Overview
ISO 10619-3:2011 - published by ISO - defines a standardized laboratory method for measuring the bending characteristics (flexibility and stiffness) of rubber and plastics hoses and tubing at low and high temperatures. The method covers tests between −60 °C and +200 °C and is intended for small-bore hoses and tubing (internal diameter up to 12.5 mm). Primary outputs include the force required to bend specimens and dimensional changes expressed as the T/D ratio (minimum bent diameter T over unbent outer diameter D).
Key topics and technical requirements
- Scope and limits
- Applies to rubber and plastic hoses/tubing with small internal diameters (≤ 12.5 mm).
- Temperature range: −60 °C to +200 °C.
- Test apparatus
- Compression testing machine with a mobile jaw travel speed of 100 mm/min (ideally with a recorder).
- Twin “gutter” supports with end stops and a temperature-controlled (thermostatted) enclosure that allows measurement access.
- Specimen preparation and conditioning
- Tests performed not less than 24 hours after manufacture; conditioning in the thermostat for 5 hours at the test temperature (in unbent or natural curvature).
- Conditioning of the test apparatus to the same temperature as specimens for elevated-temperature tests.
- Test procedure
- Install two matched specimens per series; perform typically three series (each series = two specimens).
- Measure unbent outer diameter D (three readings averaged) and measure the minimum outer diameter T at the bent region (six readings averaged).
- Apply bending force, determine force to reach the specified minimum curvature (twice the minimum radius), divide recorded force by two to obtain single-specimen bending force.
- Results and reporting
- Calculate T/D and compare with allowable deformation specified for the hose.
- Test report must reference ISO 10619-3:2011 and include method details, specimen description, temperature, observations, D, T, T/D, bending force (if applicable), and test date.
Applications and users
ISO 10619-3:2011 is used for:
- Quality control and production testing by hose and tubing manufacturers.
- Material selection and performance verification in R&D for elastomeric and plastic hoses.
- Independent test laboratories and OEMs requiring evidence of hose performance under temperature extremes.
- Compliance checks against product specifications where flexibility and resistance to kinking, flattening or cracking must be assessed.
Related standards
- ISO 10619 (Parts 1 and 2) - other bending test conditions (ambient and lower-than-ambient).
- ISO 4671 - dimensional measurement methods for hoses.
- ISO 8330 - vocabulary for rubber and plastic hoses.
- ISO 23529 - specimen preparation and conditioning procedures.
Keywords: ISO 10619-3:2011, bending tests, rubber and plastics hoses, measurement of flexibility, stiffness, high and low temperature testing, T/D ratio, small-bore hoses, hose testing standard.
Open preview (PDF)Rubber and plastics hoses and tubing — Measurement of flexibility and stiffness — Part 3: Bending tests at high and low temperatures