EN 1245:2011

Adhesives - Determination of pH

This European Standard specifies a method for the determination by electrometry of the pH of adhesives, their basic constituents and related products using a pH meter equipped with a glass and silver reference combined electrode.
This standard is applicable to products supplied in an aqueous medium, and of known concentration, and to products which can be dissolved, dispersed or suspended in water. It is not applicable to adhesives that react with water.
NOTE   The accuracy of the method decreases at pH values above 11.

Klebstoffe - Bestimmung des pH-Wertes

Diese Europäische Norm legt ein elektrometrisches Verfahren zur Bestimmung des pH-Wertes von Kleb-stoffen, ihrer Grundbestandteile und von verwandten Produkten mit einem pH-Messgerät fest, das mit einer kombinierten Glas- und Silberreferenzelektrode ausgestattet ist.
Diese Norm ist anwendbar bei Produkten, die in einem wässrigen Medium mit bekannter Konzentration geliefert werden, und bei Produkten, die in Wasser gelöst, dispergiert oder suspendiert werden können. Sie ist nicht anwendbar bei Klebstoffen, die mit Wasser reagieren.
ANMERKUNG Die Genauigkeit des Verfahrens nimmt bei pH-Werten über 11 ab.

Adhésifs - Détermination du pH

La présente Norme européenne spécifie une méthode de détermination électrométrique du pH des adhésifs, de leurs constituants de base et des produits connexes au moyen d'un pH-mètre muni d'une électrode de référence combinée en argent et en verre.
La présente norme s'applique aux produits présentés en milieu aqueux, et caractérisés par une concentration connue, ainsi qu'aux produits pouvant être mis en solution, dispersion ou suspension dans l'eau. Elle ne s'applique pas aux produits qui réagissent avec l'eau.
NOTE La précision de la méthode décroit pour des valeurs de pH supérieures à 11.

Lepila - Določevanje pH

Ta evropski standard določa metodo določevanja pH lepil, njihovih osnovnih sestavin in sorodnih proizvodov z elektrometrijo s pH-metrom, opremljenim s stekleno in srebrno referenčno kombinirano elektrodo.
Ta standard velja za proizvode, ki se dostavljajo v vodnem mediju in z znano koncentracijo, in za proizvode, ki se lahko raztopijo, razpršijo ali suspenirajo v vodi. Ne velja za lepila, ki reagirajo z vodo.
OPOMBA: Natančnost metode se niža pri pH vrednostih nad 11.

General Information

• Status: Published
• Publication Date: 19-Apr-2011
• Withdrawal Date: 30-Oct-2011
• ICS: 83.180 - Adhesives
• Technical Committee: CEN/TC 193 - Adhesives
• Drafting Committee: CEN/TC 193/WG 1 - General terminology - General physical and chemical tests
• Current Stage: 9093 - Decision to confirm - Review Enquiry
• Start Date: 12-Jul-2023
• Completion Date: 11-Feb-2026
• Ref Project: SIST EN 1245:2011 - Adhesives - Determination of pH

