ISO 8066-2:2001
(Main)Rubber and plastics hoses and hose assemblies for automotive air conditioning — Specification — Part 2: Refrigerant 134a
Rubber and plastics hoses and hose assemblies for automotive air conditioning — Specification — Part 2: Refrigerant 134a
This part of ISO 8066 specifies the requirements for rubber or thermoplastic hoses and hose assemblies used for circulating liquid and gaseous R134a (tetrafluoroethane) in the air-conditioning systems of automobiles. The hoses and hose assemblies are designed in such a way as to restrict losses of refrigerant and contamination of the system. The operational temperature range is _ 40 °C to +125 °C. Due to the critical relationship between the hose and coupling for this application, a requirement that the coupling to be used in service be used for testing is laid down.
Tuyaux et flexibles en caoutchouc et en plastique pour climatisation des automobiles — Spécifications — Partie 2: Réfrigérant 134a
General Information
Standards Content (Sample)
INTERNATIONAL ISO
STANDARD 8066-2
First edition
2001-09-01
Rubber and plastics hoses and hose
assemblies for automotive air
conditioning — Specification —
Part 2:
Refrigerant 134a
Tuyaux et flexibles en caoutchouc et en plastique pour climatisation des
automobiles — Spécifications —
Partie 2: Réfrigérant 134a
Reference number
ISO 8066-2:2001(E)
©
ISO 2001
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ISO 8066-2:2001(E)
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ii © ISO 2001 – All rights reserved
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ISO 8066-2:2001(E)
Contents Page
Foreword.iv
1 Scope .1
2 Normative references .1
3 Terms and definitions .2
4 Classification.2
5 Dimensions.3
6 Testing and performance requirements.4
7 Marking .8
Annex A (normative) Determination of refrigerant loss.9
Annex B (normative) Low-temperature test .12
Annex C (normative) Determination of amount of matter extracted from hoses by liquid R134a.13
Annex D (normative) Water ingression test .14
Annex E (normative) Coupling integrity (sealability) .18
Annex F (informative) ISO and SAE refrigerant hose information .20
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ISO 8066-2:2001(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 3.
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 part of ISO 8066 may be the subject of patent
rights. ISO shall not be held responsible for identifying any or all such patent rights.
International Standard ISO 8066-2 was prepared by Technical Committee ISO/TC 45, Rubber and rubber products,
Subcommittee SC 1, Hoses (rubber and plastics).
ISO 8066 consists of the following parts, under the general title Rubber and plastics hoses and hose assemblies for
automotive air conditioning — Specification:
— Part 1: Refrigerant 12
— Part 2: Refrigerant 134a
Annexes A, B, C, D and E form a normative part of this part of ISO 8066. Annex F is for information only.
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INTERNATIONAL STANDARD ISO 8066-2:2001(E)
Rubber and plastics hoses and hose assemblies for automotive air
conditioning — Specification —
Part 2:
Refrigerant 134a
WARNING — Persons using this part of ISO 8066 should be familiar with normal laboratory practice. This
part of ISO 8066 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 health and safety practices and to ensure compliance
with any national regulatory conditions.
1 Scope
This part of ISO 8066 specifies the requirements for rubber or thermoplastic hoses and hose assemblies used for
circulating liquid and gaseous R134a (tetrafluoroethane) in the air-conditioning systems of automobiles. The hoses
and hose assemblies are designed in such a way as to restrict losses of refrigerant and contamination of the
system. The operational temperature range is � 40 °Cto+125 °C.
Due to the critical relationship between the hose and coupling for this application, a requirement that the coupling
to be used in service be used for testing is laid down.
2 Normative references
The following normative documents contain provisions which, through reference in this text, constitute provisions of
this part of ISO 8066. For dated references, subsequent amendments to, or revisions of, any of these publications
do not apply. However, parties to agreements based on this part of ISO 8066 are encouraged to investigate the
possibility of applying the most recent editions of the normative documents indicated below. For undated
references, the latest edition of the normative document referred to applies. Members of ISO and IEC maintain
registers of currently valid International Standards.
