Elastomer
An elastomer is a type of plastic with a fixed shape, but which can undergo elastic deformation. When it is subjected to tension and pressure, it undergoes elastic deformation, but when the deforming force is removed, it reverts to its original shape.
See Figs. 1 and 2 Elastomer
See Figs. 1 and 2 Elastomer

Fig. 1 Elastomer: Bellows-type mechanical seal

Fig. 2 Elastomer: Heat and oil resistance of elastomers in oil (ASTM oil, No. 3)
