ISO 4081:2005
(Main)Rubber hoses and tubing for cooling systems for internal-combustion engines — Specification
Rubber hoses and tubing for cooling systems for internal-combustion engines — Specification
ISO 4081:2005 specifies the requirements for straight or pre-formed rubber hoses and tubing for use in pressurized or unpressurized cooling circuits containing 1,2-ethanediol-based coolants in internal-combustion engines for vehicles with an unladen mass of 3,5 t or less. In addition, this specification may also be applied as a classification system to enable original equipment manufacturers (OEMs) to detail a 'line call-out' of tests for specific applications where these are not covered by the main types specified. In this case, the hose or tubing would not carry any marking showing this ISO specification number but may detail the OEM's own identification markings as shown on their part drawings.
Tubes et tuyaux en caoutchouc pour systèmes de refroidissement pour moteurs à combustion interne — Spécifications
General Information
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Standards Content (Sample)
INTERNATIONAL ISO
STANDARD 4081
Second edition
2005-04-15
Rubber hoses and tubing for cooling
systems for internal-combustion
engines — Specification
Tubes et tuyaux en caoutchouc pour systèmes de refroidissement pour
moteurs à combustion interne — Spécifications
Reference number
ISO 4081:2005(E)
©
ISO 2005
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ISO 4081:2005(E)
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ii © ISO 2005 – All rights reserved
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ISO 4081:2005(E)
Contents Page
Foreword. iv
1 Scope. 1
2 Normative references. 1
3 Classification. 2
4 Sizes and tolerances. 2
5 Performance requirements for hose and tubing. 2
6 Frequency of testing. 4
7 Marking. 4
Annex A (normative) Dilation test. 5
Annex B (normative) Resistance to surface contamination by engine oil . 6
Annex C (normative) Pressure, vibration and temperature test. 7
Annex D (informative) Example of how a non-standard type of hose or tubing could be specified
by an original equipment manufacturer (OEM) using a matrix . 9
Annex E (normative) Type approval tests. 10
Annex F (normative) Routine tests.11
Annex G (informative) Production acceptance tests . 12
© ISO 2005 – All rights reserved iii
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ISO 4081:2005(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 4081 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 (ISO 4081:1987), which has been technically revised.
iv © ISO 2005 – All rights reserved
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INTERNATIONAL STANDARD ISO 4081:2005(E)
Rubber hoses and tubing for cooling systems for internal-
combustion engines — Specification
WARNING — Persons using this International Standard should be familiar with normal laboratory
practice. This standard 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 International Standard specifies the requirements for straight or pre-formed rubber hoses and tubing for
use in pressurized or unpressurized cooling circuits containing 1,2-ethanediol-based coolants in internal-
combustion engines for vehicles with an unladen mass (as defined in ISO 1176) of 3,5 t or less. In addition,
this specification may also be applied as a classification system to enable original equipment manufacturers
(OEMs) to detail a “line call-out” of tests for specific applications where these are not covered by the main
types specified (see example in Annex D). In this case, the hose or tubing would not carry any marking
showing this ISO specification number but may detail the OEM's own identification markings as shown on
their part drawings.
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 188, Rubber, vulcanized or thermoplastic — Accelerated ageing and heat resistance tests
ISO 1176, Road vehicles — Masses — Vocabulary and codes
ISO 1307, Rubber and plastics hoses for general-purpose industrial applications — Bore diameters and
tolerances, and tolerances on length
ISO 1402, Rubber and plastics hoses and hose assemblies — Hydrostatic testing
ISO 1746, Rubber or plastics hoses and tubing — Bending tests
ISO 1817, Rubber, vulcanized — Determination of the effect of liquids
ISO 4672:1997, Rubber and plastics hoses — Sub-ambient temperature flexibility tests
ISO 6162-1, Hydraulic fluid power — Flange connectors with split or one-piece flange clamps and metric or
inch screws — Part 1: Flange connectors for use at pressures of 3,5 MPa (35 bar) to 35 MPa (350 bar),
DN 13 to DN 127
ISO 7233, Rubber and plastics hoses and hose assemblies — Determination of suction resistance
ISO 7326:1991, Rubber and plastics hoses — Assessment of ozone resistance under static conditions
ISO 8033, Rubber and plastics hoses — Determination of adhesion between components
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ISO 4081:2005(E)
ISO 23529, Rubber — General procedures for preparing and conditioning test pieces for physical test
methods
SAE J20:2004, Coolant System Hoses
SAE J1638, Compression Set of Hoses or Solid Discs
SAE J1684:2000, Test Method for Evaluating the Electrochemical Resistance of Coolant System Hoses and
Materials
3 Classification
The product shall consist of rubber materials with or without an integral reinforcement which may or may not
be pre-formed before final vulcanization. The hoses and tubing may be branched, in which case the method of
attachment of the branch shall be such that the integrity of the hose is maintained when it is tested to this
International Standard. This International Standard does not cover methods of attachment to mounting spigots.
Four types of hose and tubing for specific applications are specified, as follows:
Type 1 = Tubing and hoses for ambient operating temperatures from –40 °C to +100 °C
Type 2 = Tubing and hoses for ambient operating temperatures from –40 °C to +125 °C
Type 3 = Tubing and hoses for ambient operating temperatures from –40 °C to +150 °C
Type 4 = Tubing and hoses for ambient operating temperatures from –40 °C to +175 °C
Wherever economically and technically possible, hoses and tubing shall use in their construction materials
that are capable of being recycled. Also, wherever economically and technically possible, hoses and tubing
shall use in their construction materials that contain post-consumer or post-industrial recyclates.
4 Sizes and tolerances
Bore sizes and tolerances shall be in accordance with ISO 1307. Wall thicknesses shall be sufficient to meet
the requirements of this International Standard.
5 Performance requirements for hose and tubing
Tests shall be selected from the following list for each application of hose or tubing, based on the performance
requirements of the finished product. Type approval tests (as defined in Clause 7) for each hose or tubing type
are given in Annex E.
a) Burst pressure: When determined in accordance with ISO 1402 at standard laboratory temperature as
specified in ISO 23529, the minimum burst pressure shall be:
Tubing: 2 bar (0,2 MPa) for all diameters
Hose: 12 bar (1,2 MPa) for diameters up to and including 18 mm
9 bar (0,9 MPa) for diameters >18 mm up to and including 35 mm
5 bar (0,5 MPa) for diameters >35 mm
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ISO 4081:2005(E)
b) Adhesion (for all constructions with two or more bonded layers only): When determined by the
appropriate procedure of ISO 8033, the adhesion between each pair of bonded layers shall not be less
than 1,75 kN/m for unaged hoses and not less than 1,25 kN/m for hoses aged as specified
...
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