ISO 471:1995, Rubber — Temperatures, humidities and times for conditioning and testing
ISO 1402:1994, Rubber and plastics hoses and hose assemblies — Hydrostatic testing
ISO 1817:1999, Rubber, vulcanized — Determination of the effect of liquids
ISO 3448:1992, Industrial liquid lubricants — ISO viscosity classification
ISO 4671:1999, Rubber and plastics hoses and hose assemblies — Methods of measurement of dimensions
ISO 6803:1994, Rubber or plastics hoses and hose assemblies — Hydraulic-pressure impulse test without flexing
ISO 7326:1991, Rubber and plastics hoses — Assessment of ozone resistance under static conditions
ISO 8330:2001, Rubber and plastics hoses and hose assemblies — Vocabulary
SAE J51:1998, Refrigerant 12 Automotive Air-Conditioning Hose
SAE J2064:1999, R134a Refrigerant Automotive Air-Conditioning Hose
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ISO 8066-2:2001(E)
3 Terms and definitions
For the purposes of this part of ISO 8066, the terms and definitions given in ISO 8330 apply.
4 Classification
4.1 Grades
4.1.1 Grades A1 and A2 — Rubber, textile-reinforced
Hoses having a seamless, rubber lining, a reinforcement consisting of textile yarn, cord or fabric bonded to the
lining and cover, and an outer cover of heat- and ozone-resistant rubber.
NOTE Commercial products normally offered for grade A1 hoses have a one-braid reinforcement of textile yarn and an
outside diameter smaller than that of grade A2 hoses. Grade A2 hoses are a two-braid hose. Hose fittings for grade A1 and A2
hoses are not normally interchangeable.
4.1.2 Grade B — Rubber, wire-reinforced
Hoses having a seamless, rubber lining, a reinforcement consisting of wire, and a cover consisting of a heat-
resistant textile yarn impregnated with a rubber cement.
4.1.3 Grade C — Thermoplastic-barrier, textile-reinforced, rubber-covered
Hoses having a lining comprising a thermoplastic barrier with a layer of rubber on each side, a reinforcement
consisting of textile yarns, and a cover of heat- and ozone-resistant rubber.
4.1.4 Grade D — Thermoplastic-veneer, textile-reinforced, rubber-covered
Hoses having a rubber lining with a thin thermoplastic veneer on the inside (fluid side), a reinforcement consisting
of textile yarn, cord or fabric bonded to the lining and cover, and a cover of heat- and ozone-resistant rubber.
4.1.5 Grade E — Thermoplastic, textile-reinforced, thermoplastic-covered
Hoses having a seamless thermoplastic inner lining, a reinforcement consisting of textile yarn, cord or fabric
bonded to the lining and cover, and a cover of heat- and ozone-resistant thermoplastic.
4.2 Groups
4.2.1 Group 1 — Discharge/liquid, moisture-resistant
Hoses for use in discharge/liquid applications that have moisture resistance as defined in 6.15.
4.2.2 Group 2 — Discharge/liquid, medium moisture-resistant
Hoses for use in discharge/liquid applications that have medium moisture resistance as defined in 6.15.
4.2.3 Group 3 — Suction, moisture-resistant
Hoses for use in suction applications that have moisture resistance as defined in 6.15.
4.2.4 Group 4 — Suction, medium moisture-resistant
Hoses for use in suction applications that have medium moisture resistance as defined in 6.15.
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ISO 8066-2:2001(E)
5 Dimensions
5.1 Hose inside and outside diameters
When measured in accordance with method 2 of ISO 4671:1999, the hose inside diameter shall conform to the
requirements given in Table 1. When measured in accordance with method 1 of ISO 4671:1999, the hose outside
diameter shall conform to the requirements given in Table 2.
Table 1 — Inside diameter
Dimensions in millimetres
Inside diameter
Nominal
Grade A1 Grade A2 Grade B Grade C Grade D Grade E
bore
min. max. min. max. min. max. min. max. min. max. min. max.
4,8 4,8 5,4 4,6 5,1
6,4 6,2 7,0 6,1 6,7
8 7,8 8,6 7,8 8,6 8,0 8,7 7,8 8,6 8,0 8,7 7,6 8,3
9,5 9,1 9,9
10 10,2 11,1 10,2 11,1 10,3 11,1 10,2 11,1 10,3 11,1 9,9 10,7
13 12,4 13,6 12,4 13,6 12,7 13,7 12,4 13,6 12,7 13,7 12,2 13,2
16 15,6 16,8 15,6 16,8 15,9 16,9 15,6 16,8 15,9 16,9 15,2 16,5
22 22,2 23,3 22,2 23,3
29 28,6 29,8 28,6 29,8
Table 2 — Outside diameter
Dimensions in millimetres
Outside diameter
Nominal
Grade A1 Grade A2 Grade B Grade C Grade D Grade E
bore
min. max. min. max. min. max. min. max. min. max. min. max.
