The Application segment of the Refrigerant Grade IsoButane market is divided into four principal end‑uses: domestic refrigeration, commercial refrigeration, automotive air‑conditioning, and industrial cooling. Domestic refrigeration, encompassing household refrigerators and freezers, accounts for roughly 40 % of total demand, driven by widespread adoption of low‑GWP refrigerants in residential appliances. Commercial refrigeration—covering supermarkets, convenience stores, and food‑service equipment—contributes about 30 %, reflecting regulatory pressure to replace high‑global‑warming‑potential alternatives in retail environments. Automotive air‑conditioning, primarily for light‑duty vehicles, represents 20 % of the market, as automakers shift toward hydrocarbon refrigerants to meet stringent emissions standards. Industrial cooling, which includes process chillers and cold‑storage warehouses, holds the remaining 10 %, a niche yet growing segment due to heightened energy‑efficiency mandates. Collectively, these application categories shape the overall market size, and their relative weights are captured in the accompanying Refrigerant Grade IsoButane segmentation chart.