ISO 18752:2025

Overview

ISO 18752:2025 - Rubber hoses and hose assemblies (wire‑ or textile‑reinforced single‑pressure types for hydraulic applications) specifies performance, construction and testing requirements for single‑pressure rubber hydraulic hoses and hose assemblies. The standard covers ten classes, four grades and seven types of wire‑ or textile‑reinforced hoses in nominal sizes from 5 to 102. Each class has a single maximum working pressure (MWP) for all sizes. ISO 18752:2025 focuses on hose performance - it does not specify connection ends.

Key Topics and Requirements

• Classification: Ten pressure classes (e.g., 35 to 560 bar equivalents), four grades (A–D) based on impulse resistance, and standard vs. compact types (AS/AC, BS/BC, CS/CC, DC).
• Materials & construction: Rubber lining compatible with hydraulic fluids, one or more layers of steel wire or textile reinforcement, and oil/abrasion/weather‑resistant rubber cover.
• Fluid compatibility & temperatures:
  • Oil‑based fluids (HH, HL, HM, HR, HV per ISO 6743‑4): −40 °C to +100 °C (AS/AC/BS/BC) or −40 °C to +120 °C (CS/CC/DC).
  • Water‑based fluids (HFC, HFAE, HFAS, HFB): −40 °C to +70 °C.
  • Water: 0 °C to +70 °C.
  • Note: final compatibility must be established by the user with the manufacturer.
• Performance testing: Hydrostatic tests, impulse resistance, minimum bend radius, cold flexibility, vacuum and ozone resistance, adhesion between components, abrasion and leakage testing. The standard defines test procedures, frequencies and acceptance criteria.
• Dimensions & tolerances: Inside/outside diameters, cover thickness, concentricity and length requirements measured per ISO methods.
• Hose assemblies: Assemblies must use fittings and fabrication methods that meet the standard’s performance tests; MWP of an assembly is limited by the lowest‑rated component.
• Marking, packaging, storage and documentation: Requirements for traceability, manufacturer information and test reporting.

Applications and Users

ISO 18752:2025 is intended for:

• Designers and OEMs specifying hydraulic hoses for mobile equipment, industrial machinery, construction and agricultural systems.
• Hose and fitting manufacturers, hose assemblers and test laboratories ensuring compliance with hydraulic hose performance requirements.
• Procurement, quality and maintenance teams requiring documented pressure, temperature and fluid compatibility data.

Keywords: ISO 18752:2025, hydraulic hoses, rubber hoses, hose assemblies, wire‑reinforced, textile‑reinforced, working pressure, fluid compatibility, impulse test, hydrostatic test.

Related Standards

Normative references include:

• ISO 1402 (hydrostatic testing)
• ISO 1817 (rubber - effect of liquids)
• ISO 4671 (dimensional measurement)
• ISO 6803 (impulse test without flexing)
• ISO 7233 (vacuum resistance)
• ISO 7326 (ozone resistance)
• ISO 8033 (adhesion)
• ISO 8330 (vocabulary)
• ISO 10619‑1/2 (flexibility and stiffness)

For specification, selection or compliance checks, consult the full ISO 18752:2025 text and coordinate fluid compatibility with the hose manufacturer.