ISO 23297:2008

Thermoplastics hoses and hose assemblies — Wire or synthetic yarn reinforced single-pressure types for hydraulic applications — Specification

ISO 23297:2008 specifies requirements for eight classes and two types (construction with adhesive bond between layers and construction without adhesive bond between layers) of wire or synthetic yarn reinforced hydraulic hoses and hose assemblies of nominal size from 3,2 to 31,5. Each class has a single maximum working pressure for all sizes. Such hoses are suitable for use with hydraulic fluids HH, HL, HM, HR, and HV as defined in ISO 6743-4 at temperatures ranging from -40 °C to +100 °C for grades A and B and -40 °C to +120 °C for grades C and D. ISO 23297:2008 does not include requirements for end fittings. It is limited to the performance of hoses and hose assemblies. The hose assembly maximum working pressure is governed by the lowest maximum working pressure of the components.

Tuyaux et flexibles en matière thermoplastique — Types hydrauliques à pression unique, avec armature de fils métalliques ou synthétiques — Spécifications

General Information

• Status: Withdrawn
• Publication Date: 30-Nov-2008
• Withdrawal Date: 30-Nov-2008
• ICS: 23.100.40 - Piping and couplings
• ICS: 83.140.40 - Hoses
• Technical Committee: ISO/TC 45/SC 1 - Rubber and plastics hoses and hose assemblies
• Drafting Committee: ISO/TC 45/SC 1/WG 3 - Hydraulic hoses
• Current Stage: 9599 - Withdrawal of International Standard
• Completion Date: 06-Dec-2017

Relations

• Revised: ISO 23297:2017 - Thermoplastic hoses and hose assemblies — Wire or synthetic yarn reinforced single-pressure types for hydraulic applications — Specification
• Effective Date: 17-Dec-2016

Standards Content (Sample)

INTERNATIONAL ISO
STANDARD 23297
First edition
2008-12-15

Thermoplastics hoses and hose
assemblies — Wire or synthetic yarn
reinforced single-pressure types for
hydraulic applications — Specification
Tuyaux et flexibles en matière thermoplastique — Types hydrauliques à
pression unique, avec armature de fils métalliques ou synthétiques —
Spécifications




Reference number
ISO 23297:2008(E)
©
ISO 2008

---------------------- Page: 1 ----------------------
ISO 23297:2008(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.


COPYRIGHT PROTECTED DOCUMENT


©  ISO 2008
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
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Tel. + 41 22 749 01 11
Fax + 41 22 749 09 47
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Published in Switzerland

ii © ISO 2008 – All rights reserved

---------------------- Page: 2 ----------------------
ISO 23297:2008(E)
Contents Page
Foreword .iv
Introduction.v
1 Scope .1
2 Normative references.1
3 Terms and definitions .2
4 Classification .2
4.1 Classes .2
4.2 Types .2
4.3 Grades .2
5 Materials and construction.3
5.1 Hoses .3
5.2 Hose assemblies.3
6 Dimensions and tolerances.3
6.1 Diameters .3
6.2 Outer cover thickness.5
6.3 Concentricity.5
7 Physical properties .6
7.1 Fluid and UV resistance of thermoplastic compounds .6
7.2 Performance requirements.6
8 Frequency of testing .9
9 Marking.9
9.1 Hoses .9
9.2 Hose assemblies.9
10 Recommendations for packaging and storage .10
11 Test report.10
Annex A (normative) Type tests and routine tests.11
Annex B (informative) Production acceptance tests.12
Annex C (informative) Recommendations for lengths of supplied hoses and hose assemblies.13
Bibliography.14

© ISO 2008 – All rights reserved iii

---------------------- Page: 3 ----------------------
ISO 23297:2008(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 23297 was prepared by Technical Committee ISO/TC 45, Rubber and rubber products, Subcommittee
SC 1, Hoses (rubber and plastics).
iv © ISO 2008 – All rights reserved

---------------------- Page: 4 ----------------------
ISO 23297:2008(E)
Introduction
Based on the information received from plastics experts from the Netherlands and the UK, it was decided to
exclude, for the time being, the abrasion resistance tests for compounds and hose cover from this
International Standard.
However, the manufacturers of this product recognize the need for determining the abrasion resistance of the
hose cover, as the users require it. ISO 6945 is being revised to include a special test for this property and an
amendment to 7.2, setting standards of acceptability for performance of hoses, is planned.