Relations

• Replaces: EN 1245:1998 - Adhesives - Determination of pH - Test method
• Effective Date: 13-Jun-2009
• Refers: EN ISO 15605:2004 - Adhesives - Sampling (ISO 15605:2000)
• Effective Date: 28-Jan-2026
• Refers: EN 1067:2005 - Adhesives - Examination and preparation of samples for testing
• Effective Date: 28-Jan-2026
• Refers: EN ISO 3696:1995 - Water for analytical laboratory use - Specification and test methods (ISO 3696:1987)
• Effective Date: 28-Jan-2026
• Refers: EN 923:2005+A1:2008 - Adhesives - Terms and definitions
• Effective Date: 28-Jan-2026
• Referred By: EN 301:2013 - Adhesives, phenolic and aminoplastic, for load-bearing timber structures - Classification and performance requirements
• Effective Date: 28-Jan-2026
• Referred By: EN 301:2023 - Adhesives, phenolic and aminoplastic, for load-bearing timber structures - Classification and performance requirements
• Effective Date: 28-Jan-2026
• Referred By: EN 301:2017 - Adhesives, phenolic and aminoplastic, for load-bearing timber structures - Classification and performance requirements
• Effective Date: 28-Jan-2026
• Referred By: EN 302-3:2017 - Adhesives for load-bearing timber structures - Test methods - Part 3: Determination of the effect of acid damage to wood fibres by temperature and humidity cycling on the transverse tensile strength
• Effective Date: 28-Jan-2026
• Referred By: EN 302-3:2023 - Adhesives for load-bearing timber structures - Test methods - Part 3: Determination of the effect of acid damage to wood fibres by temperature and humidity cycling on the transverse tensile strength
• Effective Date: 28-Jan-2026
• Referred By: EN 302-3:2013 - Adhesives for load-bearing timber structures - Test methods - Part 3: Determination of the effect of acid damage to wood fibres by temperature and humidity cycling on the transverse tensile strength
• Effective Date: 28-Jan-2026
• Referred By: EN 301:2006 - Adhesives, phenolic and aminoplastic, for load-bearing timber structures - Classification and performance requirements
• Effective Date: 28-Jan-2026

Overview

EN 1245:2011 - Adhesives: Determination of pH is a European Standard developed by CEN (European Committee for Standardization). This standard outlines a precise electrometric method for determining the pH of adhesives, their basic constituents, and related products using a pH meter equipped with a combined glass and silver reference electrode. EN 1245:2011 ensures consistent and accurate measurement of adhesive properties, which is critical for quality control in adhesive manufacturing and product development.

EN 1245:2011 applies specifically to adhesives supplied or prepared in an aqueous medium or those which can be dissolved, dispersed, or suspended in water. It is not applicable to adhesives that react with water, as such reactions would affect the accuracy and reliability of pH measurement.

Key Topics

• Scope and Applicability

  • Suitable for adhesives and related products in aqueous solutions of known concentrations.
  • Excludes adhesives that react with water.
  • Particularly relevant for laboratory and industrial quality control.

• pH Measurement Methodology

  • Utilizes a pH meter with a combined glass and silver reference electrode for accurate readings.
  • Emphasizes calibration using buffer solutions at known pH values (typically pH 4, 7, and 9).
  • Requires temperature control for precise measurement, usually at 23°C unless specified otherwise.

• Limitations

  • This method’s accuracy declines for pH values exceeding 11.

• Reporting Requirements

  • Test reports should record standard reference, sample identification, measured pH value and temperature, any modifications to procedure, and the date of testing.

Applications

EN 1245:2011 is integral to multiple stages of adhesive production and quality assurance:

• Product Development

  • Assesses the chemical stability and compatibility of new adhesive formulations.
  • Assists in optimizing performance for specific end-use environments by ensuring appropriate pH levels.

• Quality Control

  • Routine checks of incoming raw materials and final adhesive products.
  • Helps maintain consistent product performance and reliability by monitoring pH.

• Regulatory Compliance

  • Supports adherence to European and international requirements for adhesives.
  • Ensures accurate documentation for material safety and product traceability.

• Research and Testing Laboratories

  • Provides a standard method for comparative analysis and certification of adhesives in water-based systems.

Related Standards

EN 1245:2011 aligns with a range of European and international standards related to adhesives, laboratory testing, and analytical methodologies, including:

• EN 923 - Adhesives: Terms and definitions
• EN 1067 - Adhesives: Examination and preparation of samples for testing
• EN ISO 3696 - Water for analytical laboratory use: Specification and test methods
• EN ISO 15605 - Adhesives: Sampling

These standards collectively support consistent evaluation and reporting for adhesive products across the industry.

Practical Value

By following EN 1245:2011, organizations ensure reliable and standardized adhesive pH measurement. This supports the manufacturing of high-quality, consistent adhesive products and facilitates compliance with European regulations. Implementing this standard enhances confidence in product performance, simplifies international trade, and reduces variability in adhesive characterization across industries.

