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Thread: 'Over Drying' of PC ?

  1. #1
    Join Date
    Aug 2011
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    'Over Drying' of PC ?

    Have you experienced any issues when you have ‘over dried’ PC?

  2. #2
    Join Date
    Aug 2011
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    Upstate of South Carolina
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    Not PC. Now I have had the issue with PA, loss of plasticizers and the parts were brittle and failed the bust test. But not PC. Now I have seen WD-40 wiped on PC parts and they develop stress cracks afterward?!

  3. #3
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    Aug 2011
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    Color shift on a bluish tint that turned grey after too long in the dryer. It was a part that was to be sterilized.
    Funny,we were just talking about this.
    Keep on Molding!

    brent

  4. #4
    Join Date
    Sep 2011
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    1
    Quote Originally Posted by Suhas View Post
    Have you experienced any issues when you have ‘over dried’ PC?
    We keep our dryers running at 250 degs for PC and I have never seen a problem related with over drying. What would I expect to see? Burning? Brittleness?

  5. #5
    Join Date
    Aug 2011
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    @Clessard, Thanks for your post. Honestly, I am not sure. I did some research on overdrying of PBT and Nylons and got some interesting results. It is usually the additives that degrade and leave the system and then that particular property related to the additive is lost. For example, in PBT it was an impact modifier (almost certain) that was lost and so the parts ended up being brittle. So with PC, I am not sure. Brent (above) had some insight.
    Hope this helps.
    Suhas

  6. #6

    Re: 'Over Drying' of PC ?

    No u will notice when it stops pulling and have 2 cut the hopper in half not usually an issue

  7. #7

    Re: 'Over Drying' of PC ?

    Only when u have 2 cut you're hopper apart and throw it away

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