ISO 12136:2011

Overview

ISO 12136:2011 - "Reaction to fire tests - Measurement of material properties using a fire propagation apparatus" defines small‑scale test methods to quantify material flammability characteristics using a Fire Propagation Apparatus (FPA). The standard measures properties used in fire safety engineering and fire modelling, including time to ignition, heat release rates, mass loss rate, effective heat of combustion, heat of gasification and smoke yield. Tests can be performed in normal air or controlled gas mixtures (including oxygen enrichment up to 40 %) and use radiant heating up to 65 kW/m².

Key topics and technical requirements

• Four independent test procedures
  • Ignition test (time to ignition of horizontal specimens under set radiant flux)
  • Combustion test (chemical and convective heat release rates, smoke generation from horizontal specimens)
  • Pyrolysis test (mass loss rate and heat of gasification using inert atmospheres)
  • Fire‑propagation test (chemical heat release during upward spread on vertical specimens)
• Apparatus and instrumentation
  • Fire Propagation Apparatus (FPA) with tungsten‑quartz radiant heaters to deliver a stable external heat flux
  • Gas analysis (CO2, CO, optional hydrocarbon analysers, inlet oxygen analyser)
  • Load cell system for mass loss, Pitot/pressure probes for exhaust flow, heat flux gauges, thermocouples and digital data acquisition
  • Options for vertical or horizontal exhaust duct arrangements (horizontal configuration yields equivalent results per Annex C)
• Calibration and procedure controls
  • Routine calibration of radiant heaters, gas analysers and load cells; heat release calibration methods specified
  • Specimen conditioning, geometry and holder requirements (e.g., vertical specimens described for propagation tests, typical height referenced)
• Limitations and safety
  • Vertical propagation test is not suitable for materials that melt and form significant liquid pools
  • Clause 7 addresses laboratory safety and exhaust operation - users must implement appropriate health and safety practices

Applications and users

ISO 12136:2011 is used by:

• Fire testing laboratories and accredited test houses performing reaction‑to‑fire characterization
• Fire safety engineers and modelers requiring material input data for fire growth and smoke models
• Product and materials manufacturers (building products, cables, textiles, polymers) assessing flammability and compliance
• Regulatory bodies and standards developers comparing small‑scale test data against large‑scale behavior (oxygen enrichment is used to better simulate large‑scale flame heat flux in some correlations)

Practical uses include deriving heat release and smoke production rates for performance specifications, fire hazard assessment, fire model boundary conditions, and R&D for flame retardant treatments.

Related standards and references

• ISO 13943 - Fire safety: vocabulary
• ISO 14934‑3 - Calibration and use of heat flux meters (secondary method)
• ISO 12136 cites relevant methods and background from ASTM E2058 and NFPA 287

Keywords: ISO 12136:2011, fire propagation apparatus, reaction to fire tests, heat release rate, time to ignition, mass loss rate, heat of gasification, smoke yield, fire safety engineering, fire modelling.