© ISO 2008 – All rights reserved v

---------------------- Page: 5 ----------------------
INTERNATIONAL STANDARD ISO 23297:2008(E)

Thermoplastics hoses and hose assemblies — Wire or
synthetic yarn reinforced single-pressure types for hydraulic
applications — Specification
1 Scope
This International Standard specifies requirements for eight classes and two types (construction with adhesive
bond between layers and construction without adhesive bond between layers) of wire or synthetic yarn
reinforced hydraulic hoses and hose assemblies of nominal size from 3,2 to 31,5. Each class has a single
maximum working pressure for all sizes. Such hoses are suitable for use with hydraulic fluids HH, HL, HM, HR,
and HV as defined in ISO 6743-4 at temperatures ranging from −40 °C to +100 °C for grades A and B and
−40 °C to +120 °C for grades C and D.
This International Standard does not include requirements for end fittings. It is limited to the performance of
hoses and hose assemblies. The hose assembly maximum working pressure is governed by the lowest
maximum working pressure of the components.
NOTE It is the responsibility of the user, in consultation with the hose manufacturer, to establish compatibility of the
hose with the fluid to be used.
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 1746, Rubber or plastics hoses and tubing — Bending test
ISO 1817, Rubber, vulcanized — Determination of the effect of liquids
ISO 4671, Rubber and plastics hoses and hose assemblies — Methods of measurement of the dimensions of
hoses and the lengths of hose assemblies
ISO 4672:1997, Rubber and plastics hoses — Sub-ambient temperature flexibility tests
ISO 4892 (all parts), Plastics — Methods of exposure to laboratory light sources
ISO 6803, Rubber or plastics hoses and hose assemblies — Hydraulic-pressure impulse test without flexing
ISO 7233, Rubber and plastics hoses and hose assemblies — Determination of resistance to vacuum
ISO 7326:2006, Rubber and plastics hoses — Assessment of ozone resistance under static conditions
ISO 8033, Rubber and plastics hoses — Determination of adhesion between components
ISO 8330, Rubber and plastics hoses and hose assemblies — Vocabulary
ISO 8331, Rubber and plastics hoses and hose assemblies — Guidelines for selection, storage, use and
maintenance
© ISO 2008 – All rights reserved 1

---------------------- Page: 6 ----------------------
ISO 23297:2008(E)
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 8330 apply.
4 Classification
4.1 Classes
Eight classes of hose are specified, distinguished by their maximum working pressure, as shown in Table 1.
Each class may be manufactured in up to 10 nominal sizes.
Table 1 — Classes, nominal size and maximum working pressure
Class 35 70 140 210 280 350 420 560
a
MWP (bar) 35 70 140 210 280 350 420 560
a
MWP (MPa) 3,5 7 14 21 28 35 42 56
Nominal size
3,2 X X X X X X X X
5 X X X X X X X X
6,3 X X X X X X X X
8 X X X X X X X X
10 X X X X X X X X
12,5 X X X X X X X X
16 X X X X X X X X
19 X X X X X X X X
25 X X X X X X X X
31,5 X X X X X X X X
a
Maximum working pressure.

4.2 Types
Two types are specified according to their construction: type 1 with adhesion between the layers; and type 2
without adhesion between the layers. In type 1 hoses, the lining and cover are adhesively bonded (i.e. only
separable by force) to the reinforcement; in type 2 hoses, these layers are not attached to the reinforcement.
4.3 Grades
Hoses are classified according to their resistance to impulse into four grades: A, B, C and D, as shown in
Table 2.
Table 2 — Grades
Resistance to impulse
Grade
Temperature Impulse pressure Minimum number of
a
°C (% of MWP ) cycles
A 100 133 % 200 000
B 100 133 % 500 000
133 % (classes 35, 70, 140, 210)
C 120 500 000
120 % (classes 280, 350, 420, 560)
133 % (classes 35, 70, 140, 210)
D 120 1 000 000
120 % (classes 280, 350, 420, 560)
a
Maximum working pressure.
2 © ISO 2008 – All rights reserved

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ISO 23297:2008(E)
The maximum working pressure by class is shown in Table 3.
Table 3 — Maximum working pressure
Class 35 70 140 210 280 350 420 560
a
MWP (bar) 35 70 140 210 280 350 420 560
a
MWP (MPa) 3,5 7 14 21 28 35 42 56
Grade
A X X X X X X X X
B X X X X X X X X
C X X X X X X X X
D X X X X X X X X
NOTE X = Applicable.
a
Maximum working pressure.

