ISO 4642-2:2009

INTERNATIONAL ISO
STANDARD 4642-2
First edition
2009-02-15


Rubber and plastics hoses,
non-collapsible, for fire-fighting
service —
Part 2:
Semi-rigid hoses (and hose assemblies)
for pumps and vehicles
Tuyaux en caoutchouc et en plastique, non aplatissables, pour la lutte
contre l'incendie —
Partie 2: Tuyaux (et flexibles) semi-rigides pour pompes et véhicules





Reference number
ISO 4642-2:2009(E)
©
ISO 2009

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ISO 4642-2:2009(E)
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©  ISO 2009
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ISO 4642-2:2009(E)
Contents Page
Foreword. v
Introduction . vi
1 Scope . 1
2 Normative references . 1
3 Terms and definitions. 2
4 Classification. 2
4.1 General. 2
4.2 Classification by types (hose construction) . 2
4.3 Classification by class (materials for lining and cover) . 3
4.4 Classification by category . 3
5 Dimensions, tolerances and maximum mass. 3
5.1 Inside diameter and maximum mass. 3
5.2 Length and tolerances on length . 4
5.3 Concentricity . 4
6 Performance requirements of finished hose . 4
6.1 Hydrostatic requirements . 4
6.2 Adhesion. 5
6.3 Accelerated ageing. 5
6.4 Abrasion resistance. 5
6.5 Low temperature flexibility . 6
6.6 Hot surface resistance . 6
6.7 Ozone resistance . 6
6.8 Bending and crush resistance . 6
6.9 UV resistance (xenon arc lamp) . 6
6.10 Loss in mass on heating. 6
6.11 Deformation under crushing (type C only) .6
6.12 Hose assemblies. 7
7 Frequency of testing. 7
8 Type tests . 7
9 Test report . 7
10 Recommendation for packaging and storage . 7
11 Marking . 8
Annex A (normative) Kink pressure test. 9
Annex B (normative) Accelerated ageing test . 10
Annex C (normative) Surface abrasion resistance test . 11
Annex D (normative) Point abrasion resistance test. 13
Annex E (normative) Hot surface resistance test . 16
Annex F (normative) Bending and crush resistance test . 21
Annex G (normative) Deformation under crushing test. 23
Annex H (normative) Test for hose assemblies. 25
Annex I (normative) Type test and routine test. 26
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ISO 4642-2:2009(E)
Annex J (informative) Production tests. 27
Bibliography . 28

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ISO 4642-2:2009(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 4642-2 was prepared by Technical Committee ISO/TC 45, Rubber and rubber products, Subcommittee
SC 1, Hoses (rubber and plastics).
This first edition, together with ISO 4642-1, cancels and replaces ISO 4642:1978 which has been technically
revised.
ISO 4642 consists of the following parts, under the general title Rubber and plastics hoses, non-collapsible,
for fire-fighting service:
⎯ Part 1: Semi-rigid hoses for fixed systems
⎯ Part 2: Semi-rigid hoses (and hose assemblies) for pumps and vehicles
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ISO 4642-2:2009(E)
Introduction
This document is mainly concerned with fire service semi-rigid delivery hoses and incorporates those hoses
used manually to control and extinguish fires.

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INTERNATIONAL STANDARD ISO 4642-2:2009(E)

