The types segment of the Isoprene Rubber (IR) market is organized around the polymer’s molecular configuration and synthesis route, primarily distinguishing natural and synthetic IR. Natural IR, derived from Hevea brasiliensis latex, is predominantly cis‑1,4‑polyisoprene, delivering superior elasticity and low hysteresis, which sustains its relevance in premium tire compounds despite higher raw‑material costs. Synthetic IR is engineered via polymerization of isoprene monomers, yielding variants such as synthetic cis‑1,4‑polyisoprene, trans‑1,4‑polyisoprene, and high‑cis content grades. Synthetic cis‑1,4 mirrors natural performance but offers controlled purity and consistent supply, capturing a growing share of the market as automotive OEMs prioritize supply chain stability. Trans‑1,4 variants provide enhanced thermal stability for specialized industrial seals, while high‑cis grades are tailored for medical and food‑contact applications requiring stringent regulatory compliance. The relative contributions of these types are reflected in production volumes, with natural IR maintaining a modest lead, while synthetic grades expand rapidly in response to application‑specific performance criteria.