Segmentation by type differentiates the market into three chemically distinct HFO blowing agents: HFO‑1233zd(E), HFO‑1336mzz‑Z, and blends incorporating minor proportions of low‑GWP hydrocarbons. HFO‑1233zd(E) holds the largest share, approximately 55%, due to its balanced vapor pressure, low ozone‑depletion potential, and established supply chain, making it the preferred choice for large‑scale insulation projects. HFO‑1336mzz‑Z accounts for around 30%, favored in applications requiring higher thermal conductivity and rapid cure rates, such as automotive elastomers. Blends, comprising roughly 15% of the market, are engineered to fine‑tune foaming kinetics and cost, enabling manufacturers to meet niche performance specifications without extensive process redesign. The relative contribution of each type is reflected in capital expenditure patterns, where the dominance of HFO‑1233zd(E) drives bulk procurement, while the growth of HFO‑1336mzz‑Z and blends signals emerging opportunities in high‑performance and cost‑optimized segments of the Polyurethane HFO Blowing Agents market.