SIST EN ISO 19918:2018
(Main)Protective clothing - Protection against chemicals - Measurement of cumulative permeation of chemicals with low vapour pressure through materials (ISO 19918:2017)
Protective clothing - Protection against chemicals - Measurement of cumulative permeation of chemicals with low vapour pressure through materials (ISO 19918:2017)
This international standard describes laboratory test methods to determine the resistance of materials and
seams used in protective clothing, including gloves, to permeation by liquids with low vapour pressure (less
than 1 mm Hg at 25°C) and/or insolubility in water or another liquid that does not interact with the material.
These chemicals that are often part of pesticide formulations and other mixtures cannot be measured using
other standards for measuring permeation.
This test method is suitable for field strength and concentrated pesticide formulations as well as other
mixtures in which the active ingredient is a chemical with low vapour pressure and/or insolubility in water or
another liquid that does not interact with the clothing material. This method may not be suitable for testing
protective clothing materials against volatile pesticide formulations.
The degree of contamination depends on numerous factors such as type of exposure, application technique,
and pesticide formulation. As the level of exposure can vary considerably, this method is designed to rate
relative performance of PPE materials for different durations.
This method is designed to measure cumulative permeation. Breakthrough time cannot be measured by this
method. This test method does not measure resistance to penetration or degradation.
The test method standard can be used for the evaluation of materials that are new or those that have
undergone treatment, such as laundering or simulated abrasion. Details of the treatment shall be reported.
This test method can also be used to determine the resistance provided by protective clothing materials
against permeation of chemicals with low vapour pressure.
Schutzkleidung - Schutz gegen Chemikalien - Messung der kumulativen Permeation von Chemikalien mit niedrigem Dampfdruck durch Schutzkleidungs- und Handschuhmaterialien (ISO 19918:2017)
Diese Internationale Norm beschreibt Prüfverfahren im Labor zur Bestimmung des Widerstands von in persönlicher Schutzausrüstung (PSA) verwendeten Materialien, Verschlüssen und Nähten gegen Permeation fester oder flüssiger Chemikalien mit geringem Dampfdruck (weniger als 1 mm Hg bei 25 °C) und/oder nicht in Wasser oder anderen nicht mit dem PSA-Material reagierenden Flüssigkeiten löslicher Stoffe. Diese Chemikalien, die häufig in Pestizid-Rezepturen und anderen Gemischen vorkommen, können nicht mittels anderer Normen zur Messung der Permeation gemessen werden. Dieses Prüfverfahren ist geeignet für auf Anwendungsstärke verdünnte und für konzentrierte Pestizid-Rezepturen sowie andere Gemische, bei denen der aktive Inhaltsstoff eine Chemikalie mit geringem Dampfdruck und/oder geringer Löslichkeit in häufig verwendeten flüssigen und gasförmigen Sammelmedien ist.
Dieses Prüfverfahren soll nicht an Stelle von Normen, wie der ISO 6529, EN 16523-1, und AS/TM 739, welche flüssige und gasförmige Sammelmedien verwenden, angewendet werden. Dieses Prüfverfahren ist nicht geeignet zur Messung flüchtiger Chemikalien, welche verdampfen können, bevor die chemische Analyse abgeschlossen ist.
Der Kontaminationsgrad hängt von mehreren Faktoren ab, zum Beispiel der Expositionsart, Anwendungs-technik und Pestizid-Rezeptur. Da das Expositionsniveau erheblich variieren kann, ist dieses Verfahren so aufgebaut, dass die relative Leistungsfähigkeit der PSA-Materialien bei unterschiedlicher Dauer eingestuft wird.
Dieses Verfahren dient der Messung der kumulativen Permeation. Die Durchbruchzeit kann durch dieses Verfahren nicht gemessen werden. Dieses Prüfverfahren misst nicht den Widerstand gegen Penetration oder Degradation.
Die Norm für das Prüfverfahren kann zur Bewertung sowohl von neuen als auch von zum Beispiel durch Waschen oder simulierten Abrieb behandelten PSA-Materialien genutzt werden. Genaue Informationen zur Behandlung müssen in den Bericht aufgenommen werden.
