ISO 19013-2:2005
(Main)Rubber hoses and tubing for fuel circuits for internal combustion engines — Specification — Part 2: Gasoline fuels
Rubber hoses and tubing for fuel circuits for internal combustion engines — Specification — Part 2: Gasoline fuels
ISO 19013-2:2005 specifies the requirements for rubber tubing and hoses used in gasoline fuel circuits for internal combustion engines. The gasoline fuels covered include those containing oxygenates such as methanol and methyl tertiary-butyl ether (MTBE) and fuels that have become oxidized ('sour gas'). 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 the number of this part of ISO 19013 but may detail the OEM's own identification markings as shown on their part drawings.
Tuyaux de caoutchouc et flexibles pour les circuits de carburant pour les moteurs à combustion interne — Spécifications — Partie 2: Essences
General Information
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Standards Content (Sample)
INTERNATIONAL ISO
STANDARD 19013-2
First edition
2005-03-15
Rubber hoses and tubing for fuel circuits
for internal combustion engines —
Specification —
Part 2:
Gasoline fuels
Tuyaux de caoutchouc et flexibles pour les circuits de carburant pour
les moteurs à combustion interne — Spécifications —
Partie 2: Essences
Reference number
ISO 19013-2:2005(E)
©
ISO 2005
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ISO 19013-2:2005(E)
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ii © ISO 2005 – All rights reserved
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ISO 19013-2:2005(E)
Contents Page
Foreword. iv
1 Scope. 1
2 Normative references. 1
3 Classification. 2
4 Sizes. 3
5 Performance requirements for hose and tubing. 4
6 Frequency of testing. 6
7 Marking. 7
Annex A (normative) Cleanliness and extractables test . 8
Annex B (normative) Resistance of tubing to tearing . 10
Annex C (normative) Method for determining the resistance to surface contamination. 13
Annex D (normative) Preparation of peroxidized test fuel. 14
Annex E (normative) Copper corrosion and crystalline salt formation. 18
Annex F (normative) Life-cycle test. 19
Annex G (informative) Example of how a non-standard type of hose or tubing could be specified
by an original equipment manufacturer (OEM) using a matrix . 20
Annex H (normative) Type approval tests (as defined in Clause 6) . 21
Annex I (normative) Routine tests (as defined in Clause 6). 22
Annex J (informative) Production acceptance tests. 23
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ISO 19013-2:2005(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 19013-2 was prepared by Technical Committee ISO/TC 45, Rubber and rubber products, Subcommittee
SC 1, Hoses (rubber and plastics).
Together with Part 1 (see below), this part of ISO 19013 cancels and replaces ISO 4639-1:1987,
ISO 4639-2:1995 and ISO 4639-3:1995, which have been technically revised.
ISO 19013 consists of the following parts, under the general title Rubber hoses and tubing for fuel circuits for
internal combustion engines — Specification:
Part 1: Diesel fuels
Part 2: Gasoline fuels
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INTERNATIONAL STANDARD ISO 19013-2:2005(E)
Rubber hoses and tubing for fuel circuits for internal
combustion engines — Specification —
Part 2:
Gasoline fuels
WARNING — Persons using this part of ISO 19013 should be familiar with normal laboratory practice.
