Thermal Modified Timber - Definitions and characteristics

La présente Spécification technique donne les définitions et les caractéristiques relatives au bois modifié thermiquement. Le bois modifié thermiquement est utilisé dans des milieux intérieurs (secs, humides) et extérieurs. NOTE 1 Le bois modifié thermiquement est généralement un produit semi-fini dont les applications sont, par exemple, les planchers, les lambris, les bardages, les platelages, les fenêtres, les portes, le mobilier et autre menuiserie intérieure et extérieure. Les normes de produits spécifient les exigences et les méthodes d’essai devant être prises en compte. NOTE 2 Utilisation dans des applications porteuses – il convient de se référer aux normes EN pertinentes.

Thermisch modifiziertes Holz - Definitionen und Eigenschaften

Diese Technische Spezifikation legt die Definitionen und die Eigenschaften von thermisch modifiziertem Holz (en: Thermally Modified Timber, TMT)  fest. Thermisch modifiziertes Holz wird in Innenräumen (Trocken, Feuchtbereich) und im Außenbereich eingesetzt.
ANMERKUNG 1   Thermisch modifiziertes Holz ist üblicherweise ein Halbfertigprodukt, das für folgende Anwendungsfälle eingesetzt wird: z. B. Fußböden, Innenbekleidungen, Außenbekleidungen, Deckbeläge, Fenster, Türen, Möbel und andere Holzbauteile im Innen- und Außenbereich. Die entsprechenden Produktnormen enthalten Anforderungen und Prüf¬verfahren, die zu berücksichtigen sind.
ANMERKUNG 2   Für die Verwendung in last tragenden Konstruktionen sollte auf die zutreffenden EN Normen verwiesen werden.

Bois Modifié Thermiquement - Définitions et caractéristiques

La présente Spécification technique donne les définitions et les caractéristiques relatives au bois modifié thermiquement. Le bois modifié thermiquement est utilisé dans des milieux intérieurs (secs, humides) et extérieurs.
NOTE 1   Le bois modifié thermiquement est généralement un produit semi-fini dont les applications sont, par exemple, les planchers, les lambris, les bardages, les platelages, les fenêtres, les portes, le mobilier et autre menuiserie intérieure et extérieure. Les normes de produits spécifient les exigences et les méthodes d’essai devant être prises en compte.
NOTE 2   Utilisation dans des applications porteuses  il convient de se référer aux normes EN pertinentes.

Toplotno obdelan les - Definicije in lastnosti

General Information

Status
Published
Publication Date
27-Nov-2007
Current Stage
9093 - Decision to confirm - Review Enquiry
Completion Date
09-Jun-2010

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SLOVENSKI STANDARD
SIST-TS CEN/TS 15679:2008
01-april-2008
Toplotno obdelan les - Definicije in lastnosti
Thermal Modified Timber - Definitions and characteristics
Thermisch modifiziertes Holz - Definitionen und Eigenschaften
Bois modifié thermiquement - Définitions et caractéristiques
Ta slovenski standard je istoveten z: CEN/TS 15679:2007
ICS:
01.040.79
79.040
SIST-TS CEN/TS 15679:2008 en,fr,de

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

---------------------- Page: 1 ----------------------
TECHNICAL SPECIFICATION
CEN/TS 15679
SPÉCIFICATION TECHNIQUE
TECHNISCHE SPEZIFIKATION
November 2007
ICS 01.040.79; 79.040
English Version
Thermal Modified Timber - Definitions and characteristics

Bois Modifié Thermiquement - Définitions et Thermisch modifiziertes Holz - Definitionen und

caractéristiques Eigenschaften

This Technical Specification (CEN/TS) was approved by CEN on 15 November 2007 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, 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 and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre: rue de Stassart, 36 B-1050 Brussels

© 2007 CEN All rights of exploitation in any form and by any means reserved Ref. No. CEN/TS 15679:2007: E

worldwide for CEN national Members.
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CEN/TS 15679:2007 (E)
Contents Page

Foreword..............................................................................................................................................................3

Introduction .........................................................................................................................................................4

1 Scope......................................................................................................................................................5

2 Normative references............................................................................................................................5

3 Terms and definitions ...........................................................................................................................7

4 Symbols and abbreviations ..................................................................................................................8

5 Characteristics.......................................................................................................................................8

5.1 General....................................................................................................................................................8

5.2 Equilibrium moisture content.............................................................................................................10

5.3 Dimensional stability...........................................................................................................................10

5.4 Durability : resistance to attack by fungi ..........................................................................................10

5.5 Density..................................................................................................................................................11

5.6 Mechanical properties.........................................................................................................................11

5.6.1 Bending strength and modulus of elasticity.....................................................................................11

5.6.2 Impact strength....................................................................................................................................11

5.6.3 Surface hardness.................................................................................................................................11

