Overview - ISO/TR 9705-2:2001 (Reaction-to-fire tests)
ISO/TR 9705-2:2001 is an informative Technical Report that provides the technical background and guidance for ISO 9705:1993 - the full-scale room test for reaction-to-fire of surface products. It explains how the ISO 9705 corner room test simulates early-stage fire growth (from ignition up to flashover) and gives practical guidance on selecting test procedures, interpreting results and using data in a total hazard analysis.
Keywords: ISO/TR 9705-2:2001, reaction-to-fire tests, full-scale room tests, surface products, fire testing, flashover, hazard analysis
Key topics and technical requirements
- Ignition sources
- Standard sandbox burner (0.17 m × 0.17 m) and an alternative box burner (0.3 m × 0.3 m per ASTM E603‑98) are characterised with mapped heat flux and gas temperature distributions.
- Guidance on burner position (corner vs wall), burner size and stand‑off distance and their influence on test severity.
- Specimen configuration
- Recommendations to line the walls (excluding the door wall) and ceiling with the product under test to achieve comparable, discriminating results.
- Heat balance and fire physics
- Energy balance concepts: heat release, convection through the doorway, conduction to structure, radiation, and stored gas heat.
- Example values and equations (e.g., propane net calorific value 46.4 MJ/kg) to relate burner mass loss to heat release.
- Measurements and instrumentation
- Techniques for measuring mass flow through the doorway, interface height, mass loss rate, and toxic gases (FTIR, ion chromatography).
- Sensitivity analyses and modelling
- Effects of burner size, lining configurations and burner placement; fire growth models; predictions of mass flow, filling time and mass loss.
- Precision and validation
- Results from ISO and ASTM round‑robin studies and annexed calculation examples to support repeatability and interpretation.
- Annexes
- Worked examples for HRR calculation from gas analysis, toxic gas measurement examples, and mass loss estimation.
Practical applications - who uses this standard
- Fire safety engineers and consultants for fire hazard analysis, modelling and risk assessments.
- Test laboratories developing or validating full‑scale reaction‑to‑fire tests.
- Building product manufacturers assessing surface product fire performance and comparing materials.
- Regulatory bodies and code officials using test guidance to refine acceptance criteria and test protocols.
- Researchers studying fire growth, smoke and toxicant production in room fires.
Related standards
- ISO 9705:1993 - Part 1: Full‑scale test for surface products (normative test method).
- ASTM E603‑98 - referenced alternative box burner specification.
- ISO/TC 92 - technical committee on fire safety (development context).
ISO/TR 9705‑2:2001 is an informative resource to interpret ISO 9705 test data, choose appropriate test configurations and integrate full‑scale test results into practical fire safety decisions.