EN ISO 8308:2008

SLOVENSKI STANDARD
01-februar-2009
1DGRPHãþD
SIST EN ISO 8308:2000
*XPHQHDOLSROLPHUQHFHYLLQFHYRYRGL8JRWDYOMDQMHSUHQRVDWHNRþLQVNR]LVWHQH
FHYLLQVWHQHFHYRYRGRY,62
Rubber and plastics hoses and tubing - Determination of transmission of liquids through
hose and tubing walls (ISO 8308:2006)
Gummi - und Kunststoffschläuche mit und ohne Einlagen - Bestimmung der
Durchlässigkeit von Schlauchwandungen gegenüber Flüssigkeiten (ISO 8308:2006)
Tuyaux et tubes en caoutchouc et en plastique - Détermination de la transmission des
liquides a travers les parois des tuyaux et des tubes (ISO 8308:2006)
Ta slovenski standard je istoveten z: EN ISO 8308:2008
ICS:
23.040.70 Gumene cevi in armature Hoses and hose assemblies
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD
EN ISO 8308
NORME EUROPÉENNE
EUROPÄISCHE NORM
January 2008
ICS 23.040.70 Supersedes EN ISO 8308:1995
English Version
Rubber and plastics hoses and tubing - Determination of
transmission of liquids through hose and tubing walls (ISO
8308:2006)
Tuyaux et tubes en caoutchouc et en plastique - Gummi- und Kunststoffschläuche mit und ohne Einlagen -
Détermination de la transmission des liquides à travers les Bestimmung der Durchlässigkeit von Schlauchwandungen
parois des tuyaux et des tubes (ISO 8308:2006) gegenüber Flüssigkeiten (ISO 8308:2006)
This European Standard was approved by CEN on 26 December 2007.
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 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 Management Centre has the same status as the
official versions.
CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland,
France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal,
Romania, 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
© 2008 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 8308:2008: E
worldwide for CEN national Members.

Foreword
The text of ISO 8308:2006 has been prepared by Technical Committee ISO/TC 45 "Rubber and
rubber products” of the International Organization for Standardization (ISO) and has been taken
over as EN ISO 8308:2008 by Technical Committee CEN/TC 218 "Rubber and plastics hoses
and hose assemblies", the secretariat of which is held by BSI.
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 July 2008, and conflicting national standards
shall be withdrawn at the latest by July 2008.
Attention is drawn to the possibility that some of the elements of this document may be the
subject of patent rights. CEN [and/or CENELEC] shall not be held responsible for identifying any
or all such patent rights.
This document supersedes EN ISO 8308:1995.
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, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece,
Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United
Kingdom.
Endorsement notice
The text of ISO 8308:2006 has been approved by CEN as EN ISO 8308:2008 without any
modifications.
INTERNATIONAL ISO
STANDARD 8308
Third edition
2006-10-15
Rubber and plastics hoses and tubing —
Determination of transmission of liquids
through hose and tubing walls
Tuyaux et tubes en caoutchouc et en plastique — Détermination de la
transmission des liquides à travers les parois des tuyaux et des tubes

Reference number
ISO 8308:2006(E)
©
ISO 2006
ISO 8308:2006(E)
PDF disclaimer
This PDF file may contain embedded typefaces. In accordance with Adobe's licensing policy, this file may be printed or viewed but shall
not be edited unless the typefaces which are embedded are licensed to and installed on the computer performing the editing. In
downloading this file, parties accept therein the responsibility of not infringing Adobe's licensing policy. The ISO Central Secretariat
accepts no liability in this area.
Adobe is a trademark of Adobe Systems Incorporated.
Details of the software products used to create this PDF file can be found in the General Info relative to the file; the PDF-creation
parameters were optimized for printing. Every care has been taken to ensure that the file is suitable for use by ISO member bodies. In the
unlikely event that a problem relating to it is found, please inform the Central Secretariat at the address given below.
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means,
electronic or mechanical, including photocopying and microfilm, without permission in writing from either ISO at the address below or
ISO's member body in the country of the requester.
ISO copyright office
Case postale 56  CH-1211 Geneva 20
Tel. + 41 22 749 01 11
Fax + 41 22 749 09 47
E-mail copyright@iso.org
Web www.iso.org
Published in Switzerland
©
ii ISO 2006 – All rights reserved