This part of ISO 19013 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 19013 specifies the requirements for rubber tubing and hoses used in gasoline fuel circuits for
internal combustion engines. The gasoline fuels covered include those containing oxygenates such as
methanol and methyl tertiary-butyl ether (MTBE) and fuels that have become oxidized (“sour gas”). 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 G). In this case, the hose or tubing would not carry any marking
showing the number of this part of ISO 19013 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 1402, Rubber and plastics hoses and hose assemblies — Hydrostatic testing
ISO 1629, Rubber and latices — Nomenclature
ISO 1746, Rubber or plastics hoses and tubing — Bending tests
ISO 1817, Rubber, vulcanized — Determination of the effect of liquids
ISO 3302-1, Rubber — Tolerances for products — Part 1: Dimensional tolerances
ISO 4671, Rubber and plastics hoses and hose assemblies — Methods of measurement of dimensions
ISO 4672:1997, Rubber and plastics hoses — Sub-ambient temperature flexibility tests
ISO 4926, Road vehicles — Hydraulic brake systems — Non-petroleum base reference fluids
ISO 6133, Rubber and plastics — Analysis of multi-peak traces obtained in determinations of tear strength
and adhesion strength
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ISO 19013-2:2005(E)
ISO 7233:1991, 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 8031, Rubber and plastics hoses and hose assemblies — Determination of electrical resistance
ISO 8033, Rubber and plastics hoses — Determination of adhesion between components
ISO 23529, Rubber — General procedures for preparing and conditioning test pieces for physical test
methods
SAE J1737, Test Procedure to Determine the Hydrocarbon Losses From Fuel Tubes, Hoses, Fittings, and
Fuel Line Assemblies By Recirculation
SAE J2027:1998, Standard for Protective Covers for Gasoline Fuel Line Tubing
SAE J2044:2002, Quick Connect Coupling Specification for Liquid Fuel and Vapor/Emissions Systems
SAE J2260, Nonmetallic Fuel System Tubing with One or More Layers
ASTM D 130, Standard Test Method for Corrosiveness to Copper from Petroleum Products by Copper Strip
Test
3 Classification
The product shall consist of extruded rubber materials with or without an integral internal or external
reinforcement which may or may not be pre-formed before final vulcanization. The product may also have a
rubber or thermoplastic barrier layer, either as an internal layer or forming the inner liner, to impart improved
fuel resistance and/or reduced fuel vapour permeability.
Fourteen hoses and tubings for specific applications are as specified, as follows:
Type 1 Class A = Pressurized [7 bar (0,7 MPa) working pressure] feed and return lines from the fuel tank to
the engine compartment (−40 °C to +80 °C continuous)
Class B = Pressurized [2 bar (0,2 MPa) working pressure] feed and return lines from the fuel tank to
the engine compartment (−40 °C to +80 °C continuous)
Type 2 Class A = Pressurized [7 bar (0,7 MPa) working pressure] feed and return lines in the engine
compartment (−40 °C to +100 °C continuous)
Class B = Pressurized [2 bar (0,2 MPa) working pressure] feed and return lines in the engine
compartment (−40 °C to +100 °C continuous)
Type 3 Class A = Pressurized [7 bar (0,7 MPa) working pressure] feed and return lines in the engine
compartment (−40 °C to +125 °C continuous)
Class B = Pressurized [2 bar (0,2 MPa) working pressure] feed and return lines in the engine
compartment (−40 °C to +125 °C continuous)
Type 4 Low pressure [1,2 bar (0,12 MPa) working pressure] fuel filler, vent and vapour handling
(−40 °C to +80 °C continuous)
All types and classes can also be designated reduced fuel vapour permeable (RP), e.g. Type 1 Class A RP.
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ISO 19013-2:2005(E)
4 Sizes
4.1 Tubing
When determined by the methods described in ISO 4671, internal diameters and wall thicknesses shall be as
specified in Table 1.
Tolerances shall be selected from the appropriate categories specified in ISO 3302-1: M3 for moulded hoses:
E2 for extrusions.
The thickness of the barrier layer, where applicable, shall be included in the total nominal wall thickness
shown in Table 1.
Table 1 — Tubing internal diameters and wall thicknesses
Internal diameter Wall thickness
mm mm
3,5 3,5
4 3,5
5 4
7 4,5
9 4,5
11 4,5
13 4,5
NOTE For information, the unions on which the tubing is to be fitted have the following diameters: 4 mm, 4,5 mm,
6 mm or 6,35 mm, 8 mm, 10 mm, 12 mm and 14 mm.
4.2 Hoses
When determined by the methods described in ISO 4671, the dimensions and concentricity of hoses shall
comply with Tables 2 and 3.
The thickness of the barrier layer, where applicable, shall be included in the total nominal wall thickness
shown in Table 2.
