ISO 8066-3:2020

Overview

ISO 8066-3:2020 specifies requirements for rubber and thermoplastic hoses and hose assemblies used to circulate liquid and gaseous R1234yf (tetrafluoropropene) in automotive air‑conditioning systems. The standard focuses on minimizing refrigerant loss and system contamination, and defines an operational temperature range of −40 °C to +125 °C. Because hose performance depends critically on the mating coupling, ISO 8066-3 requires that the coupling intended for service be used during testing.

Key topics and technical requirements

ISO 8066-3 covers classification, dimensions, testing and performance criteria for hoses and assemblies for R1234yf:

• Classification by construction type (examples in the standard: Type A–F: rubber textile‑reinforced, wire‑reinforced, barrier, thermoplastic, veneer types).
• Pressure classes, moisture‑ingression grades, and refrigerant‑permeation grades.
• Dimensional controls (inside diameters, wall thickness variation).
• Extensive testing and performance requirements, including:
  • Leakage tests (Method A for type/production, Method B for routine)
  • Refrigerant permeation and related test procedures
  • Ageing, low‑temperature, vacuum resistance
  • Bursting pressure, proof pressure, and length change under pressure
  • Extraction by R1234yf, ozone resistance, hose cleanliness
  • Impulse test, moisture ingression, and coupling integrity (sealability)
• Marking, test report content, and recommendations for packaging and storage.
• Normative annexes detail methods for permeation, low‑temperature testing, extraction, impulse testing, moisture ingression, coupling sealability, and test frequency.

Practical applications and users

ISO 8066-3 is essential for stakeholders involved with automotive A/C refrigerant systems using R1234yf:

• Hose and hose‑assembly manufacturers - design, material selection, production testing and quality control.
• Automotive OEMs and suppliers - specifying compliant hoses for vehicle HVAC systems and validating supplier claims.
• Testing laboratories and certification bodies - performing leakage, permeation, impulse and durability tests per the standard.
• Quality and compliance managers - ensuring supplier contracts, incoming inspection, and regulatory traceability.
• Design engineers - selecting hose types (rubber vs thermoplastic, barrier layers) according to performance classes.

Related standards

ISO 8066-3 references and complements other standards used in testing and specification, including:

• ISO 8066 series (other parts)
• ISO 8330 (vocabulary)
• ISO 1402 (hydrostatic testing)
• ISO 4671 (dimension measurement)
• ISO 7326 (ozone resistance)
• ISO 23529 and ISO/TR 11340 (conditioning and leakage classification)

Keywords: ISO 8066-3, R1234yf hoses, automotive air conditioning hoses, refrigerant permeation, hose assemblies, coupling integrity, thermoplastic hoses, rubber hoses.