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PTFE and FEP coatings

  • 1.  PTFE and FEP coatings

    Posted 11-23-2018 15:06
    ​​Hello,
    I am trying to determine the lifespan of some FEP and PTFE coatings. I don't have time to run through cycle testing. Does anyone of any suggestions of vendors or knowledge of testing methodologies?

    Also has anyone ever used PVA coatings on Silicon resin systems? What has been your result.

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    Matthew Kelly
    Materials and Process Engineer
    Peraton-Acusil Division
    Colorado Springs CO

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    Matthew Kelly
    Materials and Process Engineer
    Peraton-Acusil Division
    Colorado Springs CO
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  • 2.  RE: PTFE and FEP coatings

    Posted 11-26-2018 12:03
    Can you tell us the environment your parts will be seeing?

    JK





  • 3.  RE: PTFE and FEP coatings

    Posted 11-26-2018 14:36
    Sure. The PTFE and FEP coatings are mostly used as mold releases.
     Material: Low Carbon Steels (1018/1020) and mid-grade aluminum.
     Environments: Sylgard resin system with a quartz fiber. Parts are vacuum bagged and  baked at 240F for up to 24 hours. After cleaning with reagent grade Acetone or isopropyl. Cleaning with sterile wipes - wetted wipes.
     

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    Matthew Kelly
    [JobTitle]
    Peraton-Acusil Division
    Colorado Springs CO
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  • 4.  RE: PTFE and FEP coatings

    Posted 11-27-2018 15:34
    Hello
    The cure temperature for fusing PTFE and FEP(neat) are above the anneal temperature for Aluminum.  That means that there will be no structural strength in the aluminum after curing.  There are compounds, such as  TFE Polyimide coatings that are primarily used for low friction that will cure below 400F.

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    [Stan] [Peters] [PE}
    Consultant
    [Process Research
    [Mountain View [CA]
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  • 5.  RE: PTFE and FEP coatings

    Posted 11-28-2018 17:55

    Thank you for your help. That does help me understand why certain plastic deformations have been seen on one of our aluminum molds. I really do appreciate your response. I found out from our coater that a (temps refering to metal temps.) a 750F heat treatment is held for 1 hour followed by a 25 minute cure time at 650F.

    Clearly grain growth and recrystallization has began but not to a full anneal. Thank you for suggesting an alternative coating. I can keep that in mind for a possible criterion for a new coating system. 



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    Matthew Kelly
    [JobTitle]
    Peraton-Acusil Division
    Colorado Springs CO
    ------------------------------