Overview
ISO 17554:2014 - Reaction to fire tests - Mass loss measurement - specifies a small-scale laboratory method to assess the mass loss rate and time to ignition of essentially flat specimens exposed horizontally to controlled radiant heating with an external igniter under well-ventilated conditions. The method measures specimen mass over time and derives mass loss numerically. While mass loss rate can serve as an indirect indicator of heat release rate for many products, ISO 17554 is not intended as an apparatus for direct determination of heat release - products requiring accurate heat release data should be tested to ISO 5660‑1 (cone calorimeter method).
Key technical topics and requirements
- Specimen orientation and type: Tests use essentially flat specimens (surface irregularity ≤ ±1 mm) placed in the horizontal orientation; suitable specimen preparation, conditioning, and mounting are specified.
- Apparatus essentials:
- Cone-shaped radiant electrical heater (active element delivering up to 5 000 W).
- Weighing device (load cell) for continuous mass measurement.
- Specimen holder and retainer frame, spark ignition circuit and ignition timer.
- Heat flux meters and a data collection/analysis system.
- Exhaust system with controlled ventilation (document notes an exhaust flow criterion).
- Measured outputs:
- Time to ignition (onset of sustained flaming).
- Mass loss rate (instantaneous, average values between defined mass-loss percentages, and peak values).
- Calibration and validation: Procedures for heater calibration, heat flux meter calibration, weighing-device response and drift checks, and irradiance control are included to ensure repeatability and accuracy.
- Test environment and suitability: Guidance on which products are appropriate for this method (e.g., not suitable for some composites or materials with short burning times or products whose mass loss poorly correlates with heat release).
Practical applications and who uses the standard
ISO 17554 is used by:
- Fire test laboratories conducting reaction-to-fire screening and product classification.
- Manufacturers and R&D teams in building materials, textiles, furniture, transport interiors, and polymer products for early-stage fire performance assessment.
- Safety engineers and regulatory bodies for comparative evaluation of materials where mass loss rate is a meaningful proxy for flammability or burning behaviour.
- Product development teams seeking reproducible small-scale test data prior to larger-scale testing (e.g., ISO 5660‑1).
Practical benefits include cost-effective screening, standardized procedures for repeatable mass-loss metrics, and useful inputs to risk assessment when heat release data are not required.
Related standards
- ISO 5660‑1 - Reaction-to-fire tests - Heat release, smoke production and mass loss rate - Part 1: Heat release rate (cone calorimeter method) - for direct heat release measurements.
- ISO 13943 - Fire safety - Vocabulary - for definitions used throughout ISO 17554.
- Calibration references: ISO 14934-3, ISO 14697 (substrate guidance).