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ISO 19013-2:2005(E)
Table 2 — Hose dimensions
Dimensions in millimetres
Internal diameter Tolerance Wall thickness Outside diameter Tolerance
3,5 ± 0,3 3 9,5 ± 0,4
4 ± 0,3 3 10 ± 0,4
5 ± 0,3 3 11 ± 0,4
6 ± 0,3 3 12 ± 0,4
7 ± 0,3 3 13 ± 0,4
7,5 ± 0,3 3 13,5 ± 0,4
8 ± 0,3 3 14 ± 0,4
9 ± 0,3 3 15 ± 0,4
11 ± 0,3 3,5 18 ± 0,4
12 ± 0,3 3,5 19 ± 0,4
13 ± 0,4 3,5 20 ± 0,6
16 ± 0,4 4 24 ± 0,6
21 ± 0,4 4 29 ± 0,6
+0,5
31,5 4,25 40 ± 1
−1
+0,5
40 5 50 ± 1
−1
Table 3 — Hose concentricity
Internal diameter Maximum variation from concentricity
mm mm
Up to and including 3,5 0,4
Over 3,5 0,8
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 for the finished product. Type approval tests (as defined in Clause 7) for each hose or tubing
group are given in Annex H.
a) Burst pressure: When determined in accordance with ISO 1402, the minimum burst pressure for
Types 1, 2 and 3, Class A, shall be 30 bar gauge (3,0 MPa) and for Class B shall be 12 bar gauge
(1,2 MPa). Type 4 shall be 5 bar gauge (0,5 MPa). Additionally, after fuel resistance testing [test m)],
hoses and tubing shall not have a burst pressure of less than 75 % of the original burst pressure.
b) Adhesion (for all constructions with two or more bonded layers only): When determined by the
appropriate procedure in ISO 8033, the adhesion between each pair of bonded layers shall not be less
than 1,5 kN/m.
c) Low-temperature flexibility: When tested in accordance with ISO 4672:1997, procedure B, a length of
hose or tubing which has been previously kept filled with ISO 1817 liquid C for 72 h ± 2 h at 21 °C ± 2 °C
and then kept cooled at −40 °C ± 2 °C for 72 h ± 2 h shall not exhibit any cracking when examined under
× 2 magnification after bending around a similarly cooled mandrel the radius of which is 12 times the
nominal bore size of the hose or 25 times the nominal bore size of the tubing. The hose or tubing shall
then conform to the burst strength requirement of test a).
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ISO 19013-2:2005(E)
d) Internal cleanliness: When determined in accordance with Annex A, the insoluble impurities shall not
2 2
exceed 5 g/m and the fuel-soluble impurities shall not exceed 3 g/m .
e) Extractable waxy materials: When determined in accordance with Annex A, the extractable waxy
2
materials shall not exceed 2,5 g/m .
f) Tear resistance (applicable to tubing only): When determined in accordance to Annex B, the minimum
tear resistance shall be 4,5 kN/m.
g) Ozone resistance: When tested in accordance with method 1 of ISO 7326:1991 under the following
conditions, the hose or tubing shall not show cracking when examined under × 2 magnification:
Partial pressure of ozone 50 mPa ± 3 mPa
Duration 72 h ± 2 h
Temperature 40 °C ± 2 °C
Elongation 20 %
h) Heat ageing resistance: After ageing for one or more of the following times and temperatures in
accordance with ISO 188, all constructions shall meet the adhesion requirements of test b), the low-
temperature flexibility requirements of test c) and the ozone resistance requirements of test g):
1) 1 000 h at 80 °C
2) 1 000 h at 100 °C
3) 1 000 h at 125 °C
4) 168 h at 100 °C
5) 168 h at 125 °C
6) 168 h at 140 °C
NOTE The 1 000 h tests represent long-term working temperatures and the 168 h tests represent short-term
peak working temperatures.
i) Resistance to surface contamination by engine oil: When tested in accordance with Annex C using
ISO 1817 oil 3, all constructions shall meet the adhesion requirements of test b), the cold flexibility
requirements of test c) and the ozone resistance requirements of test g).
