The Cyanate Ester segmentation by application distinguishes four primary end‑use groups that together drive the market’s revenue distribution. Aerospace & Defense accounts for roughly 40 % of sales, reflecting the material’s superior thermal stability and low dielectric loss, which are critical for high‑performance composite structures and radome components. Electronics & Semiconductors represents about 30 % of the market, where cyanate ester resins are employed in printed circuit boards, IC substrates, and high‑frequency connectors due to their excellent fire‑retardancy and moisture resistance. Automotive contributes an estimated 20 %, focused on lightweight structural parts, electric‑vehicle battery enclosures, and under‑hood applications that demand high heat‑deflection temperatures. Finally, Industrial Machinery captures the remaining 10 %, supporting motor casings, pump housings, and chemical‑processing equipment that benefit from the resin’s chemical inertness. These percentages are reflected in the accompanying pie‑chart, illustrating how each application segment underpins the overall market size.