5 Materials and construction
5.1 Hoses
Hoses shall consist of a hydraulic-fluid-resistant thermoplastic lining, one or multiple layers of steel wire or
synthetic yarn and an oil- and weather-resistant thermoplastic cover. Other protective materials over the
thermoplastic cover are allowed for improved abrasion or other resistance.
5.2 Hose assemblies
Hose assemblies shall only be manufactured with those hose fittings which conform to the requirements of
7.2.1, 7.2.4 and 7.2.5 of this International Standard.
Follow the manufacturer's instructions for proper preparation and fabrication of hose assemblies.
6 Dimensions and tolerances
6.1 Diameters
When measured in accordance with ISO 4671, the diameters of the hoses shall conform to the values given in
Table 4.

© ISO 2008 – All rights reserved 3

---------------------- Page: 8 ----------------------
ISO 23297:2008(E)
Table 4 — Diameters of hoses
Inside diameter Maximum outside diameter of hose
(all classes)
Nominal
mm mm
size
min. max. Class 35 Class 70 Class 140 Class 210 Class 280 Class 350 Class 420 Class 560
3,2 3,1 4,0 8 8 9 9,5 9,5 9,5 10,5 10,5
5 4,6 5,4 10 10 11 12 12 12 14 15
6,3 6,1 7,0 12 12 14 14 14 14 16 16
a
8 7,7 8,5 13 13 15,5 15,5 (16,6 ) 16 16 17 17
10 9,3 10,3 16 16 17,5 18,5 19 19 20 21
12,5 12,3 13,5 20 20 21 23 23 23 24 25
a
16 15,5 16,8 23 23 25 27 (28) 28 28 28 29
19 18,6 19,8 27 28 29 32 32 33 33 34
a
25 25,0 26,4 34 36 36 39 (40,4) 39 40,5 40,5 43,5
31,5 31,4 33,0 45 45 46 48 49 50 50 51,5
a
These dimensions are allowable for textile yarn braided reinforcement only; for metal
...

FINAL
INTERNATIONAL ISO/FDIS
DRAFT
STANDARD 23297
ISO/TC 45/SC 1
Thermoplastics hoses and hose
Secretariat: DSM
assemblies — Wire or synthetic yarn
Voting begins on:
reinforced single-pressure types for
2008-09-18
hydraulic applications — Specification
Voting terminates on:
2008-11-18
Tuyaux et flexibles en matière thermoplastique — Types hydrauliques à

pression unique, avec armature de fils métalliques ou synthétiques —
Spécifications


Please see the administrative notes on page iii

RECIPIENTS OF THIS DRAFT ARE INVITED TO
SUBMIT, WITH THEIR COMMENTS, NOTIFICATION
OF ANY RELEVANT PATENT RIGHTS OF WHICH
THEY ARE AWARE AND TO PROVIDE SUPPORT-
ING DOCUMENTATION.
IN ADDITION TO THEIR EVALUATION AS
Reference number
BEING ACCEPTABLE FOR INDUSTRIAL, TECHNO-
ISO/FDIS 23297:2008(E)
LOGICAL, COMMERCIAL AND USER PURPOSES,
DRAFT INTERNATIONAL STANDARDS MAY ON
OCCASION HAVE TO BE CONSIDERED IN THE
LIGHT OF THEIR POTENTIAL TO BECOME STAN-
DARDS TO WHICH REFERENCE MAY BE MADE IN
©
NATIONAL REGULATIONS. ISO 2008

---------------------- Page: 1 ----------------------
ISO/FDIS 23297:2008(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.


