Plastomers are called engineering plastics too for areas of usage. There is no cross-linking structure in plastomers, unlike elastomers. So, although it is capable of deforming under load and returning to its original position, its speciality is much weaker than elastomers.
Thermoplastics with strong mechanical properties are used for metal materials unlike softer thermoplastics compete with elastomers in applications, and they are used in many different applications including sealing elements.
In seals, generally used plastomers are polyacetal (POM), polyamide (PA), polytetrafluoroethylene (PTFE or known as trade name Teflon®) materials. TPE (thermoplastic elastomer) is thermoplastic in structure, but it is a special material can be classified as an elastomer with its properties and performance.