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-à-vis d'une solution moussante.
La méthode est applicable à 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

Status
Published
Publication Date
30-Nov-2002
ICS
71.100.40 - Surface active agents
Technical Committee
KDS - Cosmetics, chemical disinfectants and surface active agents
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
01-Dec-2002
Due Date
01-Dec-2002
Completion Date
01-Dec-2002
Ref Project
EN 13996:2002 - Surface active agents - Foaming power and antifoaming power - Turbine stirring method

Overview

EN 13996:2002 (CEN) specifies a laboratory method - the turbine stirring method - for measuring the foaming power of surface active agents and the antifoaming power (defoaming efficiency) of defoamers with respect to a defined foaming solution. The standard is applicable to all surface active agents, with particular emphasis on low-foaming products and antifoaming surface active agents. Note: results for readily hydrolyzable agents are not valid because hydrolysis products alter foam persistence.

Key topics and technical requirements

  • Principle: Foam is produced by high-speed stirring of a test solution; foam volume and stability are followed for 15 minutes.
  • Test solutions:
    • Foaming test uses the product at working concentration.
    • Antifoaming test uses a 1 g/l reference foaming solution (nonylphenol 10 EO or saponin) with added defoamer concentrations.
  • Critical test parameters:
    • Stirring speed: 2 000 min⁻¹ (high-speed stirrer).
    • Stirring duration: 5 minutes (±10 s).
    • Test volume: 900 g in a 2 L stainless steel beaker.
    • Test temperature: (20 ± 1) °C; use water grade per EN ISO 3696 or water of known hardness (EN 12829).
    • Foam volume measured at 0, 1, 2, 3, 5, 10 and 15 minutes.
  • Apparatus & cleanliness: turbine/centripetal blade stirrer, baffle, graduated cylinder; rigorous cleaning of glassware is required to avoid contamination.
  • Calculations:
    • Plot foam volume vs time.
    • Foaming power can be quantified as the area between the curve and the time axis (1–15 min) via the trapezium method.
    • Antifoaming efficiency E = 100·(So − Sc)/So, where So is the surface area for reference foam and Sc for the defoamer-containing solution.
  • Precision: Repeatability and reproducibility limits determined from ring tests (details provided in Annex A).

Applications and users

This standard is practical for:

  • Quality control and batch release testing of surfactants, detergent ingredients, and defoamers.
  • R&D and formulation development to compare foaming and antifoaming performance.
  • Regulatory or specification setting where standardized foaming metrics are required. Typical users: chemical manufacturers, detergent formulators, analytical laboratories, and technical service teams in cleaning and industrial process sectors.

Related standards

Normative references include EN 12829, EN ISO 3696, ISO 607, ISO 1042, and ISO 4788 - all relevant for water preparation, sampling and laboratory glassware.

Keywords: EN 13996:2002, foaming power, antifoaming power, turbine stirring method, surface active agents, defoamer, CEN standard, foam stability.

Frequently Asked Questions

SIST EN 13996:2002 is a standard published by the Slovenian Institute for Standardization (SIST). Its full title is "Surface active agents - Foaming power and antifoaming power - Turbine stirring method". This standard covers: 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.

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.

SIST EN 13996:2002 is classified under the following ICS (International Classification for Standards) categories: 71.100.40 - Surface active agents. The ICS classification helps identify the subject area and facilitates finding related standards.

You can purchase SIST EN 13996:2002 directly from iTeh Standards. The document is available in PDF format and is delivered instantly after payment. Add the standard to your cart and complete the secure checkout process. iTeh Standards is an authorized distributor of SIST standards.

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
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

Ring test result.15SIST EN 13996:2002

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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