Copyright notice
This ISO document is a Draft International Standard and is copyright-protected by ISO. Except as permitted
under the applicable laws of the user's country, neither this ISO draft nor any extract from it may be
reproduced, stored in a retrieval system or transmitted in any form or by any means, electronic,
photocopying, recording or otherwise, without prior written permission being secured.
Requests for permission to reproduce should be addressed to 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 [e-mail]
Web www.iso.org
Reproduction may be subject to royalty payments or a licensing agreement.
Violators may be prosecuted.

ii © ISO 2008 – All rights reserved

---------------------- Page: 2 ----------------------
ISO/FDIS 23297:2008(E)
In accordance with the provisions of Council Resolution 15/1993, this document is circulated in the
English language only.

© ISO 2008 – All rights reserved iii

---------------------- Page: 3 ----------------------
ISO/FDIS 23297:2008(E)
Contents Page
Foreword. v
Introduction . vi
1 Scope. 1
2 Normative references . 1
3 Terms and definitions. 2
4 Classification. 2
4.1 Classes. 2
4.2 Types . 2
4.3 Grades . 2
5 Materials and construction . 3
5.1 Hoses. 3
5.2 Hose assemblies . 3
6 Dimensions and tolerances . 3
6.1 Diameters. 3
6.2 Outer cover thickness . 5
6.3 Concentricity . 5
7 Physical properties . 5
7.1 Fluid and UV resistance of thermoplastic compounds. 5
7.2 Performance requirements . 6
8 Frequency of testing. 8
9 Marking. 9
9.1 Hoses. 9
9.2 Hose assemblies . 9
10 Recommendations for packaging and storage. 9
11 Test report. 9
Annex A (normative) Type tests and routine tests . 10
Annex B (informative) Production acceptance tests . 11
Annex C (informative) Recommendations for lengths of supplied hoses and hose assemblies . 12
Bibliography . 13

iv © ISO 2008 – All rights reserved

---------------------- Page: 4 ----------------------
ISO/FDIS 23297:2008(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 23297 was prepared by Technical Committee ISO/TC 45, Rubber and rubber products, Subcommittee
SC 1, Hoses (rubber and plastics).
© ISO 2008 – All rights reserved v

---------------------- Page: 5 ----------------------
ISO/FDIS 23297:2008(E)
Introduction
Based on the information received from plastics experts from the Netherlands and the UK, it was decided to
exclude, for the time being, the abrasion resistance tests for compounds and hose cover from this
International Standard.
However, the manufacturers of this product recognize the need for determining the abrasion resistance of the
hose cover, as the users require it. ISO 6945 is being revised to include a special test for this property and an
amendment to 7.2, setting standards of acceptability for performance of hoses, is planned.

vi © ISO 2008 – All rights reserved

---------------------- Page: 6 ----------------------
FINAL DRAFT INTERNATIONAL STANDARD ISO/FDIS 23297:2008(E)

Thermoplastics hoses and hose assemblies — Wire or
synthetic yarn reinforced single-pressure types for hydraulic
applications — Specification
1 Scope
This International Standard specifies requirements for eight classes and two types (construction with adhesive
bond between layers and construction without adhesive bond between layers) of wire or synthetic yarn
reinforced hydraulic hoses and hose assemblies of nominal size from 3,2 to 31,5. Each class has a single
maximum working pressure for all sizes. Such hoses are suitable for use with hydraulic fluids HH, HL, HM, HR,
and HV as defined in ISO 6743-4 at temperatures ranging from −40 °C to +100 °C for grades A and B and
−40 °C to +120 °C for grades C and D.
This International Standard does not include requirements for end fittings. It is limited to the performance of
hoses and hose assemblies. The hose assembly maximum working pressure is governed by the lowest
maximum working pressure of the components.
NOTE It is the responsibility of the user, in consultation with the hose manufacturer, to establish compatibility of the
hose with the fluid to be used.
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 1746, Rubber or plastics hoses and tubing — Bending test
ISO 1817, Rubber, vulcanized — Determination of the effect of liquids
ISO 4671, Rubber and plastics hoses and hose assemblies — Methods of measurement of the dimensions of
hoses and the lengths of hose assemblies
ISO 4672:1997, Rubber and plastics hoses — Sub-ambient temperature flexibility tests
ISO 4892 (all parts), Plastics — Methods of exposure to laboratory light sources
ISO 6803, Rubber or plastics hoses and hose assemblies — Hydraulic-pressure impulse test without flexing
ISO 7233, Rubber and plastics hoses and hose assemblies — Determination of resistance to vacuum
ISO 7326:2006, Rubber and plastics hoses — Assessment of ozone resistance under static conditions
ISO 8033, Rubber and plastics hoses — Determination of adhesion between components
ISO 8330, Rubber and plastics hoses and hose assemblies — Vocabulary
ISO 8331, Rubber and plastics hoses and hose assemblies — Guidelines for selection, storage, use and
maintenance
© ISO 2008 – All rights reserved 1