ISO 8308:2006(E)
Contents Page
1 Scope . 1
2 Normative references . 1
3 Principle . 1
3.1 Method A . 1
3.2 Method B . 1
4 Test liquid . 1
5 Method A . 2
5.1 Apparatus . 2
5.2 Test pieces . 3
5.3 Test temperature . 3
5.4 Test pressure . 3
5.5 Procedure . 3
5.6 Expression of results . 4
5.7 Test report . 4
6 Method B . 4
6.1 Apparatus . 4
6.2 Test piece . 4
6.3 Test temperature . 5
6.4 Procedure . 5
6.5 Expression of results . 7
6.6 Test report . 7
©
ISO 2006 – All rights reserved iii

ISO 8308:2006(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.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.
The main task of technical committees is to prepare International Standards. Draft International Standards
adopted by the technical committees are circulated to the member bodies for voting. Publication as an
International Standard requires approval by at least 75 % of the member bodies casting a vote.
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.
ISO 8308 was prepared by Technical Committee ISO/TC 45, Rubber and rubber products, Subcommittee SC 1,
Hoses (rubber and plastics).
This third edition cancels and replaces the second edition (ISO 8308:1993), which has been technically revised,
the main changes being made in the procedure for method B.
©
iv ISO 2006 – All rights reserved

INTERNATIONAL STANDARD ISO 8308:2006(E)
Rubber and plastics hoses and tubing — Determination of
transmission of liquids through hose and tubing walls
1Scope
This International Standard specifies two methods for the determination of transmission of liquids through hose
and tubing walls. Both methods are applicable to rubber and plastics hose and tubing, and comprise:
— method A, for all hose sizes and constructions: a practical comparative test, simulating working conditions;
— method B, for hose and tubing up to 16 mm internal diameter.
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.
ISO 4671, Rubber and plastics hoses and hose assemblies — Methods of measurement of dimensions of
hoses and length of hose assemblies
ISO 4788, Laboratory glassware — Graduated measuring cylinders
ISO 23529, Rubber — General procedures for preparing and conditioning test pieces for physical test methods
3 Principle
3.1 Method A
This method is carried out on an assembly mounted in a test apparatus fitted with equipment to fill and measure
a charged volume of a volatile liquid. The system is put under pressure, and the change in volume measured at
24 h
intervals until the change has become constant with time, i.e. an equilibrium state has been reached. The
test result is this steady-state evaporation rate, expressed as the volume of liquid lost per hour per unit inside
surface area of the hose or tubing.
3.2 Method B
This method uses a pressureless reservoir. A length of hose or tubing is attached to the reservoir, the other end
of the hose or tubing being plugged. The reservoir is partially filled with test liquid and sealed. The assembly is
weighed at the start of the test, and once every 24 h for eight days. The test result is the maximum mass of
liquid lost in any one 24 h period per unit inside surface area of the hose or tubing.
NOTE The method accounts for loss by permeation and evaporation and helps to minimize selective permeation of
components in a fuel mixture since the liquid is agitated daily.
4 Test liquid
The test liquid shall be that specified in the appropriate product standard.
©
ISO 2006 – All rights reserved 1

ISO 8308:2006(E)
5 Method A
WARNING — Because of the presence of potentially hazardous vapours, ensure that this test is carried
out in a well-ventilated area.
5.1 Apparatus
The apparatus consists of a nitrogen gas source connected to a pipe system. The gas pressure is controlled by
a regulator and pressure gauge.
It is essential that the system be provided with a safety valve.
The test piece is fixed vertically and is connected to the apparatus at the top via a measuring cylinder
conforming to ISO 4788 and at the bottom via a charging valve (see Figure 1).
Key
1 pressurized-nitrogen source
2 pressure regulator
3 main valve
4 safety valve
5 pressure gauge
6 venting valve
7 measuring cylinder
8 test piece
9 charging valve
10 safety shield
Figure 1 — Apparatus f
...