenile wood is a zone near to the pith, displaying marked ring to ring changes in its properties. There is no clear consensus as to where this zone ends. It is generally thought to end at 10 to 20 rings from the pith, but it depends on the wood species.

Note 2 to entry: The durability, permeability to water and treatability of juvenile wood can be different from that of mature heartwood.