When do you use block verses ceramic shell investment casting (PLA)?

Discussion in 'Lost PLA casting' started by Rotarysmp, May 11, 2020.

  1. Rotarysmp

    Rotarysmp Silver

    Since I need to have another shot at casting John Lennon, I was wondering about the difference between block and ceramic shell?

    Is it a size thing? Jewellery up to about xx (length, weight?) block, everything above shell?

    Is it more driven by the number to be produced? Make one block, make 1000 ceramic shell?
  2. Jason

    Jason Gold

    You are only limited by the size of your flask and the size of your wallet buying investment. Do your plastic toy in solid investment, you'll have better luck. You can cook that shit for 3 weeks to get all that pla out if ya want. After you cook it, cool it back down slowly and flush it out with water. Dry it and try again.
  3. rocco

    rocco Silver

    You can get it wet after cooking it??? That doesn't sound right, it would work with ceramic shell but block type investment is usually gypsum based and with anything gypsum based, if you get it wet after baking, it turns to mush.
    Last edited: May 12, 2020
  4. Jason

    Jason Gold

    That's right rocco. Brain farted. Well, he can cook the piss outta it and then give it a blow job.
  5. DavidF

    DavidF Administrator Staff Member Banner Member

    It's what is required for a casting that dictates the process....

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