Overview - ISO/TS 5658-1:2006 (Reaction to fire - Spread of flame)
ISO/TS 5658-1:2006 is a Technical Specification that provides guidance on flame spread tests and the underlying principles of flame spread. It classifies different flame-spread mechanisms for flat fuel surfaces and explains how bench‑scale, intermediate and large‑scale test results relate to real fire scenarios. The document is intended to help interpret flame‑spread data when assessing reaction‑to‑fire hazards for building materials, transport interiors, furniture and other products.
Key topics and technical requirements
- Scope and purpose: Guidance on measuring and interpreting flame spread rather than prescribing a single test procedure.
- Principles of flame spread: Factors affecting flame propagation, such as ignition source intensity, specimen orientation (vertical, horizontal, inclined), and local ventilation.
- Modes of flame spread: Classification by surface orientation and flow direction (e.g., wind‑aided vs opposed‑flow). The specification summarises characteristic modes (Table 1) used to relate tests to end‑use scenarios.
- Scale of testing:
- Small‑scale tests - bench methods referenced (e.g., ISO 5658-2, ISO 9239 series) for opposed‑flow configurations and material characterisation.
- Intermediate‑scale tests - corner tests and other mid‑scale methods (including ISO 5658-4 and ISO/TR 14696).
- Large‑scale tests - room corner and full‑scale scenarios (e.g., ISO 9705), façade and corridor/room interactions.
- Specific phenomena: Flame spread within assemblies, spread by flaming droplets/particles and their test characterisation.
- Use of test data: How small‑scale and large‑scale results can be combined in hazard analysis and fire growth evaluation.
Practical applications and users
ISO/TS 5658-1 is useful for:
- Fire safety engineers performing hazard analyses and specifying fire performance requirements.
- Test laboratories interpreting flame‑spread test results and advising on appropriate test selection.
- Manufacturers and product designers (building materials, transport interiors, furniture, electrical enclosures) wanting to understand how materials behave in realistic fire scenarios.
- Regulators, specifiers and architects applying reaction‑to‑fire criteria to ceilings, walls, floors, façades, corridors and assemblies.
Practical benefits:
- Improves selection of relevant test methods for end‑use orientation and ventilation conditions.
- Helps relate bench‑scale measurements to room and façade fire behaviour.
- Informs safer material placement (e.g., ceiling vs wall linings) and system design.
Related standards
Keywords: ISO/TS 5658-1:2006, reaction to fire, flame spread, flame spread tests, bench-scale, vertical spread, wind-aided, opposed-flow, fire safety.