Elastomer 7 : Any of the class of materials, including natural and synthetic rubbers, which return to their original shape after being subjected to large deformations. (RP 2T)
The Mudblogger (Oilfield, Energy and Related Photographs), Oil Field Glossary, TX, USA 2014. http://mudblogger.com/oilfield-glossary/, (Oil - Amer) {777}