Types of industrial naphthalene are classified primarily by molecular purity and functional substitution, a distinction that shapes pricing and end‑use performance. The base grade, technical‑grade naphthalene, typically contains 85‑95 % naphthalene and is allocated to low‑cost applications such as bulk chemical intermediates and certain pesticide blends. High‑purity naphthalene, with ≥99 % purity, is reserved for applications demanding strict compositional control, notably in polymer additives and high‑performance resins. Substituted variants—methyl naphthalene, dimethyl naphthalene, and tetralin (decahydronaphthalene)—are produced in smaller volumes but command premium prices due to their specialized roles as solvents, fuel additives, and intermediates for specialty chemicals. The market taxonomy also distinguishes between bulk liquid versus solid forms, influencing logistics and storage costs. Together, these type distinctions determine the cost structure and competitive dynamics within the industrial naphthalene market, reinforcing the relevance of precise segmentation for strategic planning.