ISO 18752:2022

Overview - ISO 18752:2022 (rubber hoses and hose assemblies)

ISO 18752:2022 specifies requirements for wire- or textile-reinforced single‑pressure rubber hoses and hose assemblies for hydraulic applications. The standard covers ten classes, four grades and seven types of hoses in nominal sizes from 5 to 102. It defines construction, dimensions, performance and test requirements for hoses designed to work with oil‑based and water‑based hydraulic fluids and water over defined temperature ranges. Note: the standard addresses hose and hose‑assembly performance only - connection ends are excluded.

Key topics and technical requirements

• Classification
  • Ten pressure classes (single maximum working pressure per class).
  • Four impulse‑resistance grades: A, B, C and D.
  • Seven types by outside diameter and compactness: AS, AC, BS, BC, CS, CC, DC.
• Media and temperature ranges
  • Oil‑based fluids (ISO 6743‑4: HH, HL, HM, HR, HV): −40 °C to +100 °C for AS/AC/BS/BC; −40 °C to +120 °C for CS/CC/DC.
  • Water‑based fluids (HFC, HFAE, HFAS, HFB): −40 °C to +70 °C.
  • Water: 0 °C to +70 °C.
• Materials and construction
  • Inner rubber lining resistant to hydraulic fluid, one or more layers of steel wire or textile reinforcement, and oil/abrasion/weather‑resistant rubber cover; optional protective layers allowed.
• Performance and testing (selected)
  • Hydrostatic testing, impulse (dynamic) testing, resistance to cold flexibility, vacuum resistance, ozone resistance, abrasion, adhesion between components and leakage checks.
  • Requirements for minimum bend radius, change in length, and frequency of type/routine/production tests.
• Safety note
  • Hose assembly maximum working pressure is the lowest MWP among components; users must confirm fluid compatibility with the manufacturer.

Applications and who uses this standard

• Intended for manufacturers, designers, specifiers and procurement teams of hydraulic systems in mobile equipment, industrial machinery and fluid‑power installations.
• Useful for quality managers and test laboratories to ensure compliance with internationally accepted performance and testing methods.
• Helps OEMs and maintenance teams choose appropriate wire‑reinforced or textile‑reinforced hoses for specific pressure classes, media and temperature conditions.

Related standards (normative references)

• ISO 6743‑4 (hydraulic fluid classification)
• ISO 1402, ISO 6605, ISO 6803 (hydrostatic/impulse testing)
• ISO 4671 (dimensional measurement)
• ISO 8033 (adhesion), ISO 7233 (vacuum), ISO 10619‑1/2 (flexibility)
• ISO 17165‑1 (hose assembly dimensions/requirements)

Keywords: ISO 18752:2022, rubber hoses, hose assemblies, hydraulic applications, wire‑reinforced, textile‑reinforced, working pressure, impulse resistance, fluid compatibility, hydrostatic testing.