Robert R. Radcliff (1916-2006) joined E.I. du Pont de Nemours & Co. as a chemist in 1945. As later division head for new products development at the Rubber Laboratory, later the Elastomers Laboratory at Chestnut Run, his principal achievement was developing the maleimide curing system for making "Hypalon" artificial rubber. The papers in this collection are a small selection of professional materials preserved by Dr. Radcliff and his family.