ISO 10619-1:2017

Overview

ISO 10619-1:2017 specifies standardized bending tests at ambient temperature to measure the flexibility and stiffness of rubber and plastics hoses and tubing. The document defines three deformation-based flexibility methods (A1, B, C1) and two force-based stiffness methods (A2, C2). These methods apply to different hose internal diameter ranges and allow testing under unpressurized, pressurized or vacuum conditions where applicable.

Key topics and technical requirements

• Test methods
  • Method A1 (flexibility): compression between two plates, measures reduction in outside diameter. Suitable for hoses/tubing with inside diameter up to and including 80 mm.
  • Method A2 (stiffness): force required to reach a specified bend radius while compressed between plates; can be performed at a specified internal pressure. Applicable up to 80 mm ID.
  • Method B (flexibility): bending around a mandrel; final mandrel diameter can be taken as the minimum bend radius. Suitable up to and including 100 mm ID. Can be run with hose unpressurized, pressurized, or under vacuum.
  • Methods C1 (flexibility) and C2 (stiffness): for hoses/tubing with 100 mm and greater inside diameter, measured at the minimum bend radius.
• Measurement outputs
  • Deformation expressed as ratio T/D (minimum outside dimension in curve / average outside diameter).
  • Stiffness measured as force to attain a specific bend radius (and flexural stiffness for C2-note that units/formula were updated in the 2017 revision).
• Sample preparation and conditions
  • No test within 24 hours of manufacture; conditioning for at least 16 hours at standard laboratory temperature/humidity per ISO 23529.
  • Standard test temperature/humidity references given; apparatus and number of test pieces (typically two) specified.
• Reporting
  • Test report must reference ISO 10619-1:2017, state the method used and include required test data and conditions.

Practical applications and users

• Hose and tubing manufacturers - product development and quality control to verify flexibility, minimum bend radius and bending resistance.
• Independent test laboratories - provide certified test data for customer specifications and compliance.
• Specifiers and purchasers - select hoses/tubing suited to installation bend requirements and service conditions.
• R&D and design engineers - compare materials, constructions and pressure effects on bending behaviour.
• Regulatory and procurement bodies - include in procurement specifications and conformity assessment.

Related standards

• ISO 4671 - measurement of hose dimensions and lengths
• ISO 8330 - vocabulary for rubber and plastics hoses and assemblies
• ISO 23529 - conditioning and preparation of rubber test pieces

Keywords: ISO 10619-1:2017, bending tests, flexibility, stiffness, rubber and plastics hoses, tubing, minimum bend radius, flexural stiffness, hose testing, ambient temperature.