Within the market taxonomy, window seals are classified by type into silicone, polyurethane, butyl, and EPDM (ethylene propylene diene monomer) variants. Silicone seals, prized for temperature resilience and UV stability, capture the largest share, roughly 40%, owing to their suitability across all application segments, especially high‑performance commercial projects. Polyurethane seals represent about 25% of the market, offering superior elasticity and cost‑effectiveness for residential retrofits. Butyl seals, contributing 20%, are favored in industrial settings where chemical resistance and airtightness are paramount. EPDM seals occupy the remaining 15%, primarily utilized in applications requiring excellent weatherability and longevity, such as coastal commercial structures. The distribution of these types aligns with the functional demands of each application segment, directly impacting the aggregate market size by dictating material sourcing, manufacturing complexity, and pricing structures.