---------------------- Page: 7 ----------------------
ISO/FDIS 23297:2008(E)
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 8330 apply.
4 Classification
4.1 Classes
Eight classes of hose are specified, distinguished by their maximum working pressure, as shown in Table 1.
Each class may be manufactured in up to 10 nominal sizes.
Table 1 — Classes, nominal size and maximum working pressure
Class 35 70 140 210 280 350 420 560
a
MWP (bar) 35 70 140 210 280 350 420 560
a
MWP (MPa) 3,5 7 14 21 28 35 42 56
Nominal size
3,2 X X X X X X X X
5 X X X X X X X X
6,3 X X X X X X X X
8 X X X X X X X X
10 X X X X X X X X
12,5 X X X X X X X X
16 X X X X X X X X
19 X X X X X X X X
25 X X X X X X X X
31,5 X X X X X X X X
a
Maximum working pressure.

4.2 Types
Two types are specified according to their construction: type 1 with adhesion between the layers; and type 2
without adhesion between the layers. In type 1 hoses, the lining and cover are adhesively bonded (i.e. only
separable by force) to the reinforcement; in type 2 hoses, these layers are not attached to the reinforcement.
4.3 Grades
Hoses are classified according to their resistance to impulse into four grades: A, B, C and D, as shown in
Table 2.
Table 2 — Grades
Resistance to impulse
Grade
Temperature Impulse pressure Minimum number of
a
°C (% of MWP ) cycles
A 100 133 % 200 000
B 100 133 % 500 000
133 % (classes 35, 70, 140, 210)
C 120 500 000
120 % (classes 280, 350, 420, 560)
133 % (classes 35, 70, 140, 210)
D 120 1 000 000
120 % (classes 280, 350, 420, 560)
a
Maximum working pressure.
2 © ISO 2008 – All rights reserved

---------------------- Page: 8 ----------------------
ISO/FDIS 23297:2008(E)
The maximum working pressure by class is shown in Table 3.
Table 3 — Maximum working pressure
Class 35 70 140 210 280 350 420 560
a
MWP (bar) 35 70 140 210 280 350 420 560
a
MWP (MPa) 3,5 7 14 21 28 35 42 56
Grade
A X X X X X X X X
B X X X X X X X X
C X X X X X X X X
D X X X X X X X X
NOTE X = Applicable.
a
Maximum working pressure.

5 Materials and construction
5.1 Hoses
Hoses shall consist of a hydraulic-fluid-resistant thermoplastic lining, one or multiple layers of steel wire or
synthetic yarn and an oil- and weather-resistant thermoplastic cover. Other protective materials over the
thermoplastic cover are allowed for improved abrasion or other resistance.
5.2 Hose assemblies
Hose assemblies shall only be manufactured with those hose fittings which conform to the requirements of
7.2.1, 7.2.4 and 7.2.5 of this International Standard.
Follow the manufacturer's instructions for proper preparation and fabrication of hose assemblies.
6 Dimensions and tolerances
6.1 Diameters
When measured in accordance with ISO 4671, the diameters of the hoses shall conform to the values given in
Table 4.

© ISO 2008 – All rights reserved 3

---------------------- Page: 9 ----------------------
ISO/FDIS 23297:2008(E)
4 © ISO 2008 – All rights reserved
Table 4 — Diameters of hoses
Inside diameter Maximum outside diameter of hose
(all classes)
Nominal
mm mm
size
min. max. Class 35 Class 70 Class 14
...