Keywords: EN 1245:2011, adhesive pH determination, CEN, pH meter, laboratory testing, adhesive quality control, aqueous adhesives, adhesive standards, electrometric pH measurement, adhesive manufacturing, European standards.

Standards Content (Sample)

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Klebstoffe - Bestimmung des pH-WertesAdhésifs - Détermination du pHAdhesives - Determination of pH83.180LepilaAdhesivesICS:Ta slovenski standard je istoveten z:EN 1245:2011SIST EN 1245:2011en,fr,de01-julij-2011SIST EN 1245:2011SLOVENSKI
STANDARDSIST EN 1245:20001DGRPHãþD

EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 1245
April 2011 ICS 83.180 Supersedes EN 1245:1998English Version
Adhesives - Determination of pH
Adhésifs - Détermination du pH
Klebstoffe - Bestimmung des pH-Wertes This European Standard was approved by CEN on 10 March 2011.
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, 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:
Avenue Marnix 17,
B-1000 Brussels © 2011 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 1245:2011: ESIST EN 1245:2011

2 Contents Page Foreword .31 Scope .42 Normative references .43 Terms and definitions .44 Principle .45 Apparatus .46 Reagents .57 Sampling .58 Procedure .69 Expression of results .710 Test report .7 SIST EN 1245:2011

3 Foreword This document (EN 1245:2011) has been prepared by Technical Committee CEN/TC 193 “Adhesives”, the secretariat of which is held by AENOR. 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 October 2011, and conflicting national standards shall be withdrawn at the latest by October 2011. 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. This document supersedes EN 1245:1998. The main modifications regarding the previous version are in the Title, Foreword, 8.4 and Normative References. SAFETY STATEMENT — Persons using this document should be familiar with the normal laboratory practice, if applicable. This document does not purport to address all of the safety problems, if any, associated with its use. It is the responsibility of the user to establish appropriate safety and health practices and to ensure compliance with any regulatory conditions. ENVIRONMENTAL STATEMENT — It is understood that some of the material permitted in this standard may have negative environmental impact. As technological advantages lead to acceptable alternatives for these materials, they will be eliminated from this standard to the extent possible. At the end of the test, the user of the standard should take care to carry out an appropriate disposal of the wastes, according to local regulation. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, 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.
4 1 Scope This European Standard specifies a method for the determination by electrometry of the pH of adhesives, their basic constituents and related products using a pH meter equipped with a glass and silver reference combined electrode. This standard is applicable to products supplied in an aqueous medium, and of known concentration, and to products which can be dissolved, dispersed or suspended in water. It is not applicable to adhesives that react with water. NOTE The accuracy of the method decreases at pH values above 11. 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+A1:2008, Adhesives
Terms and definitions EN 1067, Adhesives
Examination and preparation of samples for testing EN ISO 3696:1995, Water for analytical laboratory use
Specification and test methods (ISO 3696:1987) EN ISO 15605, Adhesives
Sampling (ISO 15605:2000) 3 Terms and definitions For the purposes of this document, the terms and definitions given in EN 923:2005+A1:2008 and the following apply. 3.1 pH log 1/[ H+] where [H+] is the hydrogen ion concentration of the test sample in moles per cubic decimetres (mol/dm3) 4 Principle Measurement of the potential difference existing between a glass electrode and a reference electrode immersed in the aqueous dispersion maintained at the specified test temperature, and reading of this difference expressed in pH units, directly on the pH meter scale. 5 Apparatus 5.1 pH meter, with input impedance of at least 1012 , a resolution of 0,01 pH unit, and equipped for temperature compensation. 5.2 Combined electrode, a glass electrode surrounded concentrically by a silver reference electrode. The reference electrolyte (6.3) is kept in electrical contact with the sample by a porous diaphragm. The glass electrode used shall be one recommended by the manufacturer as suitable over the
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