ISO 22749-1:2021

Overview

ISO 22749-1:2021 specifies characteristics and test methods for elastomer-mechanical parts used on railway vehicles and similar guided-track vehicles. The standard covers rubber and rubber-to-metal components intended for suspension systems, equipment mounting, joints (e.g., damper end-mountings, rubber bearings), and limit stops. It defines required physical, geometrical and functional characteristics and the inspection and test methods to verify them. Excluded items include pneumatic diaphragms, buffing/drawgear springs, hoses, seals and transmission belts.

Keywords: ISO 22749-1:2021, railway suspension components, elastomer-mechanical parts, rubber-to-metal parts, test methods.

Key topics and technical requirements

• Characteristics definition: physical (materials, mass), geometrical (space envelope, dimensions) and functional (force–displacement, stiffness, damping, dimensions under load).
• Environmental resistance: procedures and criteria for low/high temperature, ozone, oils/petroleum, chemicals, abrasion, fire behaviour and corrosion.
• Operating resistance: fatigue, static and dynamic creep, static and dynamic relaxation, and electrical resistance.
• Functional testing: measurement of force under deformation, force vs displacement at constant velocity, sinusoidal stiffness, damping and bonding tests for rubber-to-metal adhesion.
• Inspection and test methods: general test conditions, instrumentation, test-piece preparation and detailed test procedures for each characteristic. Annexes provide guidance on test device design, sample fatigue programmes, recommended tolerances and measurement velocities.
• Marking and documentation: requirements for identification and traceability of tested components.

Keywords: stiffness measurement, damping testing, fatigue resistance, bonding test, rubber testing, railway components testing.

Applications and who uses this standard

ISO 22749-1 is practical for:

• Design engineers and OEMs developing suspension and mounting components for trains and guided vehicles.
• Component manufacturers producing elastomeric elements or rubber-to-metal bonded parts.
• Test laboratories and QA/inspection teams validating product performance and conformity.
• Procurement and maintenance organizations specifying acceptance criteria for replacement parts.
• Certification bodies assessing compliance with railway material and safety requirements.

Typical applications include vehicle suspension elements, rubber bearings, damper end-mounts, mechanical coupling elastomers and limit stops used on rail vehicles.

Keywords: railway OEMs, test laboratories, component manufacturers, suspension design.

Related standards

• Other ISO railway standards and material testing standards should be consulted for system-level requirements and complementary test methods (e.g., general railway rolling stock standards, material-specific ISO tests). Users should reference the normative references listed in ISO 22749-1 for complete conformity and traceability.

Keywords: railway standards, ISO testing norms, material compatibility.