4,8 12,7 13,7 8,3
6,4 13,5 15,1 11,4
8 17,5 19,1 18,3 19,8 16,7 17,6 18,3 19,8 16,7 17,6 13,5
9,5 15,2
10 21,4 23,0 22,2 23,8 18,9 20,0 22,2 23,8 18,9 20,0 16,1
13 23,8 25,4 24,6 26,2 22,8 24,0 24,6 26,2 22,8 24,0 18,8
16 27,8 28,5 27,8 29,4 26,8 28,0 27,8 29,4 26,8 28,0 23,4
22 30,6 32,2 30,6 32,2
29 37,3 38,9 37,3 38,9
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ISO 8066-2:2001(E)
5.2 Hose wall thickness variation
When the wall thickness is measured in accordance with method 2 of ISO 4671:1999, the variation in the wall
thickness shall not exceed the values given in Table 3.
Table 3 — Wall thickness variation
Grades A, B, C and D Grade E
Nominal bore Maximum departure from Nominal bore Maximum departure from
concentricity concentricity
mm mm
4,8 and 6,4 0,8 4,8 and 6,4 0,5
8to22 1,0 8to13 0,6
29 1,3 16 0,8
6 Testing and performance requirements
6.1 Test conditions and test fluid
The testing room shall be kept at standard temperature in accordance with ISO 471. The temperature of the hoses
or hose assemblies shall be stabilized for 24 h before testing.
Except for the extraction test in 6.10 which uses refrigerant R134a only, the refrigerant used shall be R134a
containing (10� 1) % of poly(alkylene glycol) (PAG) lubricating oil when required. The hose shall be tested with the
same couplings as those intended for end use. The end termination of the coupling may be of a convenient type for
testing.
6.2 Leakage
6.2.1 Requirement
When determined in accordance with the procedure given in 6.2.2, the loss in mass of refrigerant shall be no
greater than 10 % of the initial mass of the refrigerant and there shall be no visible deterioration in the hoses or
hose assemblies.
6.2.2 Procedure
Test three test pieces. Fill each test piece with R134a containing (10� 1) % PAG oil. Maintain each test piece for
24 h at a temperature of 90 °C� 2 °C.
NOTE This test may be carried out separately or during the 24 h pre-conditioning period for the refrigerant loss test (see
6.3) at 90 °C � 2 °C.
In the event that the test is carried out separately from 6.3, use the procedure described in annex A.
6.3 Refrigerant loss
6.3.1 Requirement
When determined in accordance with the procedure described in 6.3.2, the loss of refrigerant from the hoses or
hose assemblies shall be no greater than the values given in Table 4.
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ISO 8066-2:2001(E)
6.3.2 Procedure
Test the hoses or hose assemblies in accordance with the procedure described in annex A at the temperature
specified in Table 4. Test hoses or hose assemblies used in the part of the system operating at high pressure at
90 °C� 2 °C. Test hoses or hose assemblies used in the part of the system operating at low pressure (suction line
applications) at 80 °C� 2 °C.
Table 4 — Refrigerant loss
a
Maximum allowable loss of refrigerant
Test temperature
2
kg/m /year
°C
Grades A and B Grades C, D and E
80 29,0 9,7
90 40,0 30,0
a
Based on the internal surface area of the hose.
6.4 Ageing
6.4.1 Requirement
When tested in accordance with 6.4.2, there shall be no leak or loss during the test from cracks in a test hose or
hose assembly.
6.4.2 Procedure
Wind a hose or hose assembly, of length between 300 mm and 1 000 mm, on to a mandrel having a diameter eight
times the outside diameter of the hose. Place the mandrel and hose or hose assembly in a circulating-air oven for
168 h at 125 °C� 2 °C.
Take the mandrel and hose or hose assembly out of the oven, allow to cool to ambient temperature, unwind the
hose or hose assembly and examine it externally for any cracks, disintegration or other defects. Subject the hose or
hose assembly to an internal hydrostatic pressure of 2,4 MPa (24 bar) for 5 min to show any leak or loss of liquid.
6.5 Low-temperature test
When tested in accordance with the method described in annex B, there shall be no leak or loss due to cracks or
splits.
