Adhesives - Terms and definitions

This European Standard defines terms used in the adhesive industry and terms relating to adhesives in those industries that use adhesives.

Klebstoffe - Benennungen und Definitionen

Diese Europäische Norm definiert Begriffe, die in der Klebstoffindustrie verwendet werden, sowie Begriffe, die sich in der klebstoffverarbeitenden Industrie auf Klebstoffe beziehen.

Adhésifs - Termes et définitions

La présente Norme européenne définit les termes utilisés dans l’industrie des adhésifs ainsi que ceux y afférant et qui sont usités dans les industries utilisatrices d’adhésifs.

Lepila - Izrazi in definicije

Ta evropski standard določa izraze, ki se uporabljajo v industriji lepil, in izraze, ki se nanašajo na lepila v industrijah, kjer se ta lepila uporabljajo.

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9092 - Decision on results of review/2YR ENQ - revise - Review Enquiry
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SIST EN 923:2006+A1:2008
Lepila - Izrazi in definicije
Adhesives - Terms and definitions
Klebstoffe - Benennungen und Definitionen
Adhésifs - Termes et définitions
Ta slovenski standard je istoveten z: EN 923:2015
01.040.83 Gumarska industrija in Rubber and plastics
industrija polimernih industries (Vocabularies)
materialov (Slovarji)
83.180 Lepila Adhesives
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN 923
December 2015
ICS 01.040.83; 83.180 Supersedes EN 923:2005+A1:2008
English Version
Adhesives - Terms and definitions
Adhésifs - Termes et définitions Klebstoffe - Benennungen und Definitionen
This European Standard was approved by CEN on 16 November 2015.

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
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.


CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2015 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 923:2015 E
worldwide for CEN national Members.

Contents Page
European foreword . 3
Introduction . 4
1 Scope . 5
2 Terms and definitions . 5
2.1 Adhesives . 5
2.2 Functional adhesive components . 10
2.3 Chemical base products . 14
2.4 Adhesive properties . 25
2.5 Material and material treatment . 30
2.6 Bonding . 33
2.7 Bond properties . 40
Annex A (informative) Adhesives . 46
Annex B (informative) Adhesive joints . 48
Alphabetical index . 49

