It also has a very low surface energy (which is what gives cookware coatings the nonstick feature), and possesses the quality of being inert to virtually all chemicals. Examples of fluoropolymers: PTFE (polytetrafluoroethylene) PFA (perfluoroalkoxy) FEP (fluorinated ethylene-propylene)
The Marshall Orr House was built in 1885 by Dr. Samuel Marshall Orr, as a smaller replica of the home of his father, Governor James L. Orr. Gov. Orr's home, known locally as Forest Home and Arlington was demolished in 1956. A physician in Anderson for 35 years, Dr. Orr owned a pharmacy, was involved with Anderson's first building and loan association and served as vice-president of the Farmers and Merchants Bank. In the community, he served as a trustee of Anderson schools and was a vestryman of Grace Episcopal Church for twenty years.
He was the first sheriff of Centre Co. October 28, 1800, he built Elk Mills, at Millheim (later Mussers), 1817, and rebuilt Spring Mills in 1822. He took John Forster into partnership and the firm of Duncan & Forster was known all through western Pennsylvania.