Re: Dissolving SL Resin?

From: James McMurray (
Date: Sat Jan 25 2003 - 10:14:47 EET

Rob, Even though the Sanders support wax will dissolve at 60 deg. C in BioAct the build material needs a much higher temp. and then it doesn't really dissolve it melts into a floating goo that sticks to itself and any strainers in the bath. I would talk to the Solid-Scape folks and find out what it will dissolve in, and at what temperature. Chances are it will dissolve in an easy to obtain solvent. Then the problem becomes does the solvent breakdown the mold material.
You might try to see if the customer can allow steam dewaxing. That might clean out the mold well enough and not ruin it for his purposes.

  ----- Original Message -----
  From: Stanley Lechtzin
  To: Rob Connelly
  Cc: RP-ML
  Sent: Friday, January 24, 2003 8:36 PM
  Subject: Re: Dissolving SL Resin?

  Hi Rob -

  How about using the Sanders process? The support wax used in this process will dissolve at approx. 60 deg. C. using BioAct as a solvent.

  - Stanley

  At 08:48 PM 1/23/2003 -0500, Rob Connelly wrote:

    Hello RP'ers,
    I have a resin question for the group. I have a customer who wants to make some tiny little parts on a high-res SL machine for a medical application. Trouble is, he needs the parts for a process similar to investment casting wherein he will shell them with something, and then dissolve the SL part back out of the shell. He can't use high temperatures as in investment casting -- he needs to use a solvent.
    So, is anyone aware of a resin that can be used in a high-res SL machine (either a Viper or a 250HR) that can dissolve in acetone, xylene, MEK, or other such nasty chemical? Do the old acrylates dissolve? My customer has told me that just softening or deteriorating is not good enough -- it has to dissolve. If this does exist, do you know of a vendor who has this combination to whom I can outsource the job?
    Thanks in advance for your time,
    Rob Connelly
    FineLine Prototyping, Inc.
    6300 Limousine DR
    Suite 130
    Raleigh, NC 27613

  Prof. Stanley Lechtzin
  Temple University
  Tyler School of Art
  7725 Penrose Ave.
  Elkins Park, PA 19027

  phone: 215-782-2863
  fax: 215-635-2861

  M/J/C-C web site
  Online CAD/CAM I Course

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