European foreword
This document (EN 923:2015) has been prepared by Technical Committee CEN/TC 193 “Adhesives”,
the secretariat of which is held by AENOR.
This document supersedes EN 923:2005+A1:2008.
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 June 2016, and conflicting national standards shall be
withdrawn at the latest by June 2016.
In comparison to EN 923:2005+A1:2008, several new terms have been added ( 3 terms to Section 2.1, 3
terms to Section 2.2, 7 terms to section 2.3, 3 terms to Section 2.4, 1 term to Section 2.5, 1 term to
Section 2.6, 1 term to Section 2.7) and some definitions have been updated or corrected.
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
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.
This European Standard comprises terms peculiar to, or in general use in, the adhesive and adhesive
processing industry.
The terms defined have been classified so that, as far as possible, related concepts (adhesives,
functional adhesive components, chemical base products, adherents, adhesives properties, bonding, and
bond properties) are grouped together. All definitions are numbered and an alphabetical index which
includes all terms is provided at the end of this European Standard.
The numbering of the individual definitions is the same in all three versions (English, French and
German) of this European Standard. Consequently this European Standard can be used as a dictionary,
combined with one or both of the other versions as an aid for translation of terms into French or
German, as a source of information about related concepts in the adhesive industry or to provide a term
for a concept.
In order to find:
a) the definition of a term: look up the term in the alphabetical index at the end of this European
Standard. The index will refer to the number in this European Standard. The definition, the term
and any synonyms appear by the number;
b) information about related terms: look up the term in the alphabetical index to find its number in
this European Standard. When the term has been located in this European Standard, the related
concepts can be found in the same subdivision;
c) the translation of a term into the French or German language: look up the number of this term in
this European Standard and locate the translation of the term and the definition under the same
number in the standard of the foreign version.
1 Scope
This European Standard defines terms used in the adhesive industry and terms relating to adhesives in
those industries that use adhesives.
2 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
2.1 Adhesives
non-metallic substance capable of joining materials by surface bonding (adhesion), and the bond
possessing adequate internal strength (cohesion)
Note 1 to entry: Many adhesives names refer to their main functional components or the physical nature of the
Table A.1 lists main binders, temperature and mode of setting of these adhesives and the number of parts that
have to be mixed before use. Some other names refer to
— the method of application, or
— the mode of setting.
Furthermore, adhesives are named according to points of less significance:
— field of application (e.g. footwear adhesive, construction adhesive, packaging adhesive),
— material to bond (e.g. paper adhesive, wood adhesive, wall paper adhesive, rubber adhesive),
— place of application (e.g. in situ adhesive),
— speed of setting (e.g. instant adhesive),
— bond properties (e.g. structural adhesive),
— shape (e.g. powder adhesive, pearl glue, table glue for solid glue, adhesive film for shaped adhesive, or stick
adhesive for stick shaped adhesives), or
— aspect (e.g. white glue).
water-borne adhesive
aqueous adhesive
adhesive in which the solvent, or the continuous phase is water
aqueous adhesive specifically designed for bonding of wood and other porous substrates
Note 1 to entry: A glue can be based on a natural product like protein or synthetic resins (UF, PF or PVAC, see
2.3.51, 2.3.52 and 2.3.30 respectively)
paste adhesive
adhesive of a non-stringy, highly viscous nature
Note 1 to entry: Paste adhesives based on starch or cellulose ethers are usually applied for paper bonding (e.g.
paper bags or wall paper).
dispersion adhesive
adhesive consisting of a stable dispersion of a polymer in a liquid continuous phase, usually water
Note 1 to entry: Dispersion adhesives containing an elastomer as polymer conventionally are often termed
emulsion adhesive
adhesive consisting of a stable emulsion of a liquid hydrophobic resin in water
solvent-borne adhesive
solution adhesive
solvent-based adhesive
adhesive in which the binder is dissolved in a volatile organic solvent
solvent free adhesive
adhesive that is substantially free from organic solvents (see 2.1.7)
Note 1 to entry: “Substantially free” means that organic solvents have neither been added in the basic elements
of an adhesive nor during its process of manufacture out of these basic elements. “Low solvent adhesives” contain
at most 5 % of solvents based on total weight of the adhesive.
plastisol adhesive
paste or liquid adhesive material comprising a dispersion of a polymer resin in a plasticizer that when
partially heated, gels as the plasticizer is incorporated into the swollen polymer to form a solid system
Note 1 to entry: The plastisol will be converted into a solid plastic simply by heating to fully fuse.
toughened adhesive
adhesive which by virtue of its physical structure discourages propagation of cracks
Note 1 to entry: The toughening can be achieved, for example, by the creation of a discrete elastomeric phase
within the adhesive matrix.
spray adhesive
adhesive that is projected in small particles by means of a pressure medium
gap-filling adhesive
adhesive designed for filling wider gaps between uneven surfaces
Note 1 to entry: For high strength load-bearing purposes, e.g. in the car industry, the adhesive will provide
satisfactory bond strength in bond-lines up to 1 mm in thickness. For the construction industry, high solid
adhesives designed for use between uneven surfaces and to bond satisfactorily in gaps up to 6 mm are used.
adhesive material, used to fill gaps where movement can occur in service and which, when set, can
accommodate movement
Note 1 to entry: The term “sealant” is also used for a material filling a void against the ingress or egress of a
fluid, gaseous substance or airborne particles under pressure.
film adhesive
adhesive in film form, with or without a carrier
Note 1 to entry: Film adhesives set usually by means of heat under pressure.
foaming adhesive
adhesive designed to foam in situ, after application, in order to provide extensive gap-filling properties
unsupported film adhesive
adhesive supplied in sheet, film or web form, without an incorporated carrier
supported film adhesive
adhesive supplied in sheet or film form with an incorporated carrier in sheet, film, fabric or web form
that is coated with adhesives on one or both sides and that remains in the bond when the adhesive is
applied and used
Note 1 to entry: The carrier can be woven or non-woven material consisting of organic or inorganic fibres, as
well as foams, plastic or metal films, etc.
adhesive tape
flexible backing or carrier coated with a pressure-sensitive, remoistenable, or heat activated adhesive
transfer tape
carrier coated with a pressure-sensitive adhesive which, when detached from the substrate, permits the
carrier to be removed leaving only the adhesive
double coated adhesive tape
double sided adhesive tape
tape where the adhesive is applied on both sides of the carrier
multiple-layer adhesive
film adhesive, usually supported with a different adhesive composition on each side
Note 1 to entry: Multiple-layer adhesives are designed to bond dissimilar materials.
encapsulated adhesive
adhesive in which particles or droplets of the adhesive or an adhesive component are enclosed in a
protective film (microcapsules) usually to prevent cross-linking until the film is destroyed by suitable
one-way stick adhesive
adhesive that is applied to only one of the adherends
separate application adhesive
adhesive consisting of different components which are applied separately to adherends
Note 1 to entry: Pressing together the components initiates a chemical reaction curing the bond-line.
two way stick adhesive
double spread adhesive
adhesive that is applied to both

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