SIST EN 828:2014

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Klebstoffe - Benetzbarkeit - Bestimmung durch Messung des Kontaktwinkels und der freien Oberflächenenergie fester OberflächenAdhésifs - Mouillabilité - Détermination par mesurage de l'angle de contact et de l'énergie superficielle libre de la surface solideAdhesives - Wettability - Determination by measurement of contact angle and surface free energy of solid surface83.180LepilaAdhesivesICS:Ta slovenski standard je istoveten z:EN 828:2013SIST EN 828:2014en,fr,de01-april-2014SIST EN 828:2014SLOVENSKI
STANDARDSIST EN 828:19981DGRPHãþD



SIST EN 828:2014



EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 828
January 2013 ICS 83.180 Supersedes EN 828:1997English Version
Adhesives - Wettability - Determination by measurement of contact angle and surface free energy of solid surface
Adhésifs - Mouillabilité - Détermination par mesurage de l'angle de contact et de l'énergie superficielle libre de la surface solide
Klebstoffe - Benetzbarkeit - Bestimmung durch Messung des Kontaktwinkels und der freien Oberflächenenergie fester Oberflächen This European Standard was approved by CEN on 24 November 2012.
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, 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.
EUROPEAN COMMITTEE FOR STANDARDIZATION
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B-1000 Brussels © 2013 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 828:2013: ESIST EN 828:2014



EN 828:2013 (E) 2 Contents Page Foreword . 3 1 Scope . 4 2 Normative references . 4 3 Terms and definitions . 4 4 Principle. 6 5 Test equipment . 6 6 Measuring conditions . 7 7 Procedure . 8 8 Expression of results . 9 9 Test report . 9 Bibliography. 11
SIST EN 828:2014



EN 828:2013 (E) 3 Foreword This document (EN 828:2013) 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 July 2013, and conflicting national standards shall be withdrawn at the latest by July 2013. 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 828:1997. Safety Statement People applying this document, the user shall be familiar with normal laboratory practice. This standard does not purport to address all the safety problems, if any, associated with its use. It is the responsibility of the user to establish safety and health practices and to ensure their compliance with the provisions of any regulatory conditions. Environmental Statement It is understood that some of the material permitted in this standard may have a negative environmental impact. As technological advantages lead to acceptable alternatives for these materials, they will be eliminated from this standard as far as possible. At the end of the test, the user of the standard should take care to carry out appropriate disposal of waste, according to local regulations. According to the CEN/CENELEC Internal Regulations, the national standards organisations of the following countries are bound to implement this European Standard: 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 the United Kingdom.
SIST EN 828:2014



EN 828:2013 (E) 4 1 Scope This European Standard specifies a method for the determination of the surface free energy of a solid surface by measuring the contact angle of a liquid wetting the solid surface. It allows the prediction of the ability of a particular adhesive to wet a particular adherend. It can be used to characterise surfaces intended for pre-treatment, coating or bonding. NOTE 1 In order to determine the surface free energy, the method of measuring the static contact angle is used in combination with a statistical interpretation. NOTE 2 The measurement results are influenced by mechanical surface roughness and chemical homogeneity. 2 Normative references The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. 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 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 triple point point where the solid, the liquid and the gas phases coincide with each other Note 1 to entry: The triple point can be identified in the silhouette of a liquid drop situated on a test piece, at the intersection of the drop's contour line with the test piece surface. 3.2 baseline in the case of plane test pieces, a straight line going through the two triple points 3.3 contact angle
angle to the baseline, formed by a tangent to the drop contour going through one of the triple points (see Figure 1) SIST EN 828:2014



EN 828:2013 (E) 5
Key 1 solid body surface 2 liquid drop σL surface tension (= surface energy) of the liquid in equilibrium with the gas phase σS surface free energy of the solid body surface γSL interfacial energy of the solid body surface in contact with the liquid
contact angle Figure 1 — Wettability 3.4 wettability a liquid coming into contact with a solid surface exhibits a typical drop shape. The characteristic of the drop is the angle formed by the tangent to the contour at the triple point (wetting point) (Figure 1). A contact angle = 0º indicates a surface that is completely wetted 3.5 contour analysis image analysis procedure consisting in capturing the silhouette of a liquid drop on a surface by optical methods and calculating the contour profile of that silhouette 3.6 surface free energy of a solid σS energy measure (expressed in mN/m) which characterises the wettability of a solid material by a liquid that is based on the adsorption theory. The forces present in the state of equilibrium are described by Young's formula: σS = γSL + σL ⋅ cos θ (1) The Young-Dupré formula defines the work of adhesion obtained during wetting: Wad = σL + σL ⋅ cos θ = σL ⋅ (1 + cos θ) (2) The position of the thermodynamic equilibrium resulting in the formation of the static contact angle depends on both the pressure and the temperature conditions. When carrying out the measurement, standard conditions should be maintained. Since the interfacial energy and the surface energy are based on interactive forces between atoms or molecules, it is necessary to take polar
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