The Euclid Chemical Company is a Cleveland, Ohio-based manufacturer of specialty chemical products and technical services for the concrete and masonry construction industry, including admixtures, fiber reinforcement, concrete repair products, flooring and decorative concrete systems. It was founded in 1910 as Klein Building Products Company and has been a subsidiary of RPM International since 1984. Rusty Maglionico became president in September 2026, succeeding Tom Gairing.