Processing Capabilities

Cook Compression performs all compression and melt molding processes in-house. These processes are closely monitored to ensure the quality and consistency of finished products.

Cook maintains an extensive inventory of tooling and also manufactures custom tooling to meet your requirements.

  • Large-diameter PTFE, UHMWPE, PEEK®, PFA, PPS and P-84® (HCM) Polyimide shapes
  • Heavy cross-section molding
  • Unfilled (virgin) and filled PTFE rod and tube
  • Modified PTFE molding and welding

PTFE Compression Molding

Compression molding is the primary process used for producing basic shapes out of PTFE. The PTFE powder is placed in a mold and subjected to a pressing operation to produce a “green” pre-form. This pre-form is then fired in an oven through a process called “sintering” to produce a cured or mechanically bonded polymer.

Cylinder molding capabilities:

  • 1 to 45 inch (25 to 1,143 mm) lengths
  • 3 to 9 inch (76 to 229 mm) OD

Compression Melt Molding

Melt molding is similar to compression molding, but applies only to melt-processable thermoplastics, like PEEK. The thermoplastic powder is placed in a mold, which is put into an oven to reach or exceed the melting temperature. Once the material has melted, it is placed under a constant pressure until it cools. During this procedure, the polymer chains will cross-link to create a chemically bonded, homogenous material.

Cylinder molding capabilities:

  • 1 to 45 inch (25 to 1,143 mm) lengths
  • 3 to 8 inch (76 to 203) OD

Unfilled (Virgin) PTFE

Our Class 10,000 clean room provides a contaminant-free environment for blending and processing unfilled PTFE and glass-fiber-filled PTFE.