Exothermic Atmosphere Generators are classified primarily by the chemical composition of the reactive media, a categorization that drives distinct cost structures, performance metrics, and end‑user adoption rates. The sodium bicarbonate‑based segment dominates the market, accounting for roughly 55 % of total shipments, because its by‑products are non‑corrosive and the reaction temperature is moderate, making it suitable for a broad range of facilities. Potassium carbonate‑based generators represent about 25 % of the market; they generate higher temperatures and CO₂ output, which is advantageous for rapid inerting in high‑hazard environments such as petrochemical plants. The hybrid segment, combining sodium bicarbonate with potassium carbonate, holds roughly 15 % of sales, offering a balance between temperature control and gas generation efficiency for niche applications. Finally, liquid‑phase exothermic generators, although a nascent technology, capture the remaining 5 % and are gaining traction in compact, retro‑fit installations where space constraints preclude solid‑media systems. Together, these type categories form the backbone of the Exothermic Atmosphere Generators market, each contributing proportionally to overall market size.