PEEK or Polyetheretherket one is a semi-crystalline thermoplastic which is generally utilized as a part of designing applications. We can state that it is an awesome decision for seals. It is essentially required when the necessities lay outside the temperature scope of PTFE. It is perfectly suited in environments with temperatures between -70 F to 600 F and additionally it can't be influenced effortlessly by constant contact with steam and heated water. It is additionally harder than PTFE.