Overview
ISO 8066-4:2023 specifies requirements for rubber and plastics hoses and hose assemblies used in automotive air-conditioning systems carrying gaseous Refrigerant R1234yf (tetrafluoropropene). This part targets low vibration transmission hose assemblies (suction/low-pressure applications) designed to reduce vibration transfer from the engine bay to the cabin. Operational temperature range is −40 °C to +80 °C. Because hose performance is tightly linked to the coupling, the standard requires that the coupling intended for service be used during testing.
Key topics and technical requirements
- Construction and materials
- Seamless synthetic rubber inner tube, textile reinforcement (yarn/cord/fabric) and heat- & ozone-resistant synthetic rubber outer cover.
- Pressure class
- Specified as low-pressure suction application; working pressure: 1.06 MPa (10.6 bar).
- Dimensions
- Typical mean inside diameters include 14, 15, 15.9 (5/8), 19 (3/4) and 25.4 mm (1); other sizes permitted as needed.
- Testing and performance
- Gas leakage (Method A for type/production and Method B for routine tests)
- Refrigerant permeation (R1234yf permeation limits and determination)
- Ageing, low-temperature performance, vacuum resistance
- Length change under pressure, minimum bursting pressure and proof pressure
- Extraction by liquid R1234yf; ozone resistance; hose cleanliness
- Impulse (pressure fatigue) testing; moisture ingression grades (ML, Mm)
- Coupling integrity (sealability) - coupling used in service must be tested
- Vibration transmissibility - quantifies low-vibration performance
- Test frequency, marking, test reports, packaging and storage recommendations
- Normative annexes
- Detailed test procedures (permeation, low-temperature, impulse, moisture ingression, coupling sealability, vibration transmissibility, etc.)
Applications and users
ISO 8066-4:2023 is intended for:
- Automotive OEMs and HVAC system designers specifying R1234yf suction hoses
- Hose and hose-assembly manufacturers and suppliers ensuring compliance
- Quality and test laboratories performing type, production and routine tests
- Aftermarket and service providers replacing or certifying A/C hoses
- Regulatory bodies and procurement teams referencing safety, durability and refrigerant compatibility
Practical use: specifying and verifying hoses that minimize cabin vibration while ensuring compatibility, leak-tightness and durability with R1234yf refrigerant in passenger vehicles.
Related standards
Keywords: ISO 8066-4:2023, R1234yf hoses, automotive air conditioning hoses, low vibration transmission, hose assemblies, refrigerant permeation, coupling integrity, hose testing standards.