Evolution of Aerosol Fire Suppression: Comparative Technical Analysis of Pressed-Powder Technologies and the RadEX Material Platform (2025)
Based on the official protocol of the State Finnish Fire Academy (Pelastusopisto), PeODno 2025-133, and other formal evaluations
Disclaimer
This publication, the creation of the RadEX prototype, and the related testing activities have no commercial purpose and no intent to discredit existing technologies. The sole objective is to demonstrate that, like all technical systems, current aerosol fire suppression solutions require modernization — and that such modernization is possible, feasible, and capable of saving thousands of lives and significant operational costs for end users.
1. Material Basis and Structural Differences
Conventional aerosol fire suppression units are based on a technology developed in the 1960s: pressed disks composed of powdered chemical mixtures. This architecture inherently exhibits low material density, internal porosity, mechanical instability under vibration, and high hygroscopicity. During operation, these systems release toxic byproducts due to both the chemical composition of the charge and the thermomechanical degradation process. Because of these structural weaknesses, such units require complex cooling systems, particulate filtration, and additional mechanisms to reduce toxic emissions.
By contrast, the RadEX platform is formed using a method of thermodynamically initiated phase transformation, resulting in a monolithic and homogeneous structure that lacks any of the physical vulnerabilities associated with pressed-powder designs. RadEX contains no binders, demonstrates complete resistance to mechanical shock and vibration, and is entirely non-hygroscopic — maintaining its structural and chemical stability even during prolonged immersion in water. It requires no complex cooling assemblies or toxic gas mitigation systems. The extinguishing mechanism is based on the release of free radicals, not on oxygen displacement.
2. Mass Efficiency
According to the testing protocol of the State Finnish Fire Academy, conventional pressed-powder units require more than 200 grams of active chemical agent to suppress fire in a 2 m³ enclosed volume. The RadEX prototype achieves comparable extinguishing performance in the same volume using only 20 grams of active material — an order-of-magnitude reduction in required mass, without the use of oxidizers, pressurization, or external cooling.
3. Status of Tested Samples
The RadEX sample used in the referenced trials was a laboratory prototype, constructed exclusively for comparative analysis. It did not contain oxidizers, had no integrated ignition device, and operated without any thermal or chemical compensators. It was ignited manually for test purposes only. Its thermal behavior is not representative of a finalized commercial product.
By contrast, the reference device used for comparison was a certified commercial product containing oxidizing agents, a factory-integrated ignition system, and a complete cooling and filtration assembly. These systems were certified under UL 2775, EN 15276-1, and equivalent national standards, by organizations such as UL, BSI, and TÜV Rheinland.
For this reason, direct thermal comparisons between the two are not methodologically valid.
4. Toxic Gas Generation and Safety Thresholds
The toxicity assessment focused on carbon monoxide (CO) and nitrogen oxide (NO), with reference to internationally recognized exposure thresholds:
- AEGL-3 (30-minute) for CO: 600 ppm
- IDHL (Immediately Dangerous to Life or Health) for CO: 1200 ppm
- IDHL for NO: 100 ppm
The RadEX prototype produced CO concentrations between 440 and 590 ppm, and NO concentrations between 130 and 170 ppm, with oxygen levels maintained at 20.9%. These results remain below IDHL for CO and are substantially lower in total toxic load compared to conventional devices.
In contrast, the certified reference unit produced CO levels up to 8000 ppm and NO levels up to 960 ppm, with oxygen levels dropping to 19.1%. According to the Finnish Fire Academy protocol, these figures exceed the IDHL for CO by a factor of 6.7 and for NO by a factor of nearly 10. These results were formally recorded by an accredited testing team using certified measuring equipment.
5. Aerosol Particle Emissions
Measurements of total solid aerosol concentration showed values up to 7.2 g/m³ for the conventional device and up to 2 g/m³ for the RadEX prototype. The broader variation in the conventional system reflects the non-uniform nature of pressed-powder combustion, while RadEX showed consistent and stable emission behavior.
6. Structural Durability and Operational Reliability
Pressed-powder aerosol generators inherently degrade under vibration and impact. The granular structure is susceptible to microfractures, delamination, and moisture penetration, all of which negatively affect combustion uniformity, increase toxic output, and reduce long-term reliability. These issues necessitate complex structural and chemical compensations, increasing cost and reducing robustness.
RadEX, as a solid monolithic structure, is physically impervious to such damage. It retains stable properties under transport, vibration, or storage — even underwater. It does not require complex cooling systems or toxicological compensators. This results in simpler design, improved reliability, and significantly lower production and lifecycle costs.
7. Cost Implications
The need for auxiliary systems in conventional devices — including cooling blocks, reinforced housings, filters, and excess chemical mass — results in high total system cost. The complete cost of such systems may exceed that of a RadEX-based solution by a factor of 10 to 20.
8. Final Conclusion
The legacy pressed-powder technology is structurally outdated, inherently hazardous, and incapable of guaranteeing safety even when supplemented with complex compensating mechanisms. As confirmed by government-level testing in Finland, the United Kingdom, and the United States, and by publicly documented incidents involving fatalities, no amount of engineering compensation can overcome the fundamental weaknesses of this design class.
RadEX demonstrates that:
- performance can be significantly improved with 10× less mass,
- toxic output can be reduced by an order of magnitude,
- and system complexity can be radically simplified without sacrificing safety.
This is not a modification of existing systems — it is a transition to a fundamentally new class of materials, offering a realistic and necessary path forward for safe, efficient, and modern fire suppression.
The official protocol issued by the State Finnish Fire Academy (Pelastusopisto), under reference number PeODno 2025-133, is attached to this publication.
