EN 14712:2005

Surface active agents - Determination of physical stability in alkaline and acid solutions

This European Standard specifies a method for the determination of physical stability of surface active agents in alkaline and acid solutions. It is applicable to all classes of surface active agents and also to other substances or mixtures such as polymers, complexing agents and formulations of surface active agents.

Grenzflächenaktive Stoffe - Bestimmung der physikalischen Stabilität in alkalischer und saurer Lösung

Diese Europäische Norm legt ein Verfahren zur Bestimmung der physikalischen Stabilität von grenzflächen-
aktiven Stoffen in alkalischer und saurer Lösung fest. Das Verfahren gilt für alle Klassen von grenzflächenak-
tiven Stoffen, aber auch für andere Stoffe oder Mischungen wie Polymere, Komplexiermittel und Formulierun-
gen von grenzflächenaktiven Stoffen.

Agents de surface - Détermination de la stabilité physique dans les solutions alcalines et acides

La présente Norme européenne spécifie une méthode de détermination de la stabilité physique des agents de surface dans les solutions alcalines et acides. Elle est applicable à toutes les classes d'agents de surface ainsi qu'à d'autres substances ou mélanges tels que les polymères, les agents complexants et les formulations d'agents de surface.

Površinsko aktivne snovi – Določanje fizikalne stabilnosti alkalnih in kislih raztopin

General Information

• Status: Published
• Publication Date: 17-May-2005
• Withdrawal Date: 29-Nov-2005
• ICS: 71.100.40 - Surface active agents
• Technical Committee: CEN/TC 276 - Surface active agents
• Drafting Committee: CEN/TC 276/WG 2 - Methods of test
• Current Stage: 9093 - Decision to confirm - Review Enquiry
• Completion Date: 31-Oct-2024
• Ref Project: SIST EN 14712:2005 - Surface active agents - Determination of physical stability in alkaline and acid solutions

Standards Content (Sample)

SLOVENSKI STANDARD
01-november-2005
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Surface active agents - Determination of physical stability in alkaline and acid solutions
Grenzflächenaktive Stoffe - Bestimmung der physikalischen Stabilität in alkalischer und
saurer Lösung
Agents de surface - Détermination de la stabilité physique dans les solutions alcalines et
acides
Ta slovenski standard je istoveten z: EN 14712:2005
ICS:
71.100.40 Površinsko aktivna sredstva Surface active agents
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD
EN 14712
NORME EUROPÉENNE
EUROPÄISCHE NORM
May 2005
ICS 71.100.40
English version
Surface active agents - Determination of physical stability in
alkaline and acid solutions
Agents de surface - Détermination de la stabilité physique Grenzflächenaktive Stoffe - Bestimmung der physikalischen
dans les solutions alcalines et acides Stabilität in alkalischer und saurer Lösung
This European Standard was approved by CEN on 25 March 2005.
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 Central Secretariat 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 Central Secretariat has the same status as the official
versions.
CEN members are the national standards bodies of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France,
Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia,
Slovenia, Spain, Sweden, Switzerland and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre: rue de Stassart, 36  B-1050 Brussels
© 2005 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 14712:2005: E
worldwide for CEN national Members.

Contents
Page
Foreword.3
Introduction .4
1 Scope .5
2 Normative references .5
3 Terms and definitions .5
4 Principle.5
5 Reagents.5
6 Apparatus .6
7 Procedure .6
8 Expression of results .8
9 Test report .8
Annex A (normative) Forms for the test report .9

Foreword
This European Standard (EN 14712:2005) has been prepared by Technical Committee CEN/TC 276 “Surface
active agents”, 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 or
by endorsement, at the latest by November 2005, and conflicting national standards shall be withdrawn at the latest
by November 2005.
According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following
countries are bound to implement this European Standard: Austria, Belgium, Cyprus, Czech Republic, Denmark,
Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta,
Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.
Introduction
The stability of a surface active agent in alkaline and acid solutions is its physical stability during the defined time
period, as judged by its appearance. The statement "the surface active agent A has an alkaline stability of x g
NaOH per litre" means that the surface active agent A can be dissolved in a concentration of 10 g/l in an aqueous
solution containing up to x g NaOH per litre to give a stable solution. Analogously the statement "the surface active
agent A has an acid stability of y ml sulfuric acid per litre" means that the surface active agent A can be dissolved
with a concentration of 10 g/l in an aqueous solution containing up to y ml sulfuric acid per litre (with a purity of
95 % to 97 %) to give a stable solution.
It should be noted that miscibility gaps can occur, i.e. the solution can be unstable at intermediate alkali or acid
concentrations.
The definition of a stable solution depends on the application of the surface active agent or surface active agent
formulation. Thus homogeneous opalescent or turbid solutions may be considered either stable or unstable.
1 Scope
This European Standard specifies a method for the determination of physical stability of surface active agents in
alkaline and acid solutions. It is applicable to all classes of surface active agents and also to other substances or
mixtures such as polymers, complexing agents and formulations of surface active agents.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated references,
only the edition cited applies. For undated references, the latest edition of the referenced document (including any
amendments) applies.
EN ISO 3696, Water for analytical laboratory use — Specification and test methods (ISO 3696:1987).
3 Terms and definitions
For the purposes of this European Standard, the following terms and definitions apply.
3.1
alkaline stability
maximum mass concentration of sodium hydroxide (purity at least of 98 %) in grams per litre at which the surface
active agent can be dissolved in the alkaline solution with a mass concentration of 1 % to yield a stable solution
3.2
acid stability
maximum volume concentration of sulfuric acid (purity 95 % to 98 %), in millilitres per litre, at which the surface
active agent can be dissolved in the acid solution with a mass concentration of 1 % to yield a stable solution
3.3
other bases and acids
other bases and acids may be used. This should be described together with the purity in the test report
4 Principle
Aqueous solutions are prepared with increasing concentrations of sodium hydroxide or sulfuric acid respectively.
Then the surface active agent to be tested is mixed in these aqueous solutions. The formulations are examined
visually after 24 h of storage at ambient temperature (22 ± 3) °C to see whether a stable solution resulted or not.
Clear homogeneous solutions are always considered stable, whereas phase separation indicates instability.
Homogeneous opalescent or homogeneous turbid samples can be considered either stable or unstable depending
on the surface active agent application.
5 Reagents
5.1 Water, grade 3, in accordance with EN ISO 3696.
5.2 Sodium hydroxide, NaOH, analytical grade, preferably as an aqueous solution with a mass concentration
of 30 % NaOH (this corresponds to 398 g NaOH (100 % active substance) in 1 l ; density ρ= 1,328 g/ml at 20 °C).
5.3 Sulfuric acid, H SO , analytical grade, preferably as an aqueous solution with a mass concentration of
2 4
25 % H SO (density ρ = 1,18 g/ml at 20 °C).
2 4
6 Apparatus
6.1 General
Ordinary laboratory apparatus and the following:
6.2 Glass beakers or bottles with magnetic stirrer sticks, for storing and assessing the sample
solutions. 125 ml screw-top jars are recommended.
NOTE Within the series the same type o
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