ISO 18752:2012
(Main)Rubber hoses and hose assemblies — Wire- or textile-reinforced single-pressure types for hydraulic applications — Specification
Rubber hoses and hose assemblies — Wire- or textile-reinforced single-pressure types for hydraulic applications — Specification
Tuyaux et flexibles en caoutchouc — Types hydrauliques avec armature de fils métalliques tressés — Spécifications
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Standards Content (Sample)
INTERNATIONAL ISO
STANDARD 18752
Second edition
2012-11-01
Rubber hoses and hose assemblies —
Wire- or textile-reinforced single-
pressure types for hydraulic
applications — Specification
Tuyaux et flexibles en caoutchouc — Types hydrauliques avec
armature de fils métalliques tressés — Spécifications
Reference number
ISO 18752:2012(E)
©
ISO 2012
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ISO 18752:2012(E)
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© ISO 2012
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ii © ISO 2012 – All rights reserved
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ISO 18752:2012(E)
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Classification . 2
4.1 Classes . 2
4.2 Grades and types . 2
5 Materials and construction . 3
5.1 Hoses . 3
5.2 Hose assemblies . 3
6 Dimensions and tolerances . 4
6.1 Diameters . 4
6.2 Cover thickness . 6
6.3 Concentricity. 6
7 Physical properties . 6
7.1 Fluid resistance of rubber compounds . 6
7.2 Performance requirements . 7
8 Frequency of testing .10
9 Marking .10
9.1 Hoses .10
9.2 Hose assemblies .10
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 tolerances on lengths of hose assemblies .13
Annex D (informative) Information to be provided by hose manufacturer .14
Bibliography .15
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ISO 18752:2012(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 18752 was prepared by Technical Committee ISO/TC 45, Rubber and rubber products, Subcommittee
SC 1, Hoses (rubber and plastics).
This second edition cancels and replaces the first edition, of which Clause 4.1, Tables 1, 3, 4 and 8, and
Annexes C and D have been technically revised.
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INTERNATIONAL STANDARD ISO 18752:2012(E)
Rubber hoses and hose assemblies — Wire- or
textile-reinforced single-pressure types for hydraulic
applications — Specification
1 Scope
This International Standard specifies requirements for ten classes, four grades and seven types of wire-
or textile-reinforced hydraulic hoses and hose assemblies of nominal sizes ranging from 5 to 102. 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 types AS, AC, BS and BC and – 40 °C to + 120 °C for types CS, CC and DC.
This International Standard does not include requirements for the connection ends. 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 the
compatibility of the hose with the fluid to be used.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and are
indispensable for its application. 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 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 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 8033:2006, 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 10619-1, Rubber and plastics hoses and tubing — Measurement of flexibility and stiffness — Part 1:
Bending tests at ambient temperature
ISO 10619-2:2011, Rubber and plastics hoses and tubing — Measurement of flexibility and stiffness —
Part 2: Bending tests at sub-ambient temperatures
ISO 17165-1, Hydraulic fluid power — Hose assemblies — Part 1: Dimensions and requirements
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 8330 apply.
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ISO 18752:2012(E)
4 Classification
4.1 Classes
Ten classes of hose are specified, distinguished by their maximum working pressure, as shown in Table 1.
Each class may be manufactured up to 14 nominal sizes.
Table 1 — Classes and nominal sizes
Class 35 70 140 210 250 280 350 420 490 560
a
MWP (MPa) 3,5 7 14 21 25 28 35 42 49 56
a
MWP (bar) 35 70 140 210 250 280 350 420 490 560
Nominal size
5 X X X X X X X X N/A N/A
6,3 X X X X X X X X N/A N/A
8 X X X X X X X X N/A N/A
10 X X X X X X X X N/A N/A
12,5 X X X X X X X X N/A N/A
16 X X X X X X X X X X
19 X X X X X X X X X X
25 X X X X X X X X X X
31,5 X X X X X X X X X X
38 X X X X X X X X N/A N/A
51 X X X X X X X X N/A N/A
63 X X X X X X X N/A N/A N/A
76 X X X N/A N/A N/A N/A N/A N/A N/A
102 X N/A N/A N/A N/A N/A N/A N/A N/A N/A
NOTE X = Applicable; N/A = Not applicable.
a
Maximum working pressure.
4.2 Grades and types
Hoses are classified into four grades according to their resistance to impulse: A, B, C and D. Each grade
is classified by outside diameter into standard types (AS, BS and CS) and compact types (AC, BC, CC and
DC), as shown in Table 2.
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ISO 18752:2012(E)
Table 2 — Grades and types
Resistance to impulse
a
Grade Type
Temperature Impulse pressure Minimum number of
b
°C (% of MWP ) cycles
AS
A 100 133 % 200 000
AC
BS
B 100 133 % 500 000
BC
CS
c
C 120 133 % and 120 % 500 000
CC
D DC 120 133 % 1 000 000
a
Standard or compact, e.g. CS is grade C and standard type.
As shown in Table 4 and Table 8, standard types have larger outside diameters and larger bend radii while compact types
have smaller outside diameters and smaller bend radii.
b
Maximum working pressure.
c
120 % of the MWP shall be used for classes 350, 420, 490 and 560 instead of 133 %.
Each class includes one of each type or both, as shown in Table 3.
Table 3 — Type and maximum working pressure
Class 35 70 140 210 250 280 350 420 490 560
a
MWP (MPa) 3,5 7 14 21 25 28 35 42 49 56
a
MWP (bar) 35 70 140 210 250 280 350 420 490 560
Grade Type
AS X X X X X X X X N/A N/A
A
AC X X X X X X X X N/A N/A
BS X X X X X X X X N/A N/A
B
BC X X X X X X X X N/A N/A
CS N/A N/A N/A X X X X X N/A N/A
C
CC N/A N/A N/A X X X X X X X
D DC N/A N/A N/A X X X X X N/A N/A
NOTE X = Applicable; N/A = Not applicable.
a
Maximum working pressure.
5 Materials and construction
5.1 Hoses
Hoses shall consist of a hydraulic-fluid-resistant rubber lining, one or multiple layers of steel wire or
textile and an oil-, abrasion- and weather-resistant rubber cover. A layer of other materials on the rubber
cover is allowed for improved resistance to abrasion.
5.2 Hose assemblies
Hose assemblies shall only be manufactured using hose fittings which conform to the requirements of
7.2.1, 7.2.4 and 7.2.5 of this International Standard.
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ISO 18752:2012(E)
Follow the manufacturer’s instructions for the proper preparation and fabrication of hose assemblies.
6 Dimensions and tolerances
6.1 Diameters
When measured in accordance with ISO 4671, the diameters of hoses shall conform to the values
given in Table 4.
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ISO 18752:2012(E)
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Table 4 — Diameters of hoses
Inside diam- Maximum outside diameter of hose
eter mm
Nom-
(all classes)
inal Class 35 Class 70 Class 140 Class 210 Class 250 Class 280 Class 350 Class 420 Class 490 Class 5
...
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