MP321 is a HPU material with hardness 95 Shore A. The polyurethane polymer industry has enormous categories of products for a wide variety of applications. Polyurethane used in the seal industry is a thermoplastic elastomer (HPU). As the name suggests, it behaves like an elastomer but the chemistry is of a thermoplastic. The elasticity of a HPU is brought about through polymer morphology phase changes as in thermoplastics not through vulcanization as seen in other elastomers. Because of its thermoplastic nature, HPU has excellent tensile strength and abrasion resistance that other elastomers are unable to match. Meanwhile, HPUs also have good flexibility and shock absorbing performance. An additional advantage of HPUs is that they can be molded using conventional thermoplastic processes.