EN 1966:2009
(Main)Structural adhesives - Characterization of a surface by measuring adhesion by means of the three point bending method
Structural adhesives - Characterization of a surface by measuring adhesion by means of the three point bending method
This European Standard describes a test method to determine ability of a cured adhesive (possibly with a primer) to adhere to a substrate which has had a certain surface finish or with a specific surface preparation by using the "three point bending method".
It is only used for quality assurance and the substrate should be rigid or resistant enough to bending such as steel or aluminium alloys. For other substrates the thickness should be adjusted to the modulus of elasticity or a suitable stiffener should be used.
The adhesive should be polymerisable (curable) without pressure in order to obtain the thickness needed to provide sufficient rigidity, otherwise, a bonded reinforcing piece of the same type and same thickness as the substrate can be substituted for the bloc of adhesive.
It is not suitable for film adhesives.
Strukturklebstoffe - Charakterisierung einer Oberfläche durch Messung der Adhäsion nach dem Dreipunkt -Biegeverfahren
Diese Europäische Norm beschreibt ein Prüfverfahren, bei dem das „Dreipunktbiegeverfahren“ angewendet wird zur Bestimmung der Fähigkeit eines vernetzten Klebstoffes (gegebenenfalls mit Primer) an einem Füge-werkstoff zu haften, der eine bestimmte Oberflächenbeschaffenheit hat oder eine spezielle Oberflächen-vorbehandlung erfahren hat.
Dieses Verfahren wird ausschließlich zur Qualitätssicherung angewandt und der Fügewerkstoff sollte starr oder gegen Biegen ausreichend widerstandsfähig sein, wie z. B. Stahl oder Aluminiumlegierungen. Bei anderen Fügewerkstoffen sollte die Dicke dem Elastizitätsmodul angepasst oder eine geeignete Versteifung angewendet werden.
Um eine Dicke zu erreichen, die eine ausreichende Steifigkeit ergibt, sollte der Klebstoff ohne Druck-anwendung polymerisierbar (vernetzbar) sein, andernfalls kann ein verstärkender Block der gleichen Art und der gleichen Dicke wie der Fügewerkstoff den Klebstoffblock ersetzen.
Das Verfahren gilt nicht für Klebstofffilme.
Adhésifs structuraux - Caractérisation d'une surface par mesure de l'adhérence au moyen de la méthode de la flexion en trois points
La présente Norme européenne décrit une méthode d’essai permettant de déterminer l’aptitude d’un adhésif
durci (éventuellement un système adhésif primaire) à adhérer à un substrat qui a subi un traitement de
surface spécifique ou possède un état de surface particulier, au moyen de la méthode dite « de flexion en
trois points ».
Cette méthode est utilisée uniquement dans le cadre de l’assurance qualité et il convient que le substrat soit
rigide ou suffisamment résistant à la flexion, comme l’acier ou les alliages d’aluminium. Concernant les autres
types de substrats, il convient que l’épaisseur soit adaptée selon le module d’élasticité ; il est également
possible d’utiliser un raidisseur adapté.
Il convient que l’adhésif soit polymérisable (durcissable) sans pression afin d’obtenir l’épaisseur nécessaire à
une rigidité suffisante. Dans le cas contraire, une pièce de renfort collée de même type et de même épaisseur
que le substrat peut remplacer le bloc d’adhésif.
Cette méthode ne convient pas aux adhésifs en film.
Konstrukcijska lepila - Opredelitev površine z merjenjem oprijema po metodi tritočkovnega upogiba
General Information
- Status
- Published
- Publication Date
- 10-Feb-2009
- Withdrawal Date
- 30-Aug-2009
- Technical Committee
- CEN/TC 193 - Adhesives
- Drafting Committee
- CEN/TC 193/WG 2 - Structural adhesives
- Current Stage
- 9093 - Decision to confirm - Review Enquiry
- Start Date
- 15-Jul-2025
- Completion Date
- 23-Sep-2025
Relations
- Effective Date
- 22-Dec-2008
Overview
EN 1966:2009 - published by CEN - specifies a laboratory test method to characterise a substrate surface by measuring adhesion of a cured structural adhesive using the three point bending method. The standard is intended for quality assurance of adhesive bonding to rigid substrates (e.g., steel, aluminium) and describes specimen preparation, test apparatus, test procedure, data extraction and required test report content.
Key topics and requirements
- Scope and limitations
- Applies to polymerisable (curable) adhesives that set without pressure; not suitable for film adhesives.
- Intended for rigid substrates or specimens stiffened to equivalent rigidity.
- Used for surface characterisation and quality control, not general design strength data.
- Specimen geometry
- Substrate: typically 50 × 10 × e mm (e depends on material and stiffness).
- Adhesive block moulded centrally: 25 × 5 × 4 mm (typical nominal dimensions in the standard).
- Substrates
- Typical materials: steel (e.g. XC18 or E24) 1 mm and aluminium alloy 2024 1.5 mm. Other materials are permitted if thickness or stiffening is adjusted to modulus of elasticity.
- Test apparatus and procedure
- Three point bending fixture with support pins 33 mm apart and a 12 mm central loading rod.
- Crosshead speed: (0.500 ± 0.001) mm/min.
- Force measurement accuracy: class A (±1%); displacement resolution 0.001 mm.
- Data and interpretation
- Record force/displacement curve; extract slope (P/d), maximum force (Pmax), maximum displacement (dmax), fracture initiation position, propagation mode and area between bonded and unbonded curves.
- If fracture initiates at the interface, results characterise adhesion; if within the adhesive block, results relate to cohesion.
