EN ISO 10619-2:2011

SLOVENSKI STANDARD
01-februar-2012
1DGRPHãþD
SIST EN ISO 4672:2000
Gumene in polimerne cevi ter cevovodi - Merjenje gibljivosti in togosti - 2. del:
Upogibni preskus pri temperaturah, nižjih od temperature okolja (ISO 10619-
2:2011)
Rubber and plastics hoses and tubing - Measurement of flexibility and stiffness - Part 2:
Bending tests at sub-ambient temperatures (ISO 10619-2:2011)
Gummi- und Kunststoffschläuche - Biegeprüfungen bei einer Temperatur unterhalb der
Umgebungstemperatur (ISO 10619-2:2011)
Tuyaux et tubes en caoutchouc et en plastique - Mesurage de la flexibilité et de la rigidité
- Partie 2: Essais de courbure à des températures inférieures à l'ambiante (ISO 10619-
2:2011)
Ta slovenski standard je istoveten z: EN ISO 10619-2:2011
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 10619-2
NORME EUROPÉENNE
EUROPÄISCHE NORM
December 2011
ICS 23.040.70 Supersedes EN ISO 4672:1999
English Version
Rubber and plastics hoses and tubing - Measurement of
flexibility and stiffness - Part 2: Bending tests at sub-ambient
temperatures (ISO 10619-2:2011)
Tuyaux et tubes en caoutchouc et en plastique - Mesurage Gummi- und Kunststoffschläuche mit und ohne Einlage -
de la flexibilité et de la rigidité - Partie 2: Essais de Bestimmung der Biegsamkeit und Steifigkeit - Teil 2:
courbure à des températures inférieures à l'ambiante (ISO Biegeprüfungen bei Temperaturen unterhalb der
10619-2:2011) Umgebungstemperatur (ISO 10619-2:2011)
This European Standard was approved by CEN on 30 November 2011.

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, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, and United Kingdom.

EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2011 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 10619-2:2011: E
worldwide for CEN national Members.

Contents Page
Foreword .3

Foreword
This document (EN ISO 10619-2:2011) has been prepared by Technical Committee ISO/TC 45 “Rubber and
rubber products” in collaboration with 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 June 2012, and conflicting national standards shall be withdrawn at
the latest by June 2012.
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 4672:1999.
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, 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 10619-2:2011 has been approved by CEN as a EN ISO 10619-2:2011 without any
modification.
INTERNATIONAL  ISO
STANDARD 10619-2
First edition
2011-12-01
Rubber and plastics hoses and
tubing — Measurement of flexibility and
stiffness —
Part 2:
Bending tests at sub-ambient
temperatures
Tuyaux et tubes en caoutchouc et en plastique — Mesurage de la
flexibilité et de la rigidité —
Partie 2: Essais de courbure à des températures inférieures à
l’ambiante
Reference number
ISO 10619-2:2011(E)
©
ISO 2011
ISO 10619-2:2011(E)
©  ISO 2011
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
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Web www.iso.org
Published in Switzerland
ii © ISO 2011 – All rights reserved

ISO 10619-2:2011(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 10619-2 was prepared by Technical Committee ISO/TC 45, Rubber and rubber products, Subcommittee
SC 1, Hoses (rubber and plastics).
This first edition cancels and replaces ISO 4672:1997, which has been technically revised.
ISO 10619 consists of the following parts, under the general title Rubber and plastics hoses and tubing —
Measurement of flexibility and stiffness:
—  Part 1: Bending tests at ambient temperature
—  Part 2: Bending tests at sub-ambient temperatures
—  Part 3: Bending tests at high and low temperatures
© ISO 2011 – All rights reserved  iii

INTERNATIONAL STANDARD ISO 10619-2:2011(E)
Rubber and plastics hoses and tubing — Measurement of
flexibility and stiffness —
Part 2:
Bending tests at sub-ambient temperatures
WARNING — Persons using this part of ISO 10619 should be familiar with normal laboratory practice.
This part of ISO 10619 does not purport to address all of the safety problems, if any, associated with
its use. It is the responsibility of the user to establish appropriate safety and health practices and to
ensure compliance with any national regulatory conditions.
1 Scope
This part of ISO 10619 specifies two methods for measuring the stiffness and one method for the determination
of the flexibility of rubber and plastics hoses and tubing when they are bent to a specific radius at sub-ambient
temperatures.
Method A is suitable for non-collapsible rubber and plastics hoses and tubing with a bore of up to and including
25 mm. This method provides a means of measuring the stiffness of the hose or tubing when the temperature
is reduced from a standard laboratory temperature.
Method B is suitable for rubber and plastics hoses and tubing with a bore of up to 100 mm and provides a
means of assessing the flexibility of the hose or tubing when bent around a mandrel at a specified sub-ambient
temperature. It can also be used as a routine quality control test.
Method C is suitable for rubber and plastics hoses and tubing with a bore of 100 mm and greater. This method
provides a means of measuring the stiffness of the hose and tubing at sub-ambient temperatures. This method
is only suitable for hoses and tubing which are non-collapsible.
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 1402, Rubber and plastics hoses and hose assemblies — Hydrostatic testing
ISO 8330, Rubber and plastics hoses and hose assemblies — Vocabulary
ISO 23529, Rubber — General procedures for preparing and conditioning test pieces for physical test methods
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 8330 and the following apply.
3.1
bending
shaping or forcing something straight into a curve or angle at a specified temperature
© ISO 2011 – All rights reserved  1