5.6.4 Tension perpendicular to grain..........................................................................................................11

5.6.5 Compression strength........................................................................................................................12

5.6.6 Strength of mechanical fasteners......................................................................................................12

5.7 Thermal conductivity...........................................................................................................................12

5.8 Adhesive bonding of TMT...................................................................................................................12

5.9 Adhesion of coating to TMT ...............................................................................................................12

5.10 Emissions.............................................................................................................................................12

5.11 Reaction to fire.....................................................................................................................................12

5.12 Durability : resistance to attack by insects.......................................................................................12

5.13 Colour...................................................................................................................................................12

6 Assessment of characteristics...........................................................................................................13

6.1 General..................................................................................................................................................13

6.2 Sampling...............................................................................................................................................13

6.3 Factory production control.................................................................................................................13

6.3.1 General..................................................................................................................................................13

6.3.2 Characteristics of the TMT product to be controlled.......................................................................14

7 Marking.................................................................................................................................................15

Annex A (informative) Examples of characteristics ......................................................................................16

A.1 Equilibrium moisture content.............................................................................................................16

A.2 Dimensional stability...........................................................................................................................16

A.3 Biological durability............................................................................................................................17

Bibliography ......................................................................................................................................................18

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CEN/TS 15679:2007 (E)
Foreword

This document (CEN/TS 15679:2007) 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 organizations of the following

countries are bound to announce this Technical Specification: Austria, Belgium, Bulgaria, 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 and the United Kingdom.
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CEN/TS 15679:2007 (E)
Introduction

The principal changes on thermal modification of timber - compared with untreated wood – are improved

dimensional stability and increased resistance to decay by wood destroying fungi, and in some cases changed

colours..

Due to the treatment, equilibrium moisture content of thermally modified timber is reduced.

Because of altered strength properties comparing to untreated wood, for the use of TMT, it is essential that

the relevant requirements of European and national Standards be taken into consideration.

Thermal modification may have an influence on reaction to fire properties of timber.

The properties of thermally modified timber and the degree that the property changes is dependent of the

wood species, the type of technology and the process parameters, particularly the treatment temperature

level.

The altering of acoustic properties can be of interest particularly for musical instruments.

Some tests have shown an increased resistance of TMT against some insects. Improved resistance against

termites has not been proved. Requirements on resistance against termites in some EU member states are to

be taken into consideration.

The technologies for manufacturing thermally modified timber are mainly characterized by the way they

reduce the oxygen concentration during treatment. The currently applied, industrial scale processes are using

atmospheres of heated air and or steam or heated nitrogen or in a bath of heated oil.

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CEN/TS 15679:2007 (E)
1 Scope

This Technical Specification gives definitions and characteristics for Thermally Modified Timber. TMT is used

in interior (dry, humid) and exterior conditions.

NOTE 1 TMT is usually a semi-finished product; applications are e.g. flooring, panelling, cladding, decking, windows,

doors, furniture and other internal and external joinery. Where product standard exist, the given requirements and test

methods are to be taken into consideration.

NOTE 2 Use in load bearing applications – reference to relevant EN standards should be made.

2 Normative references

The following referenced documents are indispensable for the application of this document. For dated

references, only the edition cited applies. For undated references, the latest edition of the referenced

document (including any amendments) applies.

EN 20-2, Wood preservative – Determination of the protective effectiveness against Lyctus brunneus

(Stephens) – Part 2: Application by impregnation (Laboratory method)

EN 47, Wood preservatives – Determination of the toxic values against larvae of Hylotrupes bajulus

(Linnaeus) – (Laboratory method)

EN 84, Wood preservatives – Accelerated ageing of treated wood prior to biological testing – Leaching

procedure

EN 113, Wood preservatives – Test method for determining the protective effectiveness against wood

destroying basidiomycetes – Determination of the toxic values

EN 117, Wood preservatives – Determination of toxic values against Reticulitermes species (European

termites) (Laboratory method)

EN 204, Classification of thermoplastic wood adhesives for non-structural applications

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

EN 301, Adhesives, phenolic and aminoplastic, for load-bearing timber structures – Classification and

performance requirements

EN 335-1, Durability of wood and wood-based products – Definition of use classes – Part 1: General

EN 335-2, Durability of wood and wood-based products – Definition of use classes – Part 2 : Application to

solid wood,

EN 350-1, Durability of wood and wood-based products – Natural durability of solid wood – Part 1: Guide to

the principles of testing and classification of the natural durability of wood

EN 383, Timber Structures – Test methods – Determination of embedment strength and foundation values for

dowel type fasteners

EN 408, Timber structures – Structural timber and glued laminated timber – Determination of some physical

and mechanical properties
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CEN/TS 15679:2007 (E)

EN 460, Durability of wood and wood-based products – Natural durability of solid wood – Guide to the

durability requirements for wood to be used in hazard classes

ENV 807, Wood preservatives – Determination of the effectiveness against soft rotting micro-fungi and other

soil inhabiting micro-organisms

prCEN/TS 839, Wood preservatives – Determination of the protective effectiveness against wood destroying

basidiomycetes - Application by surface treatment.

