EN 599-1:2009/FprA1

Durability of wood and wood-based products - Efficacy of preventive wood preservatives as determined by biological tests - Part 1: Specification according to use class

This part of EN 599 specifies for each of the five use classes defined in EN 335-1, the biological tests required for evaluating the efficacy of wood preservatives for the preventive treatment of solid timber, together with the minimum ageing tests required for the respective use class. It provides the method for calculating the critical value of a preservative. The critical value is the value that shall be used to calculate the recommended retention of the preservative appropriate for specific service conditions. The critical value is not necessarily the recommended retention or the minimum retention level for the preservative. The wide range of hazards, exposure conditions and service life requirements across Europe make it necessary to allow for local considerations in the calculation of the required preservative retention; EN 351-1 provides for the critical value to be adjusted to take account of these factors.
This part of EN 599 is applicable to all wood preservative products supplied for application in liquid form for the preventive treatment of timbers (structural and non-structural) against wood-attacking fungi, woodattacking insects and marine borers as described in EN 335-1. However, it is applicable to products for preventive treatments against fungi causing disfigurement (blue stain) of wood in service if this forms part of the overall preventive efficacy of the product.
This part of EN 599 does not necessarily take into account all the factors which may affect the stability of active ingredients in preservative treated wood. These factors include ultra-violet light and microbiological agencies capable of degrading components of the preservative. Such factors are an integral part of exposure in field trials but are subject to natural variation and their impact is not directly assessed in the field trial methods included in this standard. Methods are in development to assess the impact of these factors but are not finalised and cannot be included in this revision of this part of EN 599. Because such factors could, in service, significantly affect the active ingredient’s suitability for its intended purpose, the manufacturer/ producer is expected to ensure and be able to provide evidence that its stability, at the recommended retention of the preservative product, has been adequately assessed.
This part of EN 599 is not applicable to wood preservative products supplied for application as pastes, solids or in capsule or gaseous form because these cannot be tested without modification of the biological tests cited in this standard. It does not apply either to wood preservative products for remedial (curative) treatments, to those applied to prevent fungi causing sap stain on green (unseasoned) timber or to those applied solely to prevent fungi causing disfigurement (blue stain) of wood in service.
NOTE 1 The nature of the laboratory and field tests required in this part of EN 599 to demonstrate efficacy of a wood preservative are such that the time required generating the data is many months or years, depending upon the properties of the wood preservative and the use class in which the treated wood is to be exposed.
For preservative products which have already been placed on the market without significant formulation variation (see Annex A) before the end of 1990 and which can demonstrate a record of having been used lawfully and successfully in accordance with local technical traditions during this period, national standards bodies or independent authorities nominated by them, may declare critical values for use within their territories.
NOTE 2 For re-testing after making variations in product formulation, guidance is given in Annex A.

Dauerhaftigkeit von Holz und Holzprodukten - Wirksamkeit von Holzschutzmitteln wie sie durch biologische Prüfungen ermittelt wird - Teil 1: Spezifikation entsprechend der Gebrauchsklasse

Durabilité du bois et des matériaux dérivés du bois - Efficacité des produits préventifs de préservation du bois établie par des essais biologiques - Partie 1: Spécification par classe d'emploi

Trajnost lesa in lesnih proizvodov - Lastnosti preventivnih zaščitnih sredstev za les, določene z biološkimi testi - 1. del: Zahteve glede na razrede izpostavitve

General Information

• Status: Not Published
• ICS: 71.100.50 - Wood-protecting chemicals
• Technical Committee: CEN/TC 38 - Durability of wood and derived materials
• Drafting Committee: CEN/TC 38/WG 22 - Performance - Assessment and specifications (treated wood - Wood preservatives)
• Current Stage: 5060 - Closure of Vote - Formal Approval
• Start Date: 20-Sep-2013
• Due Date: 16-Apr-2014
• Completion Date: 20-Sep-2013
• Ref Project: SIST EN 599-1:2009/kFprA1:2013 - Durability of wood and wood-based products - Efficacy of preventive wood preservatives as determined by biological tests - Part 1: Specification according to use class

Relations

• Merged Into: EN 599-1:2009+A1:2013 - Durability of wood and wood-based products - Efficacy of preventive wood preservatives as determined by biological tests - Part 1: Specification according to use class
• Effective Date: 19-Jan-2023
• Amends: EN 599-1:2009 - Durability of wood and wood-based products - Efficacy of preventive wood preservatives as determined by biological tests - Part 1: Specification according to use class
• Effective Date: 05-Feb-2011

Overview

EN 599-1:2009/FprA1 is a European standard developed by CEN that specifies requirements for assessing the efficacy of preventive wood preservatives through biological testing. It focuses on solid timber treatment across the five use classes defined in EN 335-1. The standard guides how to conduct biological tests and minimum ageing tests to determine the critical value of wood preservatives-the key parameter used to calculate the recommended preservative retention for specific service conditions. The standard is applicable to liquid-form wood preservative products used for preventive treatment of both structural and non-structural wood against decay fungi, wood-attacking insects, and marine borers. It excludes products in paste, solid, capsule, or gaseous forms and those intended for curative or remedial treatments.

Key Topics

• Use Class Specification
  EN 599-1:2009/FprA1 aligns biological testing and ageing procedures with each of the five use classes defined in EN 335-1, ensuring preservative efficacy is assessed in context of specific service environments.

