SIST EN 14022:2003

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Strukturklebstoffe - Bestimmung der Topfzeit (Verarbeitungszeit) von MehrkomponentenklebstoffenAdhésifs structuraux - Détermination de la durée de vie en pot (délai d'utilisation) des adhésifs multicomposantsStructural Adhesives - Determination of the pot life (working life) of multicomponent adesives83.180LepilaAdhesivesICS:Ta slovenski standard je istoveten z:EN 14022:2003SIST EN 14022:2003en01-december-2003SIST EN 14022:2003SLOVENSKI
STANDARD
EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN 14022September 2003ICS 83.180English versionStructural Adhesives - Determination of the pot life (working life)of multicomponent adesivesAdhésifs structuraux - Détermination de la durée de vie enpot (tempos de travail) des adhésifs multicomposantsStrukturklebstoffe - Bestimmung der Topfzeit(Verarbeitungszeit) von MehrkomponentenklebstoffenThis European Standard was approved by CEN on 1 August 2003.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 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 Management Centre has the same status as the officialversions.CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece,Hungary, Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal, Slovakia, Spain, Sweden, Switzerland and UnitedKingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMITÉ EUROPÉEN DE NORMALISATIONEUROPÄISCHES KOMITEE FÜR NORMUNGManagement Centre: rue de Stassart, 36
B-1050 Brussels© 2003 CENAll rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 14022:2003 ESIST EN 14022:2003

by which a batch of the reaction product reaches a definedtemperature, the so-called critical temperature (e.g. 40 °C). For products producing less than 40 °C exothermicreaction heat in the defined batch, the maximum temperature is taken as criteria.5 Limits of the test methodsWhile the described test methods are suitable for assessing multicomponent epoxide or polyurethane-basedadhesives, they are not suitable for some acrylic based-adhesives.6 SafetyPersons using this standard shall be familiar with normal laboratory practice. This standard does not purport toaddress all safety problems, if any, associated with its use. It is the responsibility of the user to establish safety andhealth practices and to ensure compliance with any European and national regulatory conditions.7 Determination7.1 GeneralThe adhesive to be tested, by any one the five given test methods, shall be sampled, prepared and examinedaccording to EN 1066 and EN 1067. For any method chosen, at least three samples shall be evaluated and themean determined.7.2 Method 1: Determination by means of a change in apparent viscosity (rotating viscometer oroscillating rheometer)7.2.1 PrincipleA multicomponent adhesive is mixed and its pot life established by measuring the time taken for its viscosity tochange by a specified amount.This method is not suitable for the determination of pot lives that are shorter than 5 min in duration.SIST EN 14022:2003

± 1 s.7.2.2.6 Test enclosure, capable of being maintained at the test temperature and if necessary at a relativehumidity of (50 ± 5) %.7.2.3 ProcedureBoth components of the product shall be maintained separately at (23 ± 2) °C. The single components shall beweighed into the beaker (see 7.2.2.2) according to the mixing ratio specific for the product, with the preferred massof the batch of the products being 200 g.Other masses can also be used.Start the stopwatch (see 7.2.2.5) and mix the batch with an angular, not circular end of a spatula (see 7.2.2.3) formore than 1 min. Take care that also the areas within the angle between side and bottom of the beaker are wellmixed.It is also allowed to determine a pot life of a batch which was produced with the help of a static or dynamic mixer,which has to be defined specifically.Immediately after mixing measure the viscosity with a viscometer (see 7.2.2.4) of the freshly prepared adhesive.Record the first data after having finished mixing as the starting viscosity point. Continue the measurement inintervals dependent on the pot life expected.NOTE 1The number of measurements as well as the extent of shear at mixing of the components and the measurementitself can have an influence on viscosity and pot life. Therefore, it is recommended to fix the intervals of measurements as wellas mixing, shear speed and rotational speed specific to the adhesive.The pot life of the adhesive is the difference between time at the end of mixing and the time when a fixed agreedviscosity is reached. Usually the fixed agreed viscosity is double the starting viscosity.7.3 Method 2: Determination by means of a change in extrusion rate7.3.1 PrincipleA multi-component adhesive is mixed and its pot life established by measuring the time taken for there to be aspecified decrease in the quantity of adhesive extruded through a calibrated orifice, in unit time, under standardconditions.This method is not suitable for the measurement of pot lives that are shorter than 5 min in duration.SIST EN 14022:2003
...