Rubber and plastics hoses, non-collapsible, for fire-fighting
service —
Part 2:
Semi-rigid hoses (and hose assemblies) for pumps
and vehicles
1 Scope
This part of ISO 4642 specifies the requirements and test methods for semi-rigid reel hoses for use on
fire-fighting vehicles and trailer pumps. The hoses are intended for use at a maximum working pressure of
1,5 MPa for normal pressure hoses (category I) and 4,0 MPa for high pressure hoses (category II). The hoses
are further subdivided into types and classes (see Clause 4).
This part of ISO 4642 applies to delivery hoses for fire-fighting purposes intended for use at a minimum
ambient temperature of −20 °C.
Hoses conforming to this part of ISO 4642 should be used with fire hose couplings conforming to the relevant
national standards couplings.
Requirements are also given for hose assemblies (see 6.12) where these are fitted by the hose manufacturer.
NOTE 1 Hoses for use at temperatures lower than −20 °C can be supplied by agreement between the manufacturer
and purchaser.
NOTE 2 All pressures are expressed in megapascals where 1 MPa = 10 bar.
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 176:2005, Plastics — Determination of loss of plasticizers — Activated carbon method
ISO 188, Rubber, vulcanized or thermoplastic — Accelerated ageing and heat resistance tests
ISO 1307, Rubber and plastics hoses — Hose sizes, minimum and maximum inside diameters, and
tolerances on cut-to-length hoses
ISO 1402, Rubber and plastics hoses and hose assemblies — Hydrostatic testing
ISO 4671:2007, 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
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ISO 4642-2:2009(E)
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
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 8330 and the following apply.
3.1
semi-rigid hose
hose that maintains its round cross-section even when unpressurized
4 Classification
4.1 General
All types and classes of hose shall be so flexible that they can be rolled and kept on a drum of minimum
diameter 200 mm for 12 mm inside diameter, 19 mm inside diameter and 25 mm inside diameter hose and of
minimum diameter 280 mm for 33 mm inside diameter hose.
Hoses shall be one of two categories distinguished by the maximum working pressure. Each hose shall be
further divided into one of three types distinguished by its construction, and then into six classes distinguished
by the materials used for lining and cover.
NOTE The hose can be coloured by agreement between the purchaser and the manufacturer.
4.2 Classification by types (hose construction)
4.2.1 Type A hoses shall consist of:
a) a seamless rubber or plastics lining;
b) a textile spiral or braided reinforcement;
c) a rubber or plastics cover.
4.2.2 Type B hoses shall consist of:
a) a seamless rubber or plastics lining;
b) a circular woven textile reinforcement with a rigid spiral helix;
c) an uncovered or rubber or plastics cover.
4.2.3 Type C hoses shall consist of:
a) a seamless rubber or plastics lining;
b) any suitable reinforcement;
c) a rubber or plastics cover.
NOTE Whilst the construction of type A and type C hoses can be similar or even identical, the performance
requirements differ for the following: burst and proof pressure, adhesion, hot surface resistance, crush resistance.
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ISO 4642-2:2009(E)
4.3 Classification by class (materials for lining and cover)
The hose types shall be further subdivided into six classes dependent on the materials used in their
construction, in accordance with Table 1.
Table 1 — Classes and materials
Class Lining material Cover material
1 rubber rubber
2 plastics plastics
3 rubber plastics
4 plastics rubber
5 rubber no cover
6 plastics no cover
4.4 Classification by category
All hoses shall be divided into two categories dependent on the maximum working pressure, in accordance
with Table 2.
Table 2 — Maximum working pressure, proof pressure and minimum burst pressure
Type of pressure Category I Category II
Types A and B Types A and B Type C
MPa
Classes 1 to 6 Classes 1 to 6 Classes 1 to 6
Maximum working pressure 1,5 4,0 4,0
Proof pressure 3,0 6,0 8,0
Minimum burst pressure 4,7 10,0 12,0
EXAMPLE A type C hose, constructed with a rubber lining and rubber cover and which has a maximum working
pressure of 4,0 MPa, a proof pressure of 8,0 MPa and a minimum burst pressure of 12,0 MPa is classified as II/C/1.
5 Dimensions, tolerances and maximum mass
5.1 Inside diameter and maximum mass
The inside diameter of the hose and tolerances, when measured in accordance with ISO 4671, using any
suitable method stated in Clause 4 of ISO 4671:2007, shall conform to the requirements given in Table 3. The
mass per metre length of the hose shall be in accordance with Table 3.
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ISO 4642-2:2009(E)
Table 3 — Inside diameter, tolerances on inside diameter and maximum mass per unit length
Inside diameter Tolerances for inside diameter Mass per unit length
mm mm kg/m
Types A and C Type B Types A and C Type B
 max. max.
12 0 to +0,6 — 0,30 —
19 0 to +0,9 0 to +1,5 0,75 0,25
25 0 to +1,2 0 to +1,5 0,90 0,35
33 0 to +1,6 0 to +2,0 1,00 0,50