- Reporting
- Test report must include adhesive identity and cure, surface preparation, substrate, conditioning/ageing, machine details, specimen dimensions and failure pattern (per EN ISO 10365).
Applications and users
- Useful for adhesive manufacturers, bonding process engineers, quality control laboratories and surface treatment specialists to:
- Evaluate effectiveness of surface preparation or primers.
- Compare adhesive performance on specific substrate finishes.
- Monitor production batches and supplier qualification.
- Not intended as a design load standard; best used in conjunction with joint-specific mechanical tests.
Related standards
- EN 923 - Adhesives: terms and definitions
- EN 13887 - Surface preparation guidelines for metals and plastics
- EN ISO 291 - Conditioning and testing atmospheres
- EN ISO 9142 - Ageing conditions for bonded joints
- EN ISO 10365 - Failure pattern designation
Keywords: EN 1966:2009, structural adhesives, three point bending method, adhesion testing, surface characterisation, CEN, quality assurance.
Frequently Asked Questions
EN 1966:2009 is a standard published by the European Committee for Standardization (CEN). Its full title is "Structural adhesives - Characterization of a surface by measuring adhesion by means of the three point bending method". This standard covers: This European Standard describes a test method to determine ability of a cured adhesive (possibly with a primer) to adhere to a substrate which has had a certain surface finish or with a specific surface preparation by using the "three point bending method". It is only used for quality assurance and the substrate should be rigid or resistant enough to bending such as steel or aluminium alloys. For other substrates the thickness should be adjusted to the modulus of elasticity or a suitable stiffener should be used. The adhesive should be polymerisable (curable) without pressure in order to obtain the thickness needed to provide sufficient rigidity, otherwise, a bonded reinforcing piece of the same type and same thickness as the substrate can be substituted for the bloc of adhesive. It is not suitable for film adhesives.
This European Standard describes a test method to determine ability of a cured adhesive (possibly with a primer) to adhere to a substrate which has had a certain surface finish or with a specific surface preparation by using the "three point bending method". It is only used for quality assurance and the substrate should be rigid or resistant enough to bending such as steel or aluminium alloys. For other substrates the thickness should be adjusted to the modulus of elasticity or a suitable stiffener should be used. The adhesive should be polymerisable (curable) without pressure in order to obtain the thickness needed to provide sufficient rigidity, otherwise, a bonded reinforcing piece of the same type and same thickness as the substrate can be substituted for the bloc of adhesive. It is not suitable for film adhesives.
EN 1966:2009 is classified under the following ICS (International Classification for Standards) categories: 83.180 - Adhesives. The ICS classification helps identify the subject area and facilitates finding related standards.
EN 1966:2009 has the following relationships with other standards: It is inter standard links to EN 1966:2002. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.
EN 1966:2009 is available in PDF format for immediate download after purchase. The document can be added to your cart and obtained through the secure checkout process. Digital delivery ensures instant access to the complete standard document.
Standards Content (Sample)
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Strukturklebstoffe - Charakterisierung einer Oberfläche durch Messung der Adhäsion nach dem Dreipunkt-BiegeverfahrenAdhésifs structuraux - Caractérisation d'une surface par mesure de l'adhérence au moyen de la méthode de la flexion en trois pointsStructural adhesives - Characterization of a surface by measuring adhesion by means of the three point bending method83.180LepilaAdhesivesICS:Ta slovenski standard je istoveten z:EN 1966:2009SIST EN 1966:2009en,fr,de01-maj-2009SIST EN 1966:2009SLOVENSKI
STANDARDSIST EN 1966:20031DGRPHãþD
EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN 1966February 2009ICS 83.180Supersedes EN 1966:2002
English VersionStructural adhesives - Characterization of a surface bymeasuring adhesion by means of the three point bendingmethodAdhésifs structuraux - Caractérisation d'une surface parmesure de l'adhérence au moyen de la méthode de laflexion en trois pointsStrukturklebstoffe - Charakterisierung einer Oberflächedurch Messung der Adhäsion nach dem Dreipunkt-BiegeverfahrenThis European Standard was approved by CEN on 27 December 2008.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this EuropeanStandard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such nationalstandards may be obtained on application to the CEN 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 translationunder the responsibility of a CEN member into its own language and notified to the CEN Management Centre has the same status as theofficial versions.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 STANDARDIZATIONCOMITÉ EUROPÉEN DE NORMALISATIONEUROPÄISCHES KOMITEE FÜR NORMUNGManagement Centre: rue de Stassart, 36
B-1050 Brussels© 2009 CENAll rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 1966:2009: ESIST EN 1966:2009
1 Scope This European Standard describes a test method to determine ability of a cured adhesive (possibly with a primer) to adhere to a substrate which has had a certain surface finish or with a specific surface preparation by using the "three point bending method". It is only used for quality assurance and the substrate should be rigid or resistant enough to bending such as steel or aluminium alloys. For other substrates the thickness should be adjusted to the modulus of elasticity or a suitable stiffener should be used. The adhesive should be polymerisable (curable) without pressure in order to obtain the thickness needed to provide sufficient rigidity, otherwise, a bonded reinforcing piece of the same type and same thickness as the substrate can be substituted for the bloc of adhesive. It is not suitable for film adhesives. 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 923:2005, Adhesives — Terms and definitions EN 10025-2, Hot rolled products of structural steels - Part 2: Technical delivery conditions for non-alloy structural steels EN 13887, Structural adhesives — Guidelines for surface preparation of metals and plastics prior to adhesive bonding EN ISO 291, Plastics — Standard atmospheres for conditioning
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