6.6 Reduced pressure
6.6.1 General
A hose or hose assembly shall be subjected, consecutively, to the reduced-pressure test, then the length variation
test (6.7), then the burst test (6.8).
6.6.2 Requirement
The decrease in the outside diameter of the hose shall not exceed 20 % of the initial outside diameter when the
hose or hose assembly is subjected to a reduced internal pressure (vacuum) of 13,3 kPa� 6 kPa (absolute) for
2 min in accordance with 6.6.3.
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ISO 8066-2:2001(E)
6.6.3 Procedure
The test hose or hose assembly shall have a free length of from 610 mm to 1 000 mm. Bend the hose into a
U-shape, whereby the internal radius of the base of the U shall be five times the mean outside diameter of the
hose. Apply a vacuum of 13,3 kPa� kPa (absolute) to the bent hose for 2 min. At the end of this period and while
the vacuum is still being applied, measure the outside diameter of the hose at the base of the U, in order to
determine the minimum outside diameter at that point.
6.7 Length change under pressure (see 6.6)
6.7.1 Requirement
When subjected to a pressure of 2,4 MPa (24 bar), a hose or hose assembly shall not contract by more than 4 % or
extend by more than 2 %.
6.7.2 Procedure
Subject the hose or hose assembly, in a horizontal position, to an internal hydrostatic pressure of 7 kPa (0,07 bar)
and measure the length. Increase the pressure to the prescribed value and measure the length once again within
the following minute. Express the length as a percentage of the length at 7 kPa (0,07 bar).
Refer to ISO 1402 for additional information.
6.8 Minimum bursting pressure (see 6.6)
When determined in accordance with the method described in ISO 1402, using test pieces that have been
subjected to the test for refrigerant loss described in 6.3, the minimum bursting pressure shall be 12 MPa (120 bar)
for all grades and sizes of hose and hose assembly.
6.9 Proof pressure
6.9.1 Requirement
When tested in accordance with the procedure described in 6.9.2, a hose or hose assembly shall exhibit no
leakage, cracking, abrupt distortion (indicating irregularity in materials or manufacture) or other signs of failure.
6.9.2 Procedure
Hydrostatically pressurize a hose or hose assembly to 50 % of the minimum burst pressure and hold the pressure
for 2 min� 30 s. During and after the proof pressure hold period, examine the hose.
6.10 Extraction by R134a
When determined in accordance with annex C, the quantity of matter extracted from the lining of the hose by the
2
R134a shall not exceed 118 g/m .
NOTE The substances extracted will be of an oily or greasy nature.
6.11 Volume change in R134a
6.11.1 General
This requirement applies only to the lining of the hose and is carried out by the method described in ISO 1817.
Place a test portion of the lining in a pressure vessel, cooled to below � 30 °C and totally immersed in R134a
containing (10� 1) % PAG oil. Seal the vessel and place it in a circulating-air oven at 90 °C� 2 °C.
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ISO 8066-2:2001(E)
6.11.2 Rubber materials
When the test is carried out in accordance with ISO 1817 for 70 h at 90 °C� 2 °C in R134a containing (10� 1) %
PAG oil, the volume change measured during the 5 min after taking the test portion out of the refrigerant shall be
between�5% and+35%.
6.11.3 Thermoplastic materials
When the test is carried out in accordance with ISO 1817 for 70 h at 90 °C� 2 °C in R134a containing (10� 1) %
PAG oil, the volume change measured during the 5 min after taking the test portion out of the refrigerant shall be
within�5%.
6.12 Ozone resistance
This requirement applies only to grade A, C, D and E hoses.
Bend the hose around a mandrel with a diameter equal to eight times the mean outside diameter of the hose, and
carry out the test in accordance with method 1 of ISO 7326:1991 using an ozone concentration of 50 mPa�5mPa.
The hose cover shall exhibit no visible cracks when viewed under � 2 magnification.
6.13 Hose cleanliness
6.13.1 Requirement
The tube of the hose shall be dry and clean. When determined in accordance with 6.13.2, the mass of insoluble
2
matter shall be a maximum of 270 mg/m based on the internal surface area of the hose.
6.13.2 Procedure
Take a hose test piece having a minimum length of 300 mm. Bend the hose into a U-shape, with the legs of the U
of equal length. Place the hose in a vertical position and fill the hose with a solvent suitable as a substitute for
trichlorotrifluorethane (CFC113).