5.2 Length and tolerances on length
The total length of hose supplied shall be in accordance with the purchaser’s requirements and shall be stated
in metres. Tolerance on length shall be in accordance with ISO 1307.
5.3 Concentricity
When tested in accordance with 8.3, Method 2 of ISO 4671:2007, the variation from concentricity measured
between inside and outside diameters shall not exceed the following values:
Types A and C 1,5 mm
Type B 0,4 mm
6 Performance requirements of finished hose
6.1 Hydrostatic requirements
6.1.1 Deformation under maximum working pressure
The dimensional stability of the hose, when tested in accordance with ISO 1402, shall conform to the
requirements given in Table 4. The length of the test piece shall be 1 m.
For category I hoses, the initial test pressure shall be 0,07 MPa and the final test pressure shall be 1,5 MPa.
For category II hoses, the initial test pressure shall be 0,07 MPa and the final test pressure shall be 4,0 MPa.
–1
The twist shall be no greater than 30° m for types A and C. For type B, the twist may be greater than
–1
30° m but in this case it shall only be in a direction which closes the coupling and shall be stated in the test
report.
Table 4 — Change in length and external diameter
Tolerances for types A, B and C
%
Change in length
0 to +7,5
Change in external diameter 0 to +7,5
NOTE Hose with a lower maximum change in length may be agreed between the purchaser and manufacturer.
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ISO 4642-2:2009(E)
6.1.2 Deformation under proof pressure
A proof pressure hold test shall be carried out on three hose lengths each of 1 m in accordance with ISO 1402.
The proof pressure shall be as given in Table 2 and, on examination during the test, the test pieces shall not
show any evidence of leakage, cracking, abrupt distortion or other signs of failure.
6.1.3 Minimum burst pressure
A burst pressure test shall be carried out in accordance with ISO 1402 on the three test pieces used for the
deformation under proof pressure test, until the hose bursts.
None of the test pieces shall burst at a pressure less than that given in Table 2.
6.1.4 Kink pressure
When tested in accordance with Annex A, the test piece shall neither burst nor show any visible signs of
defect before or after pressurizing at 1,5 MPa for category I hoses and at 4,0 MPa for category II hoses.
6.2 Adhesion
When tested in accordance with ISO 8033, the adhesion between all components shall be not less than
1,5 kN/m for type A hoses, 1,0 kN/m for type B hoses and 2,0 kN/m for type C hoses. Dependent on the
construction of the hose, the test piece in all cases shall be decided by the test laboratory in accordance with
ISO 8033.
6.3 Accelerated ageing
When tested in accordance with Annex B, the three test pieces subjected to the burst pressure test shall
conform to the requirements of 6.1.3. The mean of the burst pressure test results shall not decrease by more
than 25 % from the initial mean burst value determined from the results obtained in 6.1.3.
The resultant adhesion of the fourth test piece shall be in accordance with the requirements of 6.2.
NOTE There is no limitation on the increase in the values of these properties.
6.4 Abrasion resistance
6.4.1 General
Abrasion tests are specific to different hose constructions and/or materials. Two procedures with different
values are therefore specified here to avoid unfair discrimination. In addition, it is important to note that the
requirements, revolutions as given in Table 5 and double strokes as given in Table 6, cannot be correlated.
6.4.2 Abrasion resistance of class 5 and class 6 hoses
When tested in accordance with Annex C and using the number of revolutions given in Table 5, at least four of
the five test pieces shall not burst on being subjected to the normal working pressure given in Table 2.
Table 5 — Abrasion resistance of uncovered hose (classes 5 and 6)
Inside diameter
Number of revolutions
mm
12, 19, 25 and 33 300
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ISO 4642-2:2009(E)
6.4.3 Abrasion resistance of classes 1, 2, 3 and 4 hoses
When tested in accordance with Annex D, the average number of double strokes completed before burst shall
be not less than that given in Table 6.
Table 6 — Abrasion resistance of covered hose (classes 1, 2, 3 and 4)
Inside diameter
Minimum number of double strokes before burst
mm
12, 19, 25 and 33 300

