ISO 8066-2:2001

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 2001
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ii © ISO 2001 – All rights reserved

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
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.
iv © ISO 2001 – All rights reserved

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
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.
2 © ISO 2001 – All rights reserved

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
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.
4 © ISO 2001 – All rights reserved

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 — Refriger
...