Overview
ISO 9380:1990 - "Doorsets - Repeated torsion test" defines a laboratory test method to determine the effect of repeated torsional loading on doorsets and their hardware. The standard applies to vertically hinged doors in their normal installed condition and is intended to evaluate deformation, change in stiffness and any damage after cyclic torsional loading.
Key topics and requirements
- Test purpose: Assess the response of a doorset (doorleaf and associated hardware) to repeated torsion applied to the free lower corner on the lock side while the upper corner is fixed.
- Specimen setup: Install the doorset in a stiff surround to simulate normal operating conditions; fix the free upper corner of the lock side at a point 50 mm from each edge.
- Static loading: Apply a static transverse load of 100 N at the lower free corner for 5 minutes and measure deformation with an accuracy of ±0.1 mm (before and after cycling).
- Dynamic loading: Subject the lower free corner to a sinusoidally varying torsional deformation at 0.5 Hz, for 2 500 cycles. Amplitude of the applied deformation is selected according to the doorset’s performance requirements.
- Pause and re-measure: After cycling, allow a 10-minute pause, then reapply the 100 N static load and measure residual deformation.
- Measurements and reporting: Record initial and final deformation values, applied deformation, and the change in stiffness (absolute difference between pre- and post-test deformation). Report all relevant doorset details, mounting method, hardware type, and any observed damage.
Practical applications and users
ISO 9380 is useful for:
- Doorset manufacturers - to validate durability and mechanical integrity during product development and quality control.
- Independent test laboratories - to perform standardized performance tests for certification and compliance.
- Architects and specifiers - to compare doorset options and specify required performance levels for building projects.
- Hardware designers and suppliers - to assess hinge, lock and frame performance under torsional stress.
- Building inspectors and facility managers - to investigate failure modes and establish maintenance or replacement criteria.
Typical use cases: durability testing for heavy-use doors, verification of hardware robustness, product conformity testing for procurement specifications, and R&D evaluation of new materials or hinge designs.
Related standards
Keywords: ISO 9380, doorsets, repeated torsion test, torsion testing, door durability, door hardware testing, door performance, building standards.
