SIST 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
• Public Enquiry End Date: 24-Dec-2010
• Publication Date: 01-Jun-2011
• ICS: 83.180 - Adhesives
• Technical Committee: IPMA - Polimer materials and products
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 27-May-2011
• Due Date: 01-Aug-2011
• Completion Date: 02-Jun-2011
• Ref Project: EN 1245:2011 - Adhesives - Determination of pH

Relations

• Replaces: SIST EN 1245:2000 - Adhesives - Determination of pH - Test method
• Effective Date: 01-Jul-2011

Overview

SIST EN 1245:2011 is a European Standard established by CEN, detailing a precise method for determining the pH of adhesives and related products using electrometry. This standard specifies the use of a pH meter equipped with a combined glass and silver reference electrode to measure the pH of adhesives supplied in an aqueous medium or those that can be dissolved, dispersed, or suspended in water. It excludes adhesives that chemically react with water. Accurate pH measurement is crucial for quality control and ensuring adhesive performance in industrial applications.

Key Topics

• Scope & Applicability: Applies to adhesives with known concentration in aqueous media and related constituents but not to adhesives reactive with water.
• Measurement Principle: Electrochemical determination of pH by measuring potential difference between a glass electrode and a silver reference electrode in the sample.
• Electrodes & Equipment: Use of combined glass and silver/silver chloride electrodes with a high input impedance pH meter (≥10¹² Ω) and temperature compensation.
• Calibration: Calibration at two points using buffer solutions at pH 7 and either pH 4 or pH 9 to ensure meter accuracy.
• Sample Preparation: Homogenization of samples; solid or highly viscous adhesives are diluted or dispersed 1:1 with water when necessary.
• Test Conditions: Temperature control and equilibration of electrodes, buffers, and samples near 23 °C to reduce measurement errors.
• Accuracy Considerations: Method accuracy declines at pH values above 11 due to alkaline error from electrode limitations.
• Reagents: Use of deionized or distilled water (EN ISO 3696 compliant) and specifically prepared or commercially available buffer solutions.
• Result Reporting: pH values rounded to nearest 0.1 unit and reported with test temperature and relevant sample details.

Applications

The SIST EN 1245:2011 standard is vital for industries and laboratories involved in manufacturing, testing, and quality control of adhesives. Practical applications include:

• Adhesive Formulation: Monitoring pH to ensure chemical stability and performance during production.
• Quality Assurance: Verifying adhesive batches meet pH specifications critical for bonding effectiveness and safety.
• Compliance Testing: Ensuring products conform to European regulations and standards related to adhesive chemistry.
• Product Development: Supporting research for developing water-compatible adhesives with controlled pH characteristics.
• Environmental and Safety Monitoring: Managing waste disposal of adhesive samples and reagents following local environmental guidelines.

By adhering to SIST EN 1245:2011, manufacturers and testing laboratories maintain consistent and reliable pH measurement practices that directly impact product quality and regulatory compliance.

Related Standards

• EN 923:2005+A1:2008 – Adhesives - Terms and Definitions, providing standardized terminology used in adhesive testing.
• EN 1067 – Adhesives - Examination and Preparation of Samples for Testing, describing proper sample handling procedures.
• EN ISO 3696:1995 – Water for Analytical Laboratory Use, defining water purity required for accurate analytical measurements.
• EN ISO 15605 – Adhesives - Sampling, outlining methods for representative adhesive sampling.

Integration with these standards ensures comprehensive and consistent adhesive testing protocols aligned with European regulatory frameworks.

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Keywords: SIST EN 1245:2011, adhesive pH determination, pH measurement, adhesives testing standard, CEN adhesives standard, pH meter calibration, pH of adhesives, European adhesive standard, pH electrode, aqueous adhesives, adhesive quality control, adhesive formulation pH

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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