Vêtements de protection - Protection contre les produits chimiques - Mesure de la perméation cumulée à travers des matériaux des produits chimiques ayant une faible pression de vapeur (ISO 19918:2017)
L'ISO 19918 décrit les méthodes d'essai de laboratoire employées pour déterminer la capacité des matériaux, fermetures et coutures utilisés sur les équipements de protection individuelle (EPI) à résister à la perméation de produits chimiques solides ou liquides caractérisés par une faible pression de vapeur (inférieure à 133,322 Pa à 25° C) et/ou par une insolubilité dans l'eau ou dans d'autres liquides communément utilisés comme milieux collecteurs. Ces produits chimiques qui font souvent partie de formulations de pesticides et d'autres mélanges ne peuvent pas être mesurés à l'aide d'autres normes de mesure de la perméation. Cette méthode d'essai s'applique aux mesures d'intensité de champ et aux formulations de pesticides concentrées ainsi qu'aux autres mélanges dans lesquels la matière active est un produit chimique caractérisé par une faible pression de vapeur et/ou une faible solubilité dans les milieux collecteurs liquides et gazeux communément utilisés.
Cette méthode d'essai n'a pas vocation à se substituer aux normes ISO 6529 et EN 16523‑1 et au standard ASTM F739, qui mesurent la perméation des produits chimiques volatils ou solubles dans l'eau ou dans d'autres liquides qui ne présentent aucune interaction avec le matériau soumis à essai. L'ISO 19918 ne convient pas pour la mesure des produits chimiques volatils susceptibles de s'évaporer avant la fin de l'analyse chimique.
Le degré de contamination dépend de nombreux facteurs, tels que le type d'exposition, la technique d'application et la formulation de produit chimique. Dans la mesure où le niveau d'exposition peut varier considérablement, cette méthode a été élaborée dans le but de classer les performances relatives des matériaux d'EPI pour différentes durées.
Cette méthode vise à mesurer la perméation cumulée. Elle ne s'applique pas à la mesure du temps de passage. Cette méthode d'essai ne permet pas de mesurer la résistance à la pénétration ou à la dégradation.
Elle peut être utilisée pour évaluer les matériaux d'EPI neufs ou les matériaux d'EPI pour lesquels la norme de produit nécessite un traitement particulier (par exemple, blanchissage ou abrasion simulée). Les détails du traitement doivent être consignés.
Varovalna obleka - Varovanje pred kemikalijami - Merjenje kumulativnega pronicanja kemikalij z nizkim parnim tlakom skozi materiale (ISO 19918:2017)
Ta mednarodni standard opisuje laboratorijske preskusne metode za določanje odpornosti materialov in šivov, ki se uporabljajo za varovalne obleke, vključno z rokavicami, proti pronicanju tekočin z nizkim parnim tlakom (manj kot 1 mm Hg pri 25 °C) in/ali netopnostjo v vodi ali drugi tekočini, ki ne vpliva na material. Teh kemikalij, ki so pogosto del pesticidnih pripravkov in drugih zmesi, ni mogoče izmeriti z uporabo drugih standardov za merjenje pronicanja. Ta preskusna metoda je primerna za jakosti polja in koncentrirane pesticidne pripravke ter druge zmesi, pri katerih je aktivna sestavina kemikalija z nizkim parnim tlakom in/ali netopnostjo v vodi, ali druga tekočina, ki ne reagira z materialom obleke. Ta metoda morda ni primerna za preskušanje materialov varovalnih oblek proti hlapnim pesticidnim pripravkom. Stopnja kontaminacije je odvisna od številnih dejavnikov, kot so vrsta izpostavljenosti, tehnika uporabe in sestava pesticida. Ker se lahko raven izpostavljenosti močno razlikuje, je ta metoda zasnovana za oceno relativne učinkovitosti materialov osebne varovalne opreme pri različnem trajanju izpostavljenosti. Ta metoda je zasnovana za merjenje kumulativnega pronicanja. Časa, v katerem pride do pronicanja, ni mogoče izmeriti s to metodo. Ta preskusna metoda se ne uporablja za merjenje odpornosti proti pronicanju ali degradaciji. Standard preskusne metode je mogoče uporabiti za oceno novih materialov ali tistih, ki so bili obdelani, npr. oprani ali podvrženi simulirani obrabi. O podrobnostih obdelave je treba poročati. To preskusno metodo je mogoče uporabiti tudi za določanje odpornosti, ki jo varovalna obleka zagotavlja proti pronicanju kemikalij z nizkim parnim tlakom.
