SpectraSeals® are engineered plastic seals incorporating a metallic spring, which loads the seal lips against the mating hardware, creating a seal. The spring also allows the seal to follow minor eccentricity and compensate for seal lip wear in dynamic applications. SpectraSeals® are normally used in single acting applications and should be oriented with the spring cavity toward the pressure side. The seal jacket is produced from a filled or virgin PTFE material or other plastic materials such as PEEK, UHMW-PE, Acetal or Nylon.
SKF Polyseal explains their seal as follows:
“SpectraSeals® are engineered plastic seals for extreme conditions where conventional elastomeric seals can't be used. Used in corrosive media, extreme temperatures and high surface speeds. Seals incorporate a metallic spring, which loads the seal lips against the mating hardware, creating a seal.”