EN 844-1, Round and sawn timber – Terminology – Part 1 : General terms common to round timber and sawn

timber

EN 844-2, Round and sawn timber – Terminology – Part 2 : General terms relating to round timber

EN 844-3, Round and sawn timber – Terminology – Part 3 : General terms relating to sawn timber

EN 844-4, Round and sawn timber – Terminology – Part 4 : Terms relating to moisture content

EN 844-5, Round and sawn timber – Terminology – Part 5 : Terms relating to dimensions of round timber

EN 844-6, Round and sawn timber – Terminology – Part 6 : Terms relating to dimensions of sawn timber

EN 844-7 Round and sawn timber – Terminology – Part 7: Terms relating to anatomical structure of timber

EN 844-8, Round and sawn timber – Terminology – Part 8 : Terms relating to features of round timber

EN 844-9, Round and sawn timber – Terminology – Part 9 : Terms relating to features of sawn timber

EN 844-10, Round and sawn timber – Terminology – Part 10 : Terms relating to stain and fungal attack

EN 844-11, Round and sawn timber – Terminology – Part 11 : Terms relating to degrade by insects

EN 844-12, Round and sawn timber – Terminology – Part 12 : Additional terms and general index

EN 927-6, Paints and varnishes - Coating materials and coating systems for exterior wood – Part 6 : Exposure

of wood coatings to artificial weathering using fluoresdent UV lamps and water

EN 1001-2, Durability of wood and wood based products – Terminology - Part 2: Vocabulary

EN 1380, Timber structures – Test methods – Load bearing nailed joints

EN 1382, Timber structures – Test methods – Withdrawal capacity of timber fasteners

EN 1534, Wood and parquet flooring – Determination of resistance to indentation (Brinell) – Test method

EN 1910, Wood and parquet flooring and wood panelling and cladding – Determination of dimensional stability

EN 1995-1-1, Eurocode 5: Design of timber structures – Part 1-1: General – Common rules and rules for

buildings

CEN/TS 12037, Wood preservatives – Field test method for determining the relative protective effectiveness

of a wood preservative exposed out of ground contact – Horizontal lap-joint method

ENV 12169, Criteria for the assessment of conformity of a lot of sawn timber

EN 12524, Building materials and products – Hygrothermal properties – Tabulated design values

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CEN/TS 15679:2007 (E)

EN 12664, Thermal performance of building materials and products - Determination of thermal resistance by

means of guarded hot plate and heat flow meter methods - Dry and moist products of medium and low

thermal resistance

EN 13183-1, Moisture content of a piece of sawn timber - Part 1: Determination by oven dry method

EN 13501-1, Fire classification of construction products and building 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
EN 14762, Wood flooring, Sampling procedures for evaluation of conformity

prCEN/TS 15397, Wood preservatives – Method for natural preconditioning out of ground contact of treated

wood specimens prior to biological laboratory test

EN 20105-A03, Textiles - Tests for colour fastness - Part A03: Grey scale for assessing staining (ISO 105-

A03:1993)

EN ISO 179-1, Plastics - Determination of Charpy impact properties - Part 1: Non-instrumented impact test

(ISO 179- 1:2000)
EN ISO 2409, Paints and varnishes - Cross-cut test (ISO 2409:1992)
EN ISO 4624, Paints and varnishes – Pulloff test for ahesion (ISO 4624: 2002)

EN ISO 9239-1, Reaction to fire tests for floorings – Part 1 : Determination of the burning behaviour using a

radiant heat source (ISO 9239-1:2002)

EN ISO 16000-9, Indoor air – Part 9 : Determination of the emission of volatile organic compounds from

building products and furnishing – Emission test chamber method (ISO 16000-9:2006)

ISO 7724-1, Paints and varnishes -- Colorimetry -- Part 1: Principles
ISO 7724-2, Paints and varnishes -- Colorimetry – Part 2 : Colour measurement

ISO 7724-3, Paints and varnishes -- Colorimetry – Part 3 : Calculation of colour differences

3 Terms and definitions

For the purposes of this document, the terms and definitions given in EN 844 part 1 to part 12 and in EN

1001-2:2005 and the following apply.
3.1
thermally modified timber

Wood at which the composition of the cell wall material and its physical properties are modified by the

exposure of temperature higher than 160 ºC and conditions of reduced oxygen availability. The wood is

altered in such way that at least some of the wood properties are permanently affected through the cross

section of the timber
3.2
dry conditi
...

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