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
SIST EN ISO 19918:2018
01-februar-2018
Varovalna obleka - Varovanje pred kemikalijami - Merjenje kumulativnega
pronicanja kemikalij z nizkim parnim tlakom skozi materiale (ISO 19918:2017)
Protective clothing - Protection against chemicals - Measurement of cumulative
permeation of chemicals with low vapour pressure through materials (ISO 19918:2017)
Schutzkleidung - Schutz gegen Chemikalien - Messung der kumulativen Permeation von
Chemikalien mit niedrigem Dampfdruck durch Schutzkleidungs- undHandschuhmaterialien (ISO 19918:2017)
Vêtements de protection - Protection contre les produits chimiques - Mesure de la
perméation cumulée à travers des matériaux des produits chimiques ayant une faible
pression de vapeur (ISO 19918:2017)Ta slovenski standard je istoveten z: EN ISO 19918:2017
ICS:
13.340.10 Varovalna obleka Protective clothing
SIST EN ISO 19918:2018 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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SIST EN ISO 19918:2018
EN ISO 19918
EUROPEAN STANDARD
NORME EUROPÉENNE
November 2017
EUROPÄISCHE NORM
ICS 13.340.10
English Version
Protective clothing - Protection against chemicals -
Measurement of cumulative permeation of chemicals with
low vapour pressure through materials (ISO 19918:2017)
Habillement de protection - Protection contre les Schutzkleidung - Schutz gegen Chemikalien - Messung
produits chimiques - Mesure de la perméation cumulée der kumulativen Permeation von Chemikalien mit
à travers des matériaux des produits chimiques ayant niedrigem Dampfdruck durch Materialien (ISO
une faible pression de vapeur (ISO 19918:2017) 19918:2017)This European Standard was approved by CEN on 15 September 2017.
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, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,
Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, 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: Avenue Marnix 17, B-1000 Brussels
© 2017 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 19918:2017 E
worldwide for CEN national Members.---------------------- Page: 3 ----------------------
SIST EN ISO 19918:2018
EN ISO 19918:2017 (E)
Contents Page
European foreword ....................................................................................................................................................... 3
Annex ZA (informative) Relationship between this European Standard and the essential
requirements of EU Directive 89/686/EEC aimed to be covered .................................................. 4
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EN ISO 19918:2017 (E)
European foreword
This document (EN ISO 19918:2017) has been prepared by Technical Committee ISO/TC 94 “Personal
safety - Protective clothing and equipment” in collaboration with Technical Committee CEN/TC 162
“Protective clothing including hand and arm protection and lifejackets” the secretariat of which is held
by DIN.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 May 2018, and conflicting national standards shall be
withdrawn at the latest by May 2018.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.
This document has been prepared under a mandate given to CEN by the European Commission and the
European Free Trade Association, and supports essential requirements of EU Directive(s).
For relationship with EU Directive(s), see informative Annex ZA, which is an integral part of this
document.According to the CEN-CENELEC Internal Regulations, the national standards organizations of the
following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria,
Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia,
France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta,
Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Turkey and the United Kingdom.Endorsement notice
The text of ISO 19918:2017 has been approved by CEN as EN ISO 19918:2017 without any modification.
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EN ISO 19918:2017 (E)
Annex ZA
(informative)
Relationship between this European Standard and the essential
requirements of EU Directive 89/686/EEC aimed to be covered
This European Standard has been prepared under a Commission’s standardization request M/031 to
provide one voluntary means of conforming to essential requirements of Directive 89/686/EEC on the
approximation of the laws of the Member States relating to personal protective equipment [1989 L399].
