Petroleum based Hydrocarbon Resin segmentation by type distinguishes four chemically defined families that together shape product performance and pricing dynamics. Aliphatic resins, derived from saturated feedstocks, exhibit low glass‑transition temperatures and superior flexibility, making them the preferred choice for soft‑grade adhesives and pressure‑sensitive label formulations; they represent roughly 30 % of type‑specific volume. Aromatic resins, sourced from cracked aromatics, provide higher Tg, hardness, and solvent resistance, driving demand in high‑performance inks and automotive coatings and accounting for about 40 % of the market. Mixed‑aliphatic/aromatic hybrids combine the elasticity of aliphatic units with the rigidity of aromatic blocks, delivering balanced tack and durability; this hybrid class occupies roughly 20 % of sales, especially in rubber tackifiers and multi‑layer packaging laminates. Finally, hydrogenated variants, produced through catalytic saturation, deliver enhanced oxidative stability and longer service life, capturing the remaining 10 % and finding niche use in outdoor‑exposed coatings and high‑temperature adhesives. Within each family, sub‑grades—low, medium, and high molecular weight—fine‑tune viscosity and solid content, further stratifying the market and reinforcing the overall Petroleum based Hydrocarbon Resin taxonomy.