SIST EN 4426:2020
(Main)Aerospace series - Non-metallic materials - Textiles - Test method - Determination of conductivity and pH of aqueous extracts
Aerospace series - Non-metallic materials - Textiles - Test method - Determination of conductivity and pH of aqueous extracts
This document specifies the requirements for the determination of conductivity and pH of aqueous extracts of textile materials.
This method has been written in response to an aerospace requirement for a method of extraction using hot water as the EN 1413 requires only a cold water extraction method.
Luft- und Raumfahrt - Nichtmetallische Werkstoffe - Textilien - Prüfverfahren - Bestimmung der Leitfähigkeit und des pH-Werts in wässerigen Lösungen
Dieses Dokument legt die Anforderungen an die Bestimmung der Leitfähigkeit und des pH-Werts wässriger Extrakte von Textilmaterialien fest.
Dieses Verfahren wurde als Reaktion auf eine Anforderung der Luft- und Raumfahrt beschrieben, um ein Extraktionsverfahren mit heißem Wasser festzulegen, da in EN 1413 ausschließlich ein Verfahren mit kaltem Wasser gefordert wird.
Série aérospatiale - Matériaux non-métalliques - Textiles - Méthode d'essai - Détermination de la conductivité et du pH des résidus aqueux
Le présent document spécifie les exigences pour la détermination de la conductivité et du pH des extraits aqueux de matériaux textiles.
Cette méthode a été élaborée pour répondre à un besoin de l’industrie aérospatiale d’une méthode d’extraction utilisant de l’eau chaude, étant donné que l’EN 1413 ne nécessite qu’une méthode d’extraction à base d’eau froide.
Aeronavtika - Nekovinski materiali - Tekstilije - Preskusne metode - Določanje prevodnosti in pH vodnih ekstraktov
General Information
Overview
EN 4426:2020 - published by CEN for the aerospace series - is a test method for determining the conductivity and pH of aqueous extracts from textile materials used in aerospace applications. The standard defines a hot-water extraction procedure (developed to meet aerospace requirements) and complementary measurement techniques to assess ionic contamination and acidity/alkalinity of textile extracts. It supplements existing textile test methods by providing a hot extraction alternative to EN 1413’s cold-water method.
Key topics and requirements
- Scope: Measurement of conductivity (mS/m) and pH of aqueous extracts from textile samples for aerospace non-metallic materials (textiles).
- Extraction method: Hot-water reflux of conditioned samples - nominal 5 g of sample in 100 ml de‑ionised water (liquor ratio 1:20), boiled gently for 60 minutes, cooled to (20 ± 2) °C.
- Sample handling: Samples cut to readily wettable pieces (nominal 10 mm squares), conditioned under standard atmosphere (EN ISO 2231), and handled to avoid contamination.
- Conductivity measurement: Use of a platinized electrode conductivity cell (recommended cell constant K ≈ 0.1 cm), calibrated at 20 °C with KCl 0.001 mol/l (12,780 mS/m). Conductivity calculated using the standard temperature-correction formula specified in the standard.
- pH measurement: pH meter with glass electrode calibrated with two buffers (4 & 7 for acidic ranges, 7 & 9 for alkaline ranges). pH is determined from the second and third extracts; mean reported to nearest 0.05 pH unit.
- Equipment & reagents: Round-bottom flasks (250 ml) with ground joints, water-cooled condensers, de‑ionised water (<0.2 mS/m), laboratory balance, conductivity meter, pH meter.
- Test report requirements: Reference to EN 4426, sample identification (lot/batch), measured conductivity and pH, operator traceability, test date, and details of any deviations.
Applications and users
- Practical for aerospace materials engineers, textile suppliers, laboratory technicians, and quality control teams who need to verify ionic contamination and chemical neutrality of textile components (e.g., seat fabrics, insulation, linings) used in aircraft and spacecraft.
- Useful in incoming inspection, supplier qualification, failure analysis and environmental compatibility assessments where ionic conductivity and pH of extracts can affect corrosion, electronic systems, or adhesive bonding.
