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Traditional fire testing methods often require large samples, open flames, or complicated setups to study combustion. This technology introduces a compact, precise method using a Microscale Fire Calorimeter (MFC) that mimics realistic fire conditions with unprecedented control. When a solid material is thermally decomposed (pyrolyzed), it emits gaseous byproducts. These gases are then premixed with oxygen and combusted in the MFC’s reaction zone at high temperatures, without a visible flame. The MFC system precisely regulates oxygen availability, simulating different fire stages such as over-ventilated (oxygen-rich) and under-ventilated (oxygen-poor) conditions. This allows researchers to analyze how combustion chemistry changes as fires become more intense or oxygen-deprived. The system captures and quantifies the resulting gases and soot, enabling evaluation of environmental pollutants and toxic species produced during each combustion phase. This approach supports safer, smaller-scale laboratory testing while providing valuable data for applications such as material development, regulatory compliance, and forensic analysis. It bridges the gap between benchtop research and real-world fire scenarios.