The following solvents can be used as substitutes for trichlorotrifluorethane (this is only a partial list of acceptable
substitutes, and other materials may be more readily available):
� N-propyl bromide, which is manufactured by Amity under the trade name Leksol;
� hydrofluoroether, which is manufactured by 3M under the trade name HFE 7100;
� decafluoropentane/dichloroethylene blend, which is manufactured by DuPont under the trade name Vertrel
MCA.
NOTE Trichlorotrifluorethane used to be the recommended solvent for this test, but it is not available for most applications
and in many locations since it has been identified as an ozone-depleting chemical.
Immediately empty the hose, filtering the solvent through a prepared Gooch crucible, a sintered-glass crucible or a
0,4�m filter of known mass.
After drying the filter and residue at approximately 70 °C for 20 min, determine the mass of insoluble matter by
difference.
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ISO 8066-2:2001(E)
6.14 Impulse test
6.14.1 Requirement
When tested in accordance with 6.14.2, hoses or hose assemblies shall not leak or fail after 150 000 cycles.
6.14.2 Procedure
Carry out the test in accordance with ISO 6803.
Install a minimum of two hoses or hose assemblies on the test apparatus and subject them to a pulsating pressure
of 500 kPa� 500 kPa (5 bar� 5 bar) to 2,6 MPa� 130 kPa (26 bar� 1,3 bar) at 30 cycles to 40 cycles per min.
Use oil conforming to ISO VG 46 at 40 °C in accordance with ISO 3448. Perform the test at 125 °C� 2 °C.
Use a minimum bend radius of five times the outside diameter of the hose.
6.15 Water ingress test
When determined in accordance with annex D, the rate of ingress of moisture shall not exceed the values listed in
Table 5.
Table 5 — Rate of ingress of moisture
Maximum rate of ingress of moisture
Hose
2
g/mm /year
�4
Moisture-resistant hose 3,90 � 10
�3
Medium moisture-resistant hose 1,11 � 10
6.16 Coupling integrity (sealability)
The couplings used shall be the same as those intended for use in service.
Carry out the test in accordance with annex E.
The maximum mass loss per canister (two couplings) per 12-day test shall not exceed 10 g.
None of the four post-exposure flexing evaluations shall produce hissing or visible oil loss at any location in the
coupled assembly.
7 Marking
Except where it is too small to label, the hose or hose assembly shall be marked with the following minimum
information:
a) the manufacturer's name and trademark;
b) the number of this part of ISO 8066, i.e. ISO 8066-2:2001;
c) the grade of hose;
d) the group of hose;
e) the nominal bore of the hose;
f) the name of the refrigerant, i.e. "R134a";
g) the month and year of manufacture.
EXAMPLE MAN/ISO 8066-2/A2/1/16/R134a/09/01
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ISO 8066-2:2001(E)
Annex A
(normative)
Determination of refrigerant loss
A.1 Principle
The rate of effusion of refrigerant through the walls of the hose is determined by measuring the change in mass of
refrigerant-filled test pieces over a given period of time.
A.2 Apparatus
3 3
A.2.1 Canister, having an internal volume between 475 cm and 525 cm , a minimum bursting pressure of
21 MPa (210 bar) and appropriate fittings to enable a hose test assembly to be connected up to it.
A.2.2 Hose fittings, enabling the refrigerant to be held under pressure in the hose without any loss between the
hose and the fittings, and being the same as the fittings intended for use in service.
A.2.3 Circulating-air oven, capable of maintaining uniform test temperatures for the duration of the test.
A.2.4 Scales, weighing to� 0,1 g.
A.3 Test assemblies
Take four assemblies, each with a free length of 1 m. Three of these assemblies shall be used for determining the
refrigerant loss; the fourth shall serve as a reference for the determination of the change in mass of the body of the
hose alone.
A.4 Procedure
A.4.1 Preliminary operations
Measure the free length of each hose at atmospheric pressure to the nearest 1 mm. Connect each of the four
hoses to a canister and determine the mass of each hose/canister assembly, including the end-plug which will be
used to plug the free end of the hose, to within � 0,1 g. Introduce into three of the hose/canister assemblies 0,6 mg
3
of refrigerant R134a containing (10� 1) % PAG oil per mm volume of the assembly with a tolerance of � 5g.
