SIST EN 13996:2002
(Main)Surface active agents - Foaming power and antifoaming power - Turbine stirring method
Surface active agents - Foaming power and antifoaming power - Turbine stirring method
This European Standard specifies a method for measuring the foaming power of a surface active agent and the antifoaming power of a defoamer with regard to a foaming solution.
The method is applicable to all surface active agents and particularly to low foaming products and antifoaming surface active agents.
However, measurement of the foaming power of solutions of readily hydrolyzable agents does not give valid results, as the hydrolysis products gather in the films of liquid and affect the persistence of the foam.
Grenzflächenaktive Stoffe - Schäumvermögen und Entschäumerwirkung - Verfahren mittels Turbinenrührgerät
Agents de surface - Pouvoir moussant et pouvoir antimoussant - Méthode d'agitation par turbine
La présente Norme européenne spécifie une méthode de mesurage du pouvoir moussant d'un agent de surface et du pouvoir antimoussant d'un antimoussant vis-a-vis d'une solution moussante.
La méthode est applicable a tous les agents de surface et en particulier aux produits faiblement moussants et aux agents de surface antimoussants.
Toutefois, le mesurage du pouvoir moussant des solutions d'agents de surface facilement hydrolysables ne donne pas de résultats valables, puisque les produits d'hydrolyse se rassemblent dans les films de liquide et intervient sur la persistance de la mousse.
Površinsko aktivne snovi – Moč penjenja in protipenjenja – Metoda turbinskega mešanja
General Information
Standards Content (Sample)
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.PHãDQMDGrenzflächenaktive Stoffe - Schäumvermögen und Entschäumerwirkung - Verfahren mittels TurbinenrührgerätAgents de surface - Pouvoir moussant et pouvoir antimoussant - Méthode d'agitation par turbineSurface active agents - Foaming power and antifoaming power - Turbine stirring method71.100.40Površinsko aktivna sredstvaSurface active agentsICS:Ta slovenski standard je istoveten z:EN 13996:2002SIST EN 13996:2002en01-december-2002SIST EN 13996:2002SLOVENSKI
STANDARD
SIST EN 13996:2002
EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN 13996October 2002ICS 71.100.40English versionSurface active agents - Foaming power and antifoaming power -Turbine stirring methodAgents de surface - Pouvoir moussant et pouvoirantimoussant - Méthode d'agitaion par turbineGrenzflächenaktive Stoffe - Schäumvermögen undEntschäumerwirkung - Verfahren mittels TurbinenrührgerätThis European Standard was approved by CEN on 9 September 2002.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,Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMITÉ EUROPÉEN DE NORMALISATIONEUROPÄISCHES KOMITEE FÜR NORMUNGManagement Centre: rue de Stassart, 36
B-1050 Brussels© 2002 CENAll rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 13996:2002 ESIST EN 13996:2002
EN 13996:2002 (E)2ContentspageForeword.31Scope.42Normative references.43Terms and definitions.44Principle.55Reagents.56Apparatus.57Sampling.68Preparation of test solutions.69Procedure.710Calculation and expression of results.711Precision.812Test report.8Annex A (informative)
Ring test result.15SIST EN 13996:2002
EN 13996:2002 (E)3ForewordThis document (EN 13996:2002) has been prepared by Technical Committee CEN /TC 276 "Surface activeagents", the secretariat of which is held by AFNOR.This European Standard shall be given the status of a national standard, either by publication of an identical text orby endorsement, at the latest by April 2003 and conflicting national standards shall be withdrawn at the latest byApril 2003.Annex A is informative.According to the CEN/CENELEC Internal Regulations, the national standards organizations of the followingcountries are bound to implement this European Standard: Austria, Belgium, Czech Republic, Denmark, Finland,France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal, Spain,Sweden, Switzerland and the United Kingdom.SIST EN 13996:2002