6.5 Low temperature flexibility
The test shall be carried out in accordance with Clause 4, Method B of ISO 4672:1997, using a mandrel of
outside diameter equal to 12 × the inside diameter of the hose. After bending the hose round the mandrel
through 180° for (10 ± 2) s at a temperature of (−20 ± 2) °C, or lower if requested, it shall not show any signs
of breaking or cracking and shall meet the proof pressure requirement given in Table 2.
6.6 Hot surface resistance
When tested in accordance with Annex E at a test temperature of (300 ± 10) °C for types A and B and of
(400 ± 10) °C for type C, in none of the four tests shall the test piece show signs of leakage within 60 s of the
application of the filament rod or on removal of this filament rod after the specified period.
6.7 Ozone resistance
After carrying out an ozone resistance test in accordance with 8.1, Method 1 of ISO 7326:2006 for all inside
diameter sizes and types, the hose lining and cover shall not show any signs of cracking. The lining shall be
examined by slitting the hose wall.
6.8 Bending and crush resistance
When tested in accordance with Annex F at a temperature of (23 ± 2) °C, the ratio T:D shall not exceed 1,20.
6.9 UV resistance (xenon arc lamp)
NOTE A test for resistance to UV and requirements based on ISO 11758 will be added at the first revision of this part
of ISO 4642, when more experience has been acquired.
6.10 Loss in mass on heating
When tested in accordance with 6.2, Method B of ISO 176:2005, the lining and cover materials shall not show
a loss in mass greater than 4 %.
6.11 Deformation under crushing (type C only)
When tested in accordance with Annex G, the test piece shall allow the free passage of a ball of the diameter
specified in Table 7.
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ISO 4642-2:2009(E)
Table 7 — Deformation under crushing
Crush dimension,
Inside diameter Minimum force Ball diameter
outside diameter
mm mm N mm
12 6 500 10
19 9,5 500 16
25 12,5 500 21
33 16 500 27

6.12 Hose assemblies
In some circumstances it is not the manufacturer who supplies the hose complete with couplings attached. In
this case, the purchaser should be aware that this is outside the scope of this part of ISO 4642 and should
ensure by other means that the security of the hose assembly has been tested.
Where the hose couplings are fitted by the hose manufacturer, the security of the hose assembly shall be
tested in accordance with Annex H, by the manufacturer, before delivery to the purchaser. There shall be no
sign of leakage or movement of the hose from the coupling.
NOTE The hose manufacturer should fit hose couplings that conform to any relevant national standards or legal
requirements of the country of use.
7 Frequency of testing
The minimum frequency of testing shall conform to the schedule given in Annex I.
Routine tests are hose tests carried out on every manufactured length of finished hose.
Production tests are those carried out per batch per the schedule in Annex J.
8 Type tests
Type testing is carried out in order to confirm that all the materials, construction and test requirements of this
part of ISO 4642 have been met by the method of manufacture and hose design.
Type testing shall be repeated at a minimum of every five years or whenever there is a change in the method
of manufacture of materials.
9 Test report
A test report shall be supplied if requested by the customer.
10 Recommendation for packaging and storage
Details of packaging and storage are given in ISO 8331.
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ISO 4642-2:2009(E)
11 Marking
Each length of hose shall be legibly and permanently marked with the following minimum information, at least
twice per length, at both ends, for type B hoses and along the whole length at minimum intervals of 2 m for
type A and type C hoses:
a) manufacturer's name or trademark;
b) number of this part of ISO 4642, i.e., ISO 4642-2;
c) hose category;
d) type, class;
e) inside diameter in millimetres;
f) maximum working pressure in MPa (bar);
g) quarter and year of manufacture;
h) test temperature if lower than −20 °C (see 6.5);
i) approval number and certifying body or its reference, where applicable.
EXAMPLE Man-ISO 4642-2-I-A-2-19- (15bar) - 2Q/2006
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ISO 4642-2:2009(E)
Annex A
(normative)