• Biological Testing Methods
  Standardized laboratory and field biological tests evaluate preservative performance against wood-decaying fungi and wood-boring insects. These tests are essential in establishing critical values for product retention.

• Critical Value Determination
  The critical value is calculated based on test outcomes and represents a baseline used to recommend preservative retention levels. This value accounts for local hazards and conditions, and can be adjusted according to guidance in EN 351-1.

• Ageing Procedures
  EN 599-1 includes requirements for minimum artificial or natural ageing protocols to simulate environmental exposure, including cold, UV light, and microbiological degradation, though some factors impacting stability remain under development for future inclusion.

• Product Stability and Manufacturer Responsibility
  While the standard does not fully address all mechanisms influencing active ingredient degradation, manufacturers must provide evidence supporting the stability and effectiveness of their preservatives at recommended retention levels.

• Modifications and Updates
  The amendment FprA1 adjusts normative references, refines efficacy criteria in biological tests for different use classes, clarifies production control tolerances for active ingredients, and includes updates to artificial ageing procedures.

Applications

• Wood Preservation Industry
  This standard is crucial for manufacturers formulating and marketing liquid wood preservatives, helping establish reliable efficacy benchmarks that comply with European harmonized testing.

• Timber Treatment and Construction
  EN 599-1 informs treatment protocols for wood used in various construction sectors, ensuring long-term durability and resistance to biological attack compliant with safety and quality standards.

• Quality Assurance and Certification
  Producers and testing laboratories utilize the standard to verify preservative performance, supporting product certification, regulatory approval, and market acceptance across Europe.

• Research and Development
  The guidelines aid R&D teams in evaluating new preservative formulations under realistic biological threat scenarios per use class, facilitating innovation in wood protection technologies.

Related Standards

• EN 335-1 – Defines the five use classes for wood based on service conditions, providing the context for testing and application considerations within EN 599-1.

• EN 351-1 – Offers methodologies to adjust critical values from EN 599-1 accounting for local environmental hazards and exposure risks.

• EN 73 – Specifies ageing procedures that simulate the environmental impact prior to biological efficacy testing, referenced within EN 599-1 amendments.

• EN 152 – Laboratory method for assessing the protective effectiveness of preservatives against blue stain fungi, closely linked with updates in EN 599-1.

• EN 351-1 – Provides methods to adapt preservative retention calculations considering regional and situational factors influencing wood durability.

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Keywords: wood durability, wood preservatives, biological tests, preventive treatment, critical value, use class, EN 599-1, wood protection, timber treatment, wood decay resistance, CEN standard, preservative retention, wood protection standard Europe

Standards Content (Sample)

SLOVENSKI STANDARD
01-september-2013
7UDMQRVWOHVDLQOHVQLKSURL]YRGRY/DVWQRVWLSUHYHQWLYQLK]DãþLWQLKVUHGVWHY]D
OHVGRORþHQH]ELRORãNLPLWHVWLGHO=DKWHYHJOHGHQDUD]UHGHL]SRVWDYLWYH
Durability of wood and wood-based products - Efficacy of preventive wood preservatives
as determined by biological tests - Part 1: Specification according to use class
Dauerhaftigkeit von Holz und Holzprodukten - Wirksamkeit von Holzschutzmitteln wie sie
durch biologische Prüfungen ermittelt wird - Teil 1: Spezifikation entsprechend der
Gebrauchsklasse
Durabilité du bois et des matériaux dérivés du bois - Efficacité des produits préventifs de
préservation du bois établie par des essais biologiques - Partie 1: Spécification par
classe d'emploi
Ta slovenski standard je istoveten z: EN 599-1:2009/FprA1
ICS:
71.100.50 .HPLNDOLMH]D]DãþLWROHVD Wood-protecting chemicals
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD
FINAL DRAFT
EN 599-1:2009
NORME EUROPÉENNE
EUROPÄISCHE NORM
FprA1
June 2013
ICS 71.100.50
English Version
Durability of wood and wood-based products - Efficacy of
preventive wood preservatives as determined by biological tests
- Part 1: Specification according to use class
Durabilité du bois et des matériaux dérivés du bois - Dauerhaftigkeit von Holz und Holzprodukten - Wirksamkeit
Efficacité des produits préventifs de préservation du bois von Holzschutzmitteln wie sie durch biologische Prüfungen
établie par des essais biologiques - Partie 1: Spécification ermittelt wird - Teil 1: Spezifikation entsprechend der
par classe d'emploi Gebrauchsklasse
This draft amendment is submitted to CEN members for unique acceptance procedure. It has been drawn up by the Technical Committee
CEN/TC 38.
This draft amendment A1, if approved, will modify the European Standard EN 599-1:2009. If this draft becomes an amendment, CEN
members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for inclusion of this amendment
into the relevant national standard without any alteration.

This draft amendment was established by CEN 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.
Recipients of this draft are invited to submit, with their comments, notification of any relevant patent rights of which they are aware and to
provide supporting documentation.

Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without notice and
shall not be referred to as a European Standard.

EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2013 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 599-1:2009/FprA1:2013: E
worldwide for CEN national Members.

Contents Page
Foreword . 3
1. Modification to Clause 2, Normative references . 4
2. Modification to 5.2.14 .
...