Turcite B is PTFE (polytetrafluoroethylene), which is a thermoplastic resin used in industrial applications that require reduction of friction on bearings and moving parts. 
This is original Turcite manufactured by Trelleborg Sealing Solutions.
     Manufactured in sheets
     Resistant to chemical corrosion & is self-lubricating
     Increases accuracy
    Reduces damage caused by mechanical breakdowns & lubrication failures
    Extends life of mechanical components
    Saves energy
    Improves stick slip performance
    Some people say and lubrication gib material as Turkite or Terkite.
    Box way and gib repair