Abstract: The formation of a foamy reaction layer is a critical phenomenon in the combustion of Aerosol Forming Compositions (AFC), influencing both combustion dynamics and fire suppression efficiency. This study investigates the mechanisms driving foamy layer formation and its impact on combustion properties. The foamy reaction layer, a complex region characterized by gas bubbles embedded in a semi-liquid matrix, acts as a thermal insulator, regulates flame propagation, and enhances mechanical stability during combustion.