Elastomers are rigid, usually soft, but always elastically deformable under load. After stress, elastomers return to their initial shape.
When heated, elastomers do not become plastic (and are not deformable), and will not melt. At high temperatures decomposition takes place and the material is destroyed. Elastomers are non-meltable, non- weldable, and insoluble, but they are resolvable.
The elasticity of an elastomer material is defined by the degree of cross-linking. The linking process is called vulcanization or curing. Vulcanized elastomers are also called “rubber”.