The Types classification categorizes foaming gases by their chemical basis and environmental profile, comprising polyol‑based, hydrofluorocarbon (HFC), hydrofluoroolefin (HFO), carbon‑dioxide (CO₂), and water‑blown gases. Polyol‑based gases are integral to polyurethane foams, offering high reactivity and cell‑structure control, which sustains their dominance in high‑performance applications. HFC gases, historically favored for their low toxicity and high blowing efficiency, are now facing regulatory pressure due to high global warming potential, prompting a gradual market shift. HFO gases emerge as lower‑impact alternatives, delivering comparable performance with reduced environmental footprints, thereby capturing growth in regions with strict emissions policies. CO₂ foaming gases present a natural, non‑flammable option, increasingly adopted in sustainable formulations despite higher processing costs. Water‑blown gases, leveraging water vapor as a blowing agent, support eco‑friendly foams but are limited to specific polymer systems. Each type’s market contribution is determined by regulatory trends, cost structures, and performance requirements, collectively defining the market taxonomy for foaming gases.