NOTE Method 1 (see A.4.2) and method 2 (see A.4.3) are recommended for introducing the refrigerant into the
assemblies.
A.4.2 Method 1
The hose/canister assemblies may be filled satisfactorily by cooling them in a refrigerator for a minimum of 4 h at a
temperature of � 30 °Corlower.
From the density of refrigerant R134a and (10� 1) % PAG oil at the conditioning temperature, it is possible to
calculate the volume of refrigerant/PAG mixture required at this temperature. Keeping the refrigerant/PAG mixture
and hose at the conditioning temperature, the hose may then be filled, measuring the volume of refrigerant/PAG
mixture using a graduated flask.
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ISO 8066-2:2001(E)
The filled assemblies are then plugged while still at the conditioning temperature, but may be taken out of the
refrigerator to tighten the connections.
A.4.3 Method 2
The hose/canister assemblies may be filled at ambient temperature by transferring the refrigerant/PAG mixture
under pressure. A suitable apparatus for this purpose is a cylinder of refrigerant, a receiver-type compressed-air
system, a piston pump and a meter for measuring the quantity of liquid transferred.
A.4.4 Determination
A.4.4.1 Condition the three filled assemblies and the reference assembly by placing them together in the oven
at the test temperature specified for 30 min� 5 min to eliminate surface moisture. When in the oven, the
assemblies shall not be bent to such an extent that the radius of curvature is less than 20 times the outside
diameter of the hose.
A.4.4.2 Take the assemblies out of the oven and ensure that the filled assemblies are not leaking. Weigh them
a minimum of 15 min and a maximum of 30 min after taking them out of the oven. Record the initial mass of each
filled assembly (m ) and the initial mass of the reference assembly (m ).
1 3
A.4.4.3 Expose the four assemblies to a 24 h period in the oven at the test temperature specified. Weigh the
assemblies at the end of this first 24 h period as specified in A.4.4.2 and record the mass of each filled assembly
(m ) and the mass of the reference assembly (m ) for that cycle.
2 4
A.4.4.4 Repeat the 24 h exposure/weighing cycle until a steady state is reached, i.e.
a) until the values of the net loss of refrigerant [(m � m ) � (m � m )] for the last four exposure cycles are within
1 2 3 4
10 % of the lowest value
or
b) for 25 days,
whichever occurs first.
A.5 Calculation
Calculate the rate of loss of refrigerant R, in kilograms per square metre per year, for each of the filled assemblies
using equation (1):
��
mm� �mm�
� � � ��k
12 34
R����� (1)
��
ll ��d �t
��12
��
where
m is the initial mass of the filled assembly after the conditioning period, in grams;
1
m is the final mass of the filled assembly at the steady state, in grams;
2
m is the initial mass of the reference assembly after the conditioning period, in grams;
3
m is the final mass of the reference assembly at the steady state, in grams;
4
l is the length of the filled assembly, in metres;
1
l is the length of the reference assembly, in metres;
2
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ISO 8066-2:2001(E)
d is the inside diameter of the hose, in millimetres;
k is a constant (116,2) to convert R-values to kilograms per square metre per year;
t is the time taken to reach the steady state, in days.
A.6 Test report
The test report shall include the following information:
a) a reference to this part of ISO 8066, i.e. ISO 8066-2:2001;
b) all details necessary for complete identification of the hose tested;
c) all details necessary for complete identification of the coupling used;
d) the results obtained;
e) any incident which is likely to have affected the results.
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ISO 8066-2:2001(E)
Annex B
(normative)
Low-temperature test
B.1 Principle
The test verifies that a hose filled with refrigerant R134a containing (10� 1) % PAG oil, aged beforehand for 48 h at
70 °C, kept at� 40 °C for 24 h, then bent to 180° on a mandrel, withstands a pressure of 2,4 MPa (24 bar) for 5 min
without leaking.
B.2 Test assembly
The length of the test assembly shall be between 450 mm and 1 000 mm.
B.3 Procedure
Fill the test assembly with a quantity of liquid R134a containing (10� 1) % PAG oil corresponding to 70 % of the
capacity of the hose at ambient temperature. The hose assembly and the liquid may be cooled below � 30 °Cso
that the refrigerant is in the liquid state, thus facilitating handling.
Place the assembly in a circulating-air oven at 70 °C for 48 h. Take the assembly out and allow it to cool to ambient
temperature.
Keeping the hose straight, place the assembly in a test c
...
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