Once this document is cited in the Official Journal of the European Union under that Directive,
compliance with the normative clauses of this standard given in Table ZA.1 confers, within the limits of
the scope of this standard, a presumption of conformity with the corresponding essential requirements
of that Directive and associated EFTA regulations.Table ZA.1 — Correspondence between this International Standard and Annex II of the Directive
89/686/EEC Personal Protective EquipmentEssential Requirements of Clause(s)/subclause(s) of Remarks/Notes
Directive 89/686/EEC this International
Standard
3.10.2, Protection against cutaneous Complete Standard Together with the
and ocular contact requirements in the
product standard
WARNING 1 Presumption of conformity stays valid only as long as a reference to this European
Standard is maintained in the list published in the Official Journal of the European Union. Users of this
standard should consult frequently the latest list published in the Official Journal of the European
Union.WARNING 2 Other Union legislation may be applicable to the product(s) falling within the scope of this
standard.---------------------- Page: 6 ----------------------
SIST EN ISO 19918:2018
INTERNATIONAL ISO
STANDARD 19918
First edition
2017-09
Protective clothing — Protection
against chemicals — Measurement of
cumulative permeation of chemicals
with low vapour pressure through
materials
Habillement de protection — Protection contre les produits chimiques
— Mesure de la perméation cumulée à travers des matériaux des
produits chimiques ayant une faible pression de vapeur
Reference number
ISO 19918:2017(E)
ISO 2017
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SIST EN ISO 19918:2018
ISO 19918:2017(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2017, Published in Switzerland
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form
or by any means, electronic or mechanical, including photocopying, or posting on the internet or an intranet, without prior
written permission. Permission can be requested from either ISO at the address below or ISO’s member body in the country of
the requester.ISO copyright office
Ch. de Blandonnet 8 • CP 401
CH-1214 Vernier, Geneva, Switzerland
Tel. +41 22 749 01 11
Fax +41 22 749 09 47
copyright@iso.org
www.iso.org
ii © ISO 2017 – All rights reserved
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SIST EN ISO 19918:2018
ISO 19918:2017(E)
Contents Page
Foreword ........................................................................................................................................................................................................................................iv
Introduction ..................................................................................................................................................................................................................................v
1 Scope ................................................................................................................................................................................................................................. 1
2 Normative references ...................................................................................................................................................................................... 1
3 Terms and definitions ..................................................................................................................................................................................... 1
4 Principle ........................................................................................................................................................................................................................ 3
5 Apparatus and supplies ................................................................................................................................................................................. 3
6 Test parameters ..................................................................................................................................................................................................... 4
6.1 Analytical method ................................................................................................................................................................................ 4
6.2 Determination of extraction efficiency .............................................................................................................................. 5
6.3 Test specimens ........................................................................................................................................................................................ 5
7 Preparation of test chemical and test specimens ............................................................................................................... 6
8 Procedure..................................................................................................................................................................................................................... 6
8.1 Contamination ......................................................................................................................................................................................... 6
8.2 Extraction and analysis .................................................................................................................................................................... 7
9 Expression of results ........................................................................................................................................................................................ 7
10 Report .............................................................................................................................................................................................................................. 8
11 Precision and bias ............................................................................................................................................................................................... 9
Annex A (informative) Schematic diagram of the permeation cell ....................................................................................10
Annex B (normative) Drawing and measurements of the permeation cell, washer, and bolts ............11
Annex C (informative) Sources of permeation test cells, and permeation cell parts ......................................13
Annex D (informative) Selection of gasket and pressure .............................................................................................................14
Annex E (informative) Interlaboratory test data ..................................................................................................................................15
Bibliography .............................................................................................................................................................................................................................16
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SIST EN ISO 19918:2018
ISO 19918:2017(E)
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards is normally carried out
through ISO technical committees. Each member body interested in a subject for which a technical
committee has been established has the right to be represented on that committee. International
organizations, governmental and non-governmental, in liaison with ISO, also take part in the work.
ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of
electrotechnical standardization.The procedures used to develop this document and those intended for its further maintenance are
described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the
different types of ISO documents should be noted. This document was drafted in accordance with the
editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directives).Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of
any patent rights identified during the development of the document will be in the Introduction and/or
on the ISO list of patent declarations received (see www.iso.org/patents).Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.For an explanation on the voluntary nature of standards, the meaning of ISO specific terms and
expressions related to conformity assessment, as well as information about ISO's adherence to the
World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT) see the following
URL: www.iso.org/iso/foreword.html.This document was prepared by Technical Committee ISO/TC 94, Personal safety — Protective clothing
and equipment, Subcommittee SC 13, Protective clothing.iv © ISO 2017 – All rights reserved
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SIST EN ISO 19918:2018
ISO 19918:2017(E)
Introduction
When assessing the performance of personal protective equipment (PPE) against chemical risks, it is
clearly important to determine the ability of PPE materials to resist chemical ingress. The term "ingress"
is used here specifically so as not to distinguish between penetration and permeation. Penetration is
ingress through physical holes in the fabric such as pores, stitch-holes, and gaps in a protective coating.
Penetration is usually quite a rapid process, leading to the ingress of chemical within a matter of
minutes, whereas permeation is usually a slower process with molecular diffusion through a polymer
or elastomer. However, from the perspective of the wearer of PPE (gloves, footwear, protective clothing)
the mechanism of ingress is far less relevant than the fact that a quantity of chemical may at some point
migrate through the fabric of the personal protective equipment.Standards to measure permeation are designed to measure the performance of materials that include
a polymer or elastomer as the movement in these materials is at the molecular level. However, although
they are intended to measure movement of chemicals at a molecular level, it may be difficult to
differentiate between penetration and permeation in materials with small pores, pinholes, and gaps in
coating.A number of standards, including ISO 6529, EN 16523-1 and ASTM F739, measure permeation of
chemicals that are volatile and/or soluble in water or other liquid or gaseous collection media. In the
above-mentioned standards, volatility or solubility in water or other liquid that does not interact
with the material allows use of gaseous or liquid collection medium. However, based on the scopes of
ISO 6529, EN 16523-1 and ASTM F739, these standards are not well-suited for quantifying the ingress
of chemicals and mixtures that are involatile and/or insoluble in water and other liquids that do not
interact with the material being tested. This document complements the above-mentioned standards
as it is suitable for measuring chemicals that cannot be measured by other standards and vice versa.
This document is intended to be used to evaluate the barrier effectiveness materials used in personal
protective equipment against permeation by solid and liquid chemicals with low vapour pressure
and/or low solubility in commonly used liquid and gaseous collection media. This test method is not
suitable for measurement of volatile chemicals that may evaporate before the chemical analysis is
complete.© ISO 2017 – All rights reserved v
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SIST EN ISO 19918:2018
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SIST EN ISO 19918:2018
INTERNATIONAL STANDARD ISO 19918:2017(E)
Protective clothing — Protection against chemicals —
Measurement of cumulative permeation of chemicals with
low vapour pressure through materials
1 Scope
This document describes laboratory test methods to determine the resistance of materials, closures,
and seams used in personal protective equipment (PPE) to permeation by solid or liquid chemicals
with low vapour pressure (less than 133,322 Pa at 25 °C) and/or insolubility in water or other liquids
commonly used as collection media. These chemicals that are often part of pesticide formulations and
other mixtures cannot be measured using other standards for measuring permeation. This test method
is suitable for field strength and concentrated pesticide formulations as well as other mixtures in which
the active ingredient is a chemical with low vapour pressure and/or low solubility in commonly used
liquid and gaseous collection media.This test method is not intended to be used in place of standards such as ISO 6529, EN 16523-1 and
ASTM F739, which measure permeation of chemicals that are either volatile or soluble in water or
other liquids that do not interact with the material being tested. This document is not suitable for
measurement of volatile chemicals that may evaporate before the chemical analysis is complete.
The degree of contamination depends on numerous factors, such as type of exposure, application
technique, and chemical formulation. As the level of exposure can vary considerably, this method is
designed to rate relative performance of PPE materials for different durations.This method is designed to measure cumulative permeation. Breakthrough time cannot be measured
by this method. This test method does not measure resistance to penetration or degradation.
