Overview
ISO 25308:2026 provides a standardized test method for determining gas-leakage resulting from assembly faults in rubber and plastics hose assemblies and tubing assemblies. Developed by the International Organization for Standardization (ISO), this document specifically addresses leakage occurring at the interface between the hose or tubing and its end fitting due to assembly errors, rather than leaks through the material body itself (permeation). Adherence to this method ensures that manufacturers, testers, and quality assurance professionals can consistently measure and report leakage rates, promoting improved product safety and reliability in various industrial applications.
Key Topics
- Gas-leakage Testing: Defines procedures for measuring the volume of gas lost at the connection points between hoses/tubing and their end fittings.
- Assembly Fault Detection: Focuses specifically on leaks caused by improper assembly, distinguishing them from permeation through the hose material.
- Test Conditions and Equipment: Outlines requirements for test pieces, including length and type of fitting, as well as conditioning prior to testing.
- Measurement and Reporting: Sets standards for apparatus calibration, gas selection (air, nitrogen, helium, or hydrogen), temperature control, and precise data recording.
- Safety Guidance: Recommends proper laboratory practices and risk mitigation strategies during testing.
Applications
The methodology specified in ISO 25308:2026 has practical applications across industries where rubber and plastics hose assemblies and tubing assemblies are employed under pressurized gas conditions. Common sectors include:
- Automotive and Aerospace: Ensuring the integrity of gas lines, brake hoses, or air conditioning conduits.
- Industrial Manufacturing: Evaluating flexible connections in pneumatic systems, chemical handling, or gas delivery setups.
- Medical and Laboratory Equipment: Assessing gas-leakage in medical devices and lab apparatus where precise gas flow is critical.
- Fuel and Energy: Inspection and quality control for hoses used in gaseous fuel dispensing and transmission.
By detecting assembly faults early, organizations can:
- Reduce the risk of hazardous gas leaks
- Meet regulatory and safety compliance
- Extend the service life of hose assemblies
- Minimize downtime and maintenance costs
Related Standards
For comprehensive quality assurance in hose and tubing testing, the following standards are closely related to ISO 25308:2026:
- ISO 8330: Rubber and plastics hoses and hose assemblies - Vocabulary
Defines terminology for hoses, fittings, and testing.
- ISO 23529: Rubber - General procedures for preparing and conditioning test pieces for physical test methods
Provides guidelines for sample preparation and conditioning.
- ISO 4080: Determination of permeability to gas
Focuses on measuring gas permeation rates through hose materials.
- ISO 8066-3: Hose assemblies for automotive air conditioning - Refrigerant 1234yf
Specifies requirements for automotive hose assemblies for specific refrigerants.
- ISO 9090: Gas tightness of equipment for gas welding and allied processes
Outlines test procedures for ensuring gas tightness in welding equipment.
- ISO 19880-5: Gaseous hydrogen - Fuelling stations - Dispenser hoses and hose assemblies
Details standards for hydrogen fuel dispensing hoses.
Practical Value
Implementing ISO 25308:2026 gives manufacturers, quality assurance teams, and end users a clear, consistent process for identifying and quantifying gas-leakage due to assembly issues in hoses and tubings. Adoption of this standard supports safer product design, aids compliance with industry regulations, and fosters trust throughout the supply chain in the performance and reliability of flexible gas-handling assemblies.