EN 13996:2002 (E)41 ScopeThis European Standard specifies a method for measuring the foaming power of a surface active agent and theantifoaming power of a defoamer with regard to a foaming solution.The method is applicable to all surface active agents and particularly to low foaming products and antifoamingsurface active agents.However, measurement of the foaming power of solutions of readily hydrolyzable agents does not give validresults, as the hydrolysis products gather in the films of liquid and affect the persistence of the foam.2 Normative referencesThis European Standard incorporates by dated or undated reference, provisions from other publications. Thesenormative references are cited at the appropriate places in the text, and the publications are listed hereafter. Fordated references, subsequent amendments to or revisions of any of these publications apply to this EuropeanStandard only when incorporated in it by amendment or revision. For undated references the latest edition of thepublication referred to applies (including amendments).EN 12829, Surface active agents - Preparation of water with known calcium hardness (ISO 2174:1990 modified).EN ISO 3696, Water for analytical laboratory use - Specification and test methods (ISO 3696:1987).ISO 607, Surface active agents and detergents - Methods of sample division.ISO 1042, Laboratory glassware - One-mark volumetric flasks.ISO 4788, Laboratory glassware - Graduated measuring cylinders.3 Terms and definitionsFor the purposes of this European Standard, the following terms and definitions apply.3.1foammass of gas cells separated by thin films of liquid and formed by the juxtaposition of bubbles, giving a gasdispersed in a liquid3.2foaming powerability to produce foamNOTEIn this European Standard, foaming power is characterised by the volume of foam obtained immediately and theevolution of this volume during the 15 min following its formation, under specific experimental conditions.3.3foaming agentsubstance which, when introduced into a liquid, confers on it an ability to form foam3.4antifoaming agentdefoamersubstance which prevents the formation of a foam or considerably reduces foam persistenceNOTEAntifoaming power is defined in relation to defined solutions of reference foaming agents such as saponin ornonylphenol with 10 ethylene oxide molecules (NP 10 EO).SIST EN 13996:2002
EN 13996:2002 (E)5In this European Standard, antifoaming power is characterised by the evolution of the volume of foam obtainedimmediately and the stability of this volume during the 15 min following its formation, as a function of the defoamercontent of the reference foaming solution, under specific experimental conditions. Temperature is a significantparameter.4 PrincipleA foam is produced by stirring a surface active agent solution, or a reference foaming solution containing adefoamer, using a turbine stirrer.The volume of foam obtained immediately is measured and the evolution of this volume during the 15 min followingits formation is monitored to determine the foaming power of the surface active agent, or the defoaming power ofthe defoamer with regard to the reference foaming solution.NOTEBy varying the stirring methods, (for example by changing the stirrer, rotating speed, the presence of counterblades,baffle, the stirring duration) the procedure can be modified to give results for a wide range of applications.5 Reagents5.1Water, grade 3, in accordance with EN ISO 3696.5.2Reference foaming agent, either nonylphenol 10 EO, with a cloud temperature of (64 ± 2) °C or saponin,analytical grade.6 ApparatusOrdinary laboratory apparatus and the following.NOTEPerfect cleanliness of the apparatus is essential for the success of the test. Glassware can be cleaned by leaving itin contact with a mixture of chromic acid solution and sulfuric acid solution. The apparatus should always be rinsed with a smallquantity of the solution under test.6.1Laboratory high speed stirrer1), with continuously variable speeds ranging from 50 min-1 to 3 500 min-1,electronically controlled.6.2Centripetal blade stirrer2), with 40 mm diameter.6.3Baffle, (10 ´ 10) mm.6.4Stainless steel beaker, 2 l capacity with a height of 190 mm and diameter of 120 mm.6.5Thermometer, capable of measuring a range from 10 °C to 40 °C to the nearest 0,5 °C.6.6Timer, stopwatch or clock, capable of measuring to the nearest 2 s.6.7Tachometer, suitable for measuring the speed of the centripetal blade stirrer.6.8Graduated measuring cylinders, capacity 2 000 ml, in accordance with ISO 4788.6.9Volumetric flask, capacity 1 000 ml, in accordance with ISO 1042.
1)Turbotest Compact 10-44 from Rayneri supplied by VMI (F.85601 Montaigu, France) is an example of suitable apparatusavailable commercially. This information is given for the convenience of users of this standard and does not constitute anendorsement by CEN of this apparatus.2)Centripetal blade stirrer from Rayneri supplied by VMI (F.85601 Montaigu, France) is an example of suitable apparatusavailable commercially. This information is given for the convenience of users of this standard and does not constitute anendorsement by CEN of this apparatus.SIST EN 13996:2002
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