DuPont Performance Elastomers, LLC manufactures and supplies general purpose and specialty elastomer products. Viton, the first fluoroelastomer, grew out of Dr. Dean R. Rexford's (1915-1997) research of DuPont's Organic Chemicals Department in 1954. The material proved remarkably stable when exposed to chemicals, oils, solvents, and high temperatures, making it ideal for seals, gaskets, O-rings, and similar components in the aerospace and automotive industries. This collection contains materials relating to the history of Viton fluoroelastomer assembled for its 50th anniversary in 2007. They include advertisements, trade catalogs, a copy of the original patent, and a company chronology of developments with Viton between 1954 and 1975.