Hardcoat/PTFE Anodizing is a special application of a controlled oxide film on aluminum with the inclusion of polytetrafluoroethylene (PTFE) molecules. The resultant coating offers the dense, hard protection of Type III hardcoat anodizing coupled with the excellent dry lubrication for which PTFE is so well known. Hardcoat/PTFE Anodizing provides a very good surface for aluminum molds, as the lubricity of the surface translates into superior release characteristics, and the coating remains stable at high temperatures. Additionally, the mechanical synergy between the crystalline formation of the oxide film and the molecular structure of the PTFE yields very good wear characteristics. The coefficient of friction of the Hardcoat/PTFE Anodizing is 50% lower than that of hard anodizing alone. Hardcoat/PTFE Anodizing is highly resistant to atmospheric and marine corrosion and serves as an electrically insulating coating.
Note: Chem Processing's Hardcoat/PTFE anodize conforms to MIL-A-63576 Type I. To better understand the properties of this coating versus other Types please reference this specification (available as a free download here). The PTFE fills surface asperities and penetrates into the pores of the freshly anodized film, but is not a codeposit in the manner of electroless nickel/PTFE. Engineers should account for reduced available PTFE as the film is removed in high wear applications.