ISO 10619-2:2021

Overview

ISO 10619-2:2021 specifies laboratory bending tests to measure the flexibility and stiffness of rubber and plastics hoses and tubing at sub-ambient temperatures. The standard defines three test methods (A, B and C) tailored to different bore sizes and hose types, and describes required apparatus, conditioning, test temperatures and the way to express results for consistent comparison and quality verification.

Key topics and technical requirements

• Scope by method
  • Method A: Torque-wheel bending for non-collapsible hoses with a bore ≤ 25 mm. Measures stiffness by comparing torque at standard and sub-ambient temperatures.
  • Method B: Mandrel bending for hoses and tubing with bore ≤ 100 mm. Assesses flexibility when bent around a mandrel; suitable for routine quality control.
  • Method C: Stiffness measurement for non-collapsible hoses/tubing with bore ≥ 100 mm.
• Test temperatures: Typical sub-ambient temperatures specified include 0 °C, −10 °C, −25 °C, −40 °C and −55 °C (±2 °C), or other temperatures specified in product standards.
• Apparatus & conditioning
  • Method A: torque wheel, strain gauge recorder, cooling container with agitator; coolant options include methanol/ethanol with dry ice or equivalent.
  • Method B: mandrel/former, conditioning chamber; special rig for >22 mm bores if bending outside chamber.
  • Method C: apparatus scaled for large-bore non-collapsible hoses.
• Test procedure essentials
  • Conditioning of specimens (24 h at test temperature) and additional apparatus conditioning.
  • Controlled bend angle and timing (e.g., 180° in specified seconds for smaller bores).
  • For Method A, stiffness S = (mean torque at test temperature) / (mean torque at standard temperature).
• Reporting requirements: method reference, hose description, specimen dimensions, coolant, temperatures, measured torques, stiffness values, deviations and test date.

Applications and users

• Who uses it: hose and tubing manufacturers, independent test laboratories, OEMs, R&D teams, and quality/inspection engineers.
• Why it matters: ensures hoses/tubing remain flexible and safe in cold environments (e.g., outdoor hydraulic lines, cryogenic transfer lines, cold-climate vehicle systems). Useful for product development, acceptance testing, routine quality control and specification compliance.

Related standards

• ISO 1402 - Hydrostatic testing of hoses and hose assemblies
• ISO 8330 - Vocabulary for rubber and plastics hoses and hose assemblies
• ISO 23529 - Conditioning of rubber test pieces

Keywords: ISO 10619-2:2021, rubber and plastics hoses, tubing, bending tests, sub-ambient temperatures, stiffness measurement, flexibility testing, torque wheel, mandrel, conditioning chamber, quality control.