The test method standard may be used for the evaluation of PPE materials that are new or those for
which the product standard requires treatment, such as laundering or simulated abrasion. Details of
the treatment shall be reported.2 Normative references
No normative references are required for this document.
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at http://www.iso.org/obp— IEC Electropedia: available at http://www.electropedia.org/
3.1
analytical technique
method of quantifying the amount of permeated chemical in the collection medium
Note 1 to entry: Such methods are often specific to individual chemical and collection-medium combinations.
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SIST EN ISO 19918:2018
ISO 19918:2017(E)
3.2
breakthrough detection time
elapsed time measured from the start of the test to the sampling time that immediately precedes the
sampling time at which the test chemical is first detected3.3
cumulative permeation mass
total amount of chemical that permeates during a specified time from the time the material specimen is
first contacted with the test chemical3.4
degradation
deleterious change in one or more properties due to contact with a chemical or heat
3.5limit of quantification
minimum quantity of a substance which can be measured
Note 1 to entry: It is the value where the uncertainty of measurement is equal to 50% of the determined value.
3.6penetration
process by which a chemical and/or microorganism moves through porous materials, seams, pinholes,
or other imperfections in a material on a non-molecular levelNote 1 to entry: For the purpose of this document, penetration refers to only chemicals, not micro-organisms.
Note 2 to entry: For the purpose of this document, materials include protective clothing, footwear, and glove
materials.3.7
permeation
process by which a chemical moves through a material on a molecular level
Note 1 to entry: Permeation involves (1) adsorption of molecules of the chemical onto the contacted (outside)
surface of a material, (2) diffusion of the adsorbed molecules into and through the material, and (3) desorption of
the molecules from the opposite (inside) surface of the material.Note 2 to entry: For the purpose of this document, materials include protective clothing, footwear, and glove
materials.3.8
solid collection medium
solid material on the “clean” side of the test specimen in which any permeated chemical is collected
3.9test chemical
chemical or mixture of raw materials, including but not limited to, active ingredients, inert ingredients,
and a base solvent used in a formulationNote 1 to entry: For the purpose of this test method, test chemicals are limited to chemicals (including mixtures)
with low vapour pressure less than 133,322 Pa at 25 °C and/or insolubility in water or other liquids commonly
used as collection media.3.10
vapour pressure
pressure exerted by the vapour above the liquid in equilibrium at a given temperature
3.11insoluble chemical
chemical having solubility of less than 50 mg/l at 23 °C in water or other liquids commonly used as
collection media2 © ISO 2017 – All rights reserved
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SIST EN ISO 19918:2018
ISO 19918:2017(E)
3.12
closure
system or component which makes possible the closing of an item of PPE
4 Principle
A prepared collector disc shall be used to measure the cumulative permeation of chemicals with low
vapour pressure and/or insolubility in water and other commonly used collection media.
The collector disc is placed under the test material in the test assembly (see Annex A). The cell is placed
on a horizontal surface and filled with test chemical.After the predetermined duration of the test, the cell is emptied and the collector disc is removed for
extraction and quantitative analysis. The predetermined duration stated in the product standard
should be used when testing.The data are used to calculate cumulative permeation.
5 Apparatus and supplies
5.1 The permeation cell consists of a base and a cylinder that are assembled with three bolts to form a
cell. The centre of the base and the bottom surface of the cylinder are raised to improve contact between
the two surfaces. See Annex B for a technical drawing, including measurements for the permeation
cell. The gasket, collector disc, and test specimen are placed between the base and the cylinder. The
test specimen’s normal inside surface is in contact with the collector disc. The material’s outer surface
is toward the side that faces the test cylinder. The two pieces are connected with three bolts. The top
surface of the cylinder has a spout to make it easier to drain the test chemical. The schematic diagram of
the permeation cell is shown in Annex A.The cylindrical, hollow insert illustrated in Figure B.4 fits into the centre of the cell. The insert is to
maintain contact between the collector disc and the test specimen while the cell is being assembled. It
shall be filled to bring the mass to (100 ± 1) g.See Annex B for the drawing and description of PTFE cell used for the interlaboratory study.
