Product Code:SAE AMS3678/4 Title:Type 4 25% Glass Filled Virgin Polytetrafluoroethylene (PTFE) Moldings or Extrusions Issuing Committee:Ams P Polymeric Materials Committee Scope:This specification covers a polytetrafluoroethylene (PTFE) resin filled with 25% glass fiber in the form of extruded or molded rods or tubes which are sintered after molding or, in the case of extrusions, sintered during the extrusion process.