CEN/TS 16818:2018
(Main)Durability of wood and wood-based products - Moisture dynamics of wood and wood-based products
Durability of wood and wood-based products - Moisture dynamics of wood and wood-based products
This document details a method for determining the water uptake and the effectiveness of the drying process on solid wood, wood-based materials or coated wood by means of water absorption and water vapour desorption. This document lays down a method to assess the moisture dynamics of wooden products which can be a contributing factor to the susceptibility to wood decay.
Dauerhaftigkeit von Holz und Holzprodukten - Feuchte-Dynamik von Holz und Holzprodukten
Dieses Dokument beschreibt ein Verfahren zur Bestimmung des Wasseraufnahmevermögens und der Effektivität des Trocknungsprozesses bei Vollholz, Holzprodukten oder beschichtetem Holz durch Wasser-aufnahme und Wasserdampfabgabe. Darüber hinaus legt dieses Dokument ein Verfahren zur Beurteilung der Feuchte-Dynamik von Holzprodukten fest, die einen Einfluss auf die Anfälligkeit gegenüber Holzfäule haben kann.
Durabilité du bois et des matériaux à base de bois - Cinétique d'humidification du bois et des produits à base de bois
La présente Norme européenne définit une méthode pour la détermination de l'absorption d'eau et de l'efficacité du processus de séchage du bois massif, des matériaux à base de bois ou du bois revêtu par des essais d'absorption d'eau et de désorption de vapeur d'eau. Cette Norme européenne fixe une méthode d'évaluation de la cinétique d'humidification des produits en bois, et indirectement de leur sensibilité à la pourriture.
Trajnost lesa in lesnih izdelkov - Dinamika vlaženja lesa in lesnih izdelkov
Ta evropski standard določa metodo za ugotavljanje vpijanje vode in učinkovitosti procesa sušenja trdnega lesa, lesnih materialov ali prevlečenega lesa na podlagi absorpcije vode in desorpcije vodnih hlapov. Ta evropski standard podaja metodo za ocenjevanje dinamike vlage v lesnih izdelkih in posredno njihovo dovzetnost za lesno gnilobo.
General Information
Overview
CEN/TS 16818:2018 - Durability of wood and wood-based products: Moisture dynamics of wood and wood-based products specifies a laboratory method to quantify water uptake and drying behaviour of solid wood, wood-based panels and coated wood. The test measures water absorption and water vapour desorption to assess moisture dynamics that contribute to susceptibility to fungal decay. The method helps evaluate drying effectiveness, residual moisture and early wetting behaviour under controlled conditions.
Key topics and technical requirements
- Test principle: Repeated wetting (absorption) and drying (desorption) cycles with mass measurements to determine moisture uptake and release.
- Specimen preparation: Planed strips free of defects; quarter-sawn timber recommended. Typical sizes:
- Floating test: 50 × 50 × 25 mm (or panel thickness)
- Submersion test: 150 × 50 × 25 mm (or panel thickness)
- Sealing: End grain and edges sealed (e.g., two-pack polyurethane) to prevent end-grain penetration; faces left uncoated.
- Conditioning: Specimens conditioned at (20 ± 2) °C and (65 ± 5) % RH to constant mass before testing.
- Absorption methods:
- Floating test - sample rests on the water surface with lower face submerged.
- Submersion test - sample fully submerged.
- Measurement schedule: Mass readings at prescribed intervals (e.g., 1 h, 4 h, 8 h, 24 h, 48 h, 72 h, 144 h for absorption; desorption intervals up to 168 h).
- Short-term absorption: Separate early-phase wetting test (e.g., 5 s, 10 min, 1 h, 4 h, 8 h).
- Final oven-dry mass: Dry at (103 ± 2) °C to constant mass to determine oven-dry reference.
- Derived values: Absorption coefficient (slope vs. square root of time), residual moisture and residual moisture increase - used to infer decay risk.
- Equipment & reagents: Analytical balance (0.01 g), conditioning room, demineralized water complying with EN ISO 3696, drying oven, desiccator.
Applications and users
This technical specification is intended for:
- Timber and wood-based product manufacturers and R&D teams assessing moisture uptake and drying performance.
- Coating and preservative developers validating barrier or treatment effectiveness.
- Quality control and accredited testing laboratories performing durability screening.
- Specifiers, architects and building product assessors evaluating moisture-related decay risk for end uses.
- Research groups studying fungal susceptibility and moisture-driven degradation mechanisms.