Related standards
- EN 1413 (textiles - pH of aqueous extract; cold-water extraction)
- EN 4385 (series organization for aerospace non-metallic materials)
- EN ISO 2231 (conditioning and testing atmospheres)
- ISO 383 (laboratory glassware ground joints)
Keywords: EN 4426:2020, aerospace standard, textiles test method, conductivity, pH, aqueous extracts, hot water extraction, CEN.
Frequently Asked Questions
SIST EN 4426:2020 is a standard published by the Slovenian Institute for Standardization (SIST). Its full title is "Aerospace series - Non-metallic materials - Textiles - Test method - Determination of conductivity and pH of aqueous extracts". This standard covers: This document specifies the requirements for the determination of conductivity and pH of aqueous extracts of textile materials. This method has been written in response to an aerospace requirement for a method of extraction using hot water as the EN 1413 requires only a cold water extraction method.
This document specifies the requirements for the determination of conductivity and pH of aqueous extracts of textile materials. This method has been written in response to an aerospace requirement for a method of extraction using hot water as the EN 1413 requires only a cold water extraction method.
SIST EN 4426:2020 is classified under the following ICS (International Classification for Standards) categories: 49.025.60 - Textiles. The ICS classification helps identify the subject area and facilitates finding related standards.
You can purchase SIST EN 4426:2020 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)
SLOVENSKI STANDARD
01-maj-2020
Aeronavtika - Nekovinski materiali - Tekstilije - Preskusne metode - Določanje
prevodnosti in pH vodnih ekstraktov
Aerospace series - Non-metallic materials - Textiles - Test method - Determination of
conductivity and pH of aqueous extracts
Luft- und Raumfahrt - Nichtmetallische Werkstoffe - Textilien - Prüfverfahren -
Bestimmung der Leitfähigkeit und des pH-Werts in wässerigen Lösungen
Série aérospatiale - Matériaux non-métalliques - Textiles - Méthode d'essai -
Détermination de la conductivité et du pH des résidus aqueux
Ta slovenski standard je istoveten z: EN 4426:2020
ICS:
49.025.60 Tekstilije Textiles
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
EN 4426
EUROPEAN STANDARD
NORME EUROPÉENNE
February 2020
EUROPÄISCHE NORM
ICS 49.025.60
English Version
Aerospace series - Non-metallic materials - Textiles - Test
method - Determination of conductivity and pH of aqueous
extracts
Série aérospatiale - Matériaux non-métalliques - Luft- und Raumfahrt - Nichtmetallische Werkstoffe -
Textiles - Méthode d'essai - Détermination de la Textilien - Prüfverfahren - Bestimmung der
conductivité et du pH des extraits aqueux Leitfähigkeit und des pH-Werts in wässerigen
Lösungen
This European Standard was approved by CEN on 8 December 2019.
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
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 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, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and
United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2020 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 4426:2020 E
worldwide for CEN national Members.
Contents Page
European foreword . 3
Introduction . 4
1 Scope . 5
2 Normative references . 5
3 Terms and definitions . 5
4 Health, safety and environment . 5
5 Principle/technique . 6
6 Resources . 6
7 Test samples/test pieces . 6
8 Test procedure . 7
9 Expression of results. 8
10 Calculation of pH . 8
11 Measurement uncertainties . 8
12 Designation . 8
13 Test report . 8
European foreword
This document (EN 4426:2020) has been prepared by the Aerospace and Defence Industries Association
of Europe — Standardization (ASD-STAN).
After enquiries and votes carried out in accordance with the rules of this Association, this Standard has
received the approval of the National Associations and the Official Services of the member countries of
ASD, prior to its presentation to CEN.
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 August 2020, and conflicting national standards shall be
withdrawn at the latest by August 2020.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN shall not be held responsible for identifying any or all such patent rights.
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, France, Germany, Greece, Hungary, Iceland, Ireland,
Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Republic of North
Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United
Kingdom.
Introduction
This document is part of the series of EN non-metallic materials standards for aerospace applications.
The general organization of this series is described in EN 4385. This document is a level 3 document as
defined in EN 4385.
1 Scope
This document specifies the requirements for the determination of conductivity and pH of aqueous
extracts of textile materials.
This method has been written in response to an aerospace requirement for a method of extraction using
hot water as the EN 1413 requires only a cold water extraction method.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edi
...
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