Kink pressure test
A.1 Principle
This tests the hose for leakage or damage in a kinked test piece held under pressure.
A.2 Test piece
The test piece shall be a hose assembly, 2,0 m in length.
A.3 Apparatus
A.3.1 Source of hydrostatic pressure, with water as the test medium, capable of maintaining a pressure
of 1,5 MPa for category I hose and of 4,0 MPa for category II hose.
A.4 Procedure
Connect the test piece to the pressure source and fill with water, expelling all air before securely clamping the
free end of the hose. Maintain a pressure of 0,07 MPa in the test piece while bending it through 180° at a point
approximately midway along its length. Tie the free end of the hose back on itself, as close as possible to the
secure end, so as to form a sharp kink, ensuring that the tie does not prevent subsequent expansion of the
diameter of the test piece.
Raise the pressure in the test piece to that given in 6.1.4 over a period of 60 s. Maintain the pressure for 1 min.
Examine the test piece for any sign of leakage or damage prior to releasing the pressure.
A.5 Test report
The test report shall include the following information:
a) a full description of the hose tested;
b) a reference to this part of ISO 4642, i.e., ISO 4642-2:2008;
c) any evidence of leakage or damage observed;
d) the date of the test.
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ISO 4642-2:2009(E)
Annex B
(normative)

Accelerated ageing test
B.1 Test pieces
Four test pieces taken from the hose, each of 1 m length, shall be tested.
NOTE It is preferred that the test pieces be taken from the hose adjacent to the original burst and adhesion test
pieces.
B.2 Procedure
Age the test pieces in air for 7 d at a temperature of (70 ± 1) °C in a temperature-controlled oven as specified
in ISO 188.
After ageing, subject three of the test pieces to the burst pressure test as given in 6.1.3.
Subject the remaining test piece to the adhesion test as given in 6.2.
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ISO 4642-2:2009(E)
Annex C
(normative)

Surface abrasion resistance test
C.1 Test pieces
Five test pieces of hose, each 0,35 m in length, shall be tested.
C.2 Apparatus
C.2.1 Test machine, for abrading the surface of a pressurized rotatable test piece with a laterally moveable
abrading strip which is continually renewed. See Figure C.1.
The driven rotating coupling is fixed in the axial direction whereas the other coupling can be moved axially in a
guide.
The abrasion arm is in the form of a rocker pivoted to swivel upwards, and the weight of the arm is such that a
force of 105 N acts on the test piece when it is set horizontally. This abrasion arm reciprocates along the hose
–1 –1
axis at a rate of between 18 mm s to 20 mm s over a distance of 80 mm, with the direction of travel being
changed automatically. The pause time at the reversal points shall not exceed 0,1 s in each case.
The abrasion arm carries the abrading strip which moves 4 mm along the hose length for each double stroke,
and the test piece is supported midway along its length by plain rollers.
C.2.2 Air pressure vessel, with a capacity of at least 2 l, fitted to the test machine to retain the pressure in
the event of loss of water.
C.2.3 Abrasive material, consisting of a roll of corundum twill emery cloth measuring 50 mm wide and
approximately 50 m long. The abrasive used for this abrasive material shall be synthetic 15, good quality
fused aluminium oxide (Al O ) with a minimum Al O content of 70 % by mass. It shall have a grain size of
2 3 2 3
1)
60P .
C.3 Procedure
Position the test piece in the machine and connect to the pressure source. Fill it with water at (20 ± 3) °C
expelling all air.
When a pressure of 0,5
...