Practical uses include product development, comparative testing of treatments/coatings, failure analysis, warranty support and informing service-life assessments.
Related standards
- EN ISO 3696 - Water for analytical laboratory use (referenced for water quality)
- EN 13183-1 - Moisture content determination by oven dry method (referenced for oven-dry mass)
- Developed by CEN/TC 38 (Durability of wood and wood-based products)
Keywords: CEN/TS 16818:2018, moisture dynamics, water uptake, wood durability, absorption coefficient, residual moisture, floating test, submersion test, wood decay susceptibility.
Standards Content (Sample)
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Trajnost lesa in lesnih izdelkov - Dinamika vlaženja lesa in lesnih izdelkovDauerhaftigkeit von Holz und Holzprodukten - Feuchte-Dynamik von Holz und HolzproduktenDurabilité du bois et des matériaux à base de bois - Cinétique d'humidification du bois et des produits à base de boisDurability of wood and wood-based products - Moisture dynamics of wood and wood-based products79.080Polizdelki iz lesaSemi-manufactures of timber79.040Les, hlodovina in žagan lesWood, sawlogs and sawn timberICS:Ta slovenski standard je istoveten z:CEN/TS 16818:2018SIST EN 16818:2018en,fr,de01-december-2018SIST EN 16818:2018SLOVENSKI
STANDARD
TECHNICAL SPECIFICATION SPÉCIFICATION TECHNIQUE TECHNISCHE SPEZIFIKATION
CEN/TS 16818
August
t r s z ICS
y {ä r z r English Version
Durability of wood and woodæbased products æ Moisture dynamics of wood and woodæbased products Durabilité du bois et des matériaux à base de bois æ Cinétique d 5humidification du bois et des produits à base de bois
Dauerhaftigkeit von Holz und Holzprodukten æ FeuchteæDynamik von Holz und Holzprodukten March
t r s z for provisional applicationä
hree yearsä After two years the members of CEN will be requested to
available promptly at national level in an appropriate formä It is permissible to keep conflicting national standards in force CEN members are the national standards bodies of Austriaá Belgiumá Bulgariaá Croatiaá Cyprusá Czech Republicá Denmarká Estoniaá Finlandá Former Yugoslav Republic of Macedoniaá Franceá Germanyá Greeceá Hungaryá Icelandá Irelandá Italyá Latviaá Lithuaniaá Luxembourgá Maltaá Netherlandsá Norwayá Polandá Portugalá Romaniaá Serbiaá Slovakiaá Sloveniaá Spainá Swedená Switzerlandá Turkey and United Kingdomä
EUROPEAN COMMITTEE FOR STANDARDIZATION COMITÉ EUROPÉEN DE NORMALISATION EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre:
Rue de la Science 23,
B-1040 Brussels
t r s z CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Membersä SIST EN 16818:2018
Production of treatment blocks . 13 Annex B (informative)
Example of a test report . 14 Bibliography . 15
— ISO Online browsing platform: available at http://www.iso.org/obp
3.1 supplier sponsor of the test (person or company providing the samples or wood-based products to be tested) 3.2 residue moisture content left in the test specimen after desorption as a percentage of the absorbed moisture 3.3 residual moisture content increase in moisture content in the test specimen after desorption 3.4 absorption coefficient slope of the fitted line for a plot of the water uptake per square metre against the square root of the elapsed time 3.5 treatment block wood or wood-based product that is subsequently edge and end grain sealed to create the test specimen SIST EN 16818:2018
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Frequently Asked Questions
CEN/TS 16818:2018 is a standard published by the European Committee for Standardization (CEN). Its full title is "Durability of wood and wood-based products - Moisture dynamics of wood and wood-based products". This standard covers: This document details a method for determining the water uptake and the effectiveness of the drying process on solid wood, wood-based materials or coated wood by means of water absorption and water vapour desorption. This document lays down a method to assess the moisture dynamics of wooden products which can be a contributing factor to the susceptibility to wood decay.
This document details a method for determining the water uptake and the effectiveness of the drying process on solid wood, wood-based materials or coated wood by means of water absorption and water vapour desorption. This document lays down a method to assess the moisture dynamics of wooden products which can be a contributing factor to the susceptibility to wood decay.
CEN/TS 16818:2018 is classified under the following ICS (International Classification for Standards) categories: 79.080 - Semi-manufactures of timber. The ICS classification helps identify the subject area and facilitates finding related standards.
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