ISO 8066-4:2023

INTERNATIONAL ISO
STANDARD 8066-4
First edition
2023-07
Rubber and plastics hoses and
hose assemblies for automotive air
conditioning — Specification —
Part 4:
Low vibration transmission type for
Refrigerant 1234yf
Tuyaux et flexibles en caoutchouc et en plastique pour climatisation
des automobiles — Spécifications —
Partie 4: Type de transmission à faible vibration pour le réfrigérant
1234yf
Reference number
© ISO 2023
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Published in Switzerland
ii
Contents Page
Foreword .v
1 Scope . 1
2 Normative references . 1
3  Terms and definitions . 1
4  Classification . 2
4.1 Construction and material . 2
4.2 Pressure class . 2
4.3 Moisture-ingression grades . 2
5 Dimensions .2
5.1 Hose inside diameters . 2
5.2 Hose wall thickness variation . 3
6 Testing and performance requirements . 3
6.1 Test conditions . 3
6.2 Gas leakage . 3
6.2.1 Method A for type test and production test . 3
6.2.2 Procedure for method A . 3
6.2.3 Method B for routine test . 3
6.2.4 Procedure for method B. 4
6.3 Refrigerant permeation . 4
6.3.1 Requirement . 4
6.3.2 Procedure . 4
6.4 Ageing . 4
6.4.1 Requirement . 4
6.4.2 Procedure . 4
6.5 Low-temperature test . 4
6.6 Vacuum resistance . 4
6.6.1 General . 4
6.6.2 Requirement . 4
6.6.3 Procedure . 5
6.7 Length change under pressure . 5
6.7.1 Requirement . 5
6.7.2 Procedure . 5
6.8 Minimum bursting pressure . 5
6.9 Proof pressure . 5
6.10 Extraction by R1234yf . 6
6.11 Ozone resistance . 6
6.12 Hose cleanliness . 6
6.12.1 Requirement . 6
6.12.2 Procedure . 6
6.13 Impulse test . 6
6.13.1 Requirement . 6
6.13.2 Procedure . 6
6.14 Moisture ingression . 7
6.15 Coupling integrity (sealability) . 7
6.16 Vibration transmissibility . 7
7 Frequency of testing . .7
8 Marking . . 8
9 Test report . 8
10 Recommendations for packaging and storage . 8
Annex A (normative) Determination of refrigerant permeation . 9
iii
Annex B (normative) Low-temperature test .12
Annex C (normative) Determination of amount of matter extracted from hoses by liquid
R1234yf .13
Annex D (normative) Impulse test .14
Annex E (normative) Moisture ingression test .18
Annex F (normative) Coupling integrity (sealability) .22
Annex G (normative) Vibration transmissibility .24
Annex H (normative) Test frequency .27
Annex I (informative) Production tests .28
Bibliography .29
iv
Foreword
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