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What began as a small Pittsburgh cork-cutting shop grew into one of America’s best-known industrial brands. Over time, the company expanded far beyond bottle stoppers, helping shape markets for flooring, ceilings, insulation, and glass products.

by Frank Alvah Parsons, Kathleen Clinch Calkins, Armstrong Cork Company
Founded in Pittsburgh in 1860 by Thomas Armstrong and John P. Glass, Armstrong Cork Company started by making hand-carved corks for bottles and other containers. The business grew quickly, and by the late 19th century it had become a major supplier of cork products in the United States.
As the company expanded, it moved into new materials and building products, including linoleum flooring, insulation, and acoustical products. Its headquarters eventually moved to Lancaster, Pennsylvania, and the Armstrong name became widely recognized in American homes, schools, and commercial buildings.
Over the years, the company evolved with changing industries and technologies. Its legacy continued through later corporate forms, especially Armstrong World Industries, which carried the historic Armstrong brand into modern building products.