Preforms are used with Provel thermoformers to make thermoplastic sockets.  We offer clear preforms for check sockets and copolymer preforms for definitive sockets in 18 and 25 cm sizes. Provel preforms are molded of high performance polymers using state of the art process controls to provide superior mechanical properties and consistent forming. 

Check Sockets

  • Impact Modified SBC
  • CK18, 18 cm, clear 
  • CK25, 25 cm, clear 


Definitive Sockets

  • High Impact Polypropylene Copolymer
  • CP18N, 18 cm, natural 
  • CP25N, 25 cm, natural



Preforms Product Sheet


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