j) Resistance to surface contamination by non-petroleum hydraulic (brake/clutch) fluid: When tested
in accordance with Annex C using hydraulic fluid to ISO 4926, all constructions shall meet the adhesion
requirements of test b), the cold flexibility requirements of test c) and the ozone resistance requirements
of test g).
k) Resistance to kinking (this requirement applies only to straight hoses and tubing with a nominal bore
size of 16 mm or less): When determined in accordance with ISO 1746, the maximum coefficient of
deformation (T/D) shall not exceed 0,7. The mandrel diameter shall be 140 mm for hoses and tubing up to
nominal bore 11 mm, and 220 mm for hoses and tubing of nominal bore from 12 mm to 16 mm.
l) Resistance to suction (this requirement applies only to straight hoses and tubing): When the hose or
tubing is tested in accordance with ISO 7233:1991, procedure A, at 0,8 bar absolute (0,08 MPa) for 15 s
to 60 s duration with a ball of diameter 0,8 × the nominal bore, the ball shall traverse the full length of the
hose or tubing.
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ISO 19013-2:2005(E)
m) Resistance to fuels: When tested by the methanol fuel resistance test of SAE J2260, for a test duration
of 5 000 h using one or more of the following test fuels at a fuel temperature of 60 °C ± 2 °C, all
constructions shall meet the adhesion requirements of test b), the cold flexibility requirements of test c),
the ozone resistance requirements of test g), the kinking resistance of test k) and the suction resistance
of test l):
1) A mixture of 85 % by volume of liquid C (ISO 1817) and 15 % by volume of methanol.
2) A mixture of 75 % by volume of liquid C (ISO 1817) and 25 % by volume of methanol.
3) A mixture of 50 % by volume of liquid C (ISO 1817) and 50 % by volume of methanol.
4) A mixture of 85 % by volume of methanol and 15 % by volume of liquid C (ISO 1817).
5) A mixture of 85 % by volume of liquid C (ISO 1817) and 15 % by volume of methyl tertiary-butyl ether.
6) A mixture of 65 % by volume of liquid C (ISO 1817), 20 % by volume of methanol and 15 % by
volume of methyl tertiary-butyl ether.
7) 100 % by volume of methanol.
8) A mixture prepared in accordance with Annex D and peroxidized to a peroxide number of 90.
Recheck the peroxide number of the test fuel using the method given in Clause D.5 of Annex D after
each 70 h of testing. If the peroxide number falls below 80, replace the test fuel with fresh test fuel.
n) Burn-through resistance: When tested by the burn-through resistance test specified in SAE J2027, the
hose or tubing shall withstand a minimum of 60 s exposure to flame without loss of pressure.
o) Fuel permeability by recirculation (RP hoses and tubing only): When determined in accordance with
SAE J1737, the permeability to a mixture of 75 % by volume of liquid C (ISO 1817) and 25 % by volume
2
of methanol at 60 °C and 13,8 kPa shall not exceed 60 g/m /24 h.
p) Electrical resistance: When determined in accordance with ISO 8031, the electrical resistance shall not
exceed 10 MΩ.
q) Copper corrosion and crystalline salt formation: When tested in accordance with Annex E, there shall
be no tarnish on the copper strip greater than ASTM D 130 classification 1. Nor shall there be any
formation of crystalline material on the copper strip, on the inner liner material or on the bottom of the test
tube.
r) Life-cycle test (types 1, 2 and 3 only): When tested in accordance with Annex F, hose and tubing shall
meet the adhesion requirements of test b), the cold flexibility requirements of test c) and the ozone
resistance requirements of test g).
6 Frequency of testing
Type approval and routine tests are specified in Annex H and Annex I, respectively.
Type approval is obtained by the manufacturer supplying evidence that all requirements of this part of
ISO 19013 are met by the method of manufacture and the hose design. The tests shall be repeated at a
maximum of five-year intervals, or whenever a change in the method of manufacture or the materia
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