ISO 10619-2:2011(E)
3.2
flexibility
ease of bending a hose without it being damaged by kinking, collapse, breaking or cracking
NOTE  A hose can be bent around a mandrel, for example.
3.3
stiffness
resistance of a hose to bending
4 Method A
This method applies to non-collapsible hoses with a bore of up to and including 25 mm only.
4.1 Apparatus
4.1.1 Torque  wheel, having a diameter equal to twice the minimum bend radius specified for the hose,
provided with equipment for holding the hose tangential to the wheel, a suitable device to bend the hose around
the wheel, and a strain gauge and graphical recorder to measure the torque with an accuracy of ± 3 % (see
Figure 1). If the minimum bend radius is not specified, the torque wheel shall have a diameter equal to 12 times
the nominal bore of the hose (see Figure 1).
4.1.2 Cooling container, equipped with an agitator, a temperature-measuring device and a roller having a
diameter of 50 mm for guiding the hose (see Figure 1). The coolant shall not affect the hose under test and shall
be used as prescribed in ISO 23529. A suitable coolant liquid is methanol or ethanol with crushed dry ice (solid
carbon dioxide) added. Gaseous coolants may be employed when the design of the apparatus is such that the
tests using such coolants give results equivalent to those obtained with liquid coolants.
4.2 Hose test piece
4.2.1 Type
The hose test pieces shall be cut from the hose under test and shall have a length equal to:
2 πR+d   (1)
( )
where
R  is the minimum bend radius as specified in the relevant hose product standard;
d  is the hose bore.
4.2.2 Number of hose test pieces
At least three hose test pieces shall be used for each test.
No test shall be carried out less than 24 h after manufacture of the hose.
4.3 Test temperature
The test shall be conducted at one of the following temperatures:
0 °C ± 2 °C
−10 °C ± 2 °C
−25 °C ± 2 °C
2 © ISO 2011 – All rights reserved

ISO 10619-2:2011(E)
−40 °C ± 2 °C
−55 °C ± 2 °C
or any other sub-ambient temperature as defined in the relevant product standard.
4.4 Procedure
Clamp one end of the hose test piece (4.2) on the wheel (4.1.1), with the rest of the test piece straight. If the
hose has natural curvature, this curvature shall follow that of the wheel.
Without coolant in the container (4.1.2), determine the torque required to bend the test specimen through 180º
round the wheel at the standard temperature chosen from those given in ISO 25329. The time for bending shall
be (12 ± 2) s. Repeat the test with the container filled with coolant at the chosen test temperature (see 4.3).
Condition the hose test piece in a cold chamber at the test temperature for 24 h followed by conditioning at the
test temperature in the apparatus for at least 30 min before testing.
4.5 Expression of results
For each hose test piece, calculate the mean torque at the standard temperature and the mean torque at the
test temperature by calculating the mean of the peak values contained in the central 50 % of the respective
torque traces.
Calculate the stiffness, S, expressed as the ratio of the mean torque at the test temperature to that at the
standard temperature, from Equation (2):
T
t
S =   (2)
T
o
where
T  is the torque at the test temperature (mean value from three tests);
t
T  is the torque at the standard temperature (mean value from the three tests).
o
If the individual values for the three test specimens do not agree to within 15 % of the mean value at each
temperature, the test shall be repeated.
4.6 Test report
The test report shall include the following:
a)  reference to this part of ISO 10619, i.e. ISO 10619-2:2011;
b)  a full description of the hose and its origin;
c)  the dimensions of the hose test pieces;
d)  the coolant used;
e)  the standard temperature and the test temperature;
f)  the torque at the standard temperature, T, and at the test temperature, T;
o t
g)  the calculated value of the stiffness, S;
h)  the date of
...