Methyl Ethyl Ketone Peroxide (MEKP) segmentation by application reveals four primary demand drivers: polyester resin systems, vinyl‑ester resin systems, fiberglass‑reinforced plastic (FRP) construction, and composite‑manufacturing processes. In polyester resin formulations, MEKP acts as the primary free‑radical initiator, accounting for roughly 38 % of total volume because of the extensive use of polyester in automotive body panels, marine hulls, and sheet‑molding compounds. Vinyl‑ester resins, favored for superior chemical resistance, represent about 24 % of consumption, driven by the petrochemical and corrosion‑resistant tank market. FRP construction, which integrates resin systems with glass fiber reinforcement for infrastructure and wind‑energy blades, contributes near 21 % of the market, reflecting the growth in renewable‑energy installations. Composite‑manufacturing, encompassing high‑performance carbon‑fiber composites for aerospace and defense, holds the remaining 17 %, where stringent curing kinetics demand specialized MEKP grades. Together, these application segments define the overall market size, with each proportion reflecting both end‑use volume and price differentials.