In terms of types, C5 petroleum resins are classified primarily into aliphatic, aromatic, and hydrogenated grades, each further divided into sub‑categories based on molecular weight and acid value. Aliphatic resins (low‑to‑moderate molecular weight) are prized for superior flexibility and low yellowing, making them suitable for clear coatings and inks. Aromatic resins (higher molecular weight) provide enhanced hardness and solvent resistance, aligning with demanding adhesive formulations. Hydrogenated resins undergo saturation to improve oxidative stability, extending service life in outdoor coatings and elastomeric applications. A fourth niche, polymer‑modified resins, incorporates co‑monomers to tailor viscosity and compatibility, addressing specialized performance criteria across all application segments. The relative market share of each type mirrors the demand distribution outlined in the application chart, with aliphatic and aromatic grades together covering over 80 % of total volume, while hydrogenated and polymer‑modified variants capture the remaining niche demand.