Measurements (including tolerance limits) in Figures B.2 to B.4 pertain to the cell in Annex B.
NOTE 1 Annex C includes a list of suppliers for the PTFE permeation cell, gaskets, and collector discs.
NOTE 2 Cells made with other materials and designs have not been tested.NOTE 3 Other cells with similar design that give equivalent results could also be used.
5.2 Gasket, with (90,0 ± 0,1) mm outer diameter (OD) and (35,0 ± 0,1) mm inner diameter (ID) with
holes for the bolts.The gasket shall be used to prevent leakage. Care shall be taken to ensure that test chemical cannot leak
out of the challenge side of the apparatus, flow around the edge of the test specimen, and then leak into
the collection side. This is most likely to happen by capillary action if the outer side of a multicomponent
material is from woven or nonwoven material. The size of the gasket may be changed to control leakage.
Information on selection and size of gaskets is included in Annex D.5.3 Collector disc, a solid collection medium, with (50 ± 1) mm diameter and (20,0 ± 0,5) mm pre-cut
centre, made of Benchkote Plus . The pre-cut centre is attached to the outer ring at two opposite ends.
1) Benchkote Plus is the trade name of a polyethylene-backed, absorbent paper manufactured by Whatman/GE
Healthcare. Benchkote Plus is available through scientific product suppliers. This information is given for the
convenience of users and does not constitute an endorsement by ISO of this product.
© ISO 2017 – All rights reserved 3---------------------- Page: 15 ----------------------
SIST EN ISO 19918:2018
ISO 19918:2017(E)
NOTE The pre-cut centre of the collector disc is designed so that it is attached to the outer ring at two points
and can easily be removed for extraction. Only the pre-cut centre is extracted to prevent contamination around
the edges that can affect test results.5.4 Solvent, shall be selected for preparing the collector disc and extracting the chemical from the
collector disc. Selection of the solvent is based upon the chemical to be extracted and analytical method
used for chemical analysis. Care should be taken to ensure that the solvent present in the collector disc
does not degrade or damage the PPE material being tested.NOTE 1 Acetonitrile is suitable for preparing the collector disc when extraction is conducted with HPLC grade
acetonitrile or other liquids that are miscible with acetonitrile.NOTE 2 A small amount of solvent in the collector disc should not affect the PPE material. A blank test without
challenge chemical can be carried out to confirm that there are no adverse effects of the solvent on the PPE
material.5.5 Pipettor, for pipetting (1,00 ± 0,05) ml of solvent to prepare the collector disc.
5.6 Absorbent paper, one 80 mm × 80 mm square for preparation of each collector disc. The absorbent
paper squares shall be cut from Benchkote® Plus paper sold as sheets.NOTE Benchkote Plus absorbent paper sold as sheets is specified due to the difference in absorbency
between Benchkote® Plus paper sold as a roll and as sheets.5.7 Stopwatch or electronic timer.
5.8 Balance, accurate to 0,001 g. for weighing collector discs and 0,1 g for weighing test chemical.
5.9 (200 ± 2) g weight with a flat base that is (60 ± 1) mm in diameter to be placed on top of the
collector disc.NOTE The weight may be made of aluminium, brass, or any other metal.
5.10 Tweezers.
5.11 Hole punch tool, for punching holes accurately in test specimens.
5.12 Torque wrench, for tightening nuts in 4 Nm to 6 Nm range.
5.13 Orbital shaker, capable of (1,7 ± 0,2) s
5.14 Bottles, airtight chemically resistant, wide-mouth bottles (minimum opening of 25 mm) for
extraction.6 Test parameters
6.1 Analytical method
6.1.1 The method used to quantify the mass of test chemical in the collector disc shall be determined
before conducting the test.6.1.2 Any analytical method may be used provided that:
— it is suitably sensitive to the test chemical. The limit of quantification (LOQ) shall be 0,1 µg/cm
or lower;4 © ISO 2017 – All rights reserved
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