From: Paul Suomala (email@example.com)
Date: Sun Jan 26 2003 - 16:10:46 EET
The "Sanders" green material goes to liquid state at 95 Deg
It is attacked (at room temperature) very rapidly by acetone
(isopropyl alcohol works but is a little slower). If
evacuation must be completed at room temperature, either of
these would remove all the green material with adequate
Autoclaving is an alternative if that is an acceptable
I presume the investment substitute displays unacceptable
behavior at elevated temperatures or Rob would not be so
specific about that requirement.
Rob - does the project HAVE to be made from SLA material?
If so, I should think the material providers know what
destroys their material(s).
James McMurray wrote:
> 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. Regards,James
> ----- 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
> > 919-781-7702
> > firstname.lastname@example.org
> Prof. Stanley Lechtzin
> Temple University
> Tyler School of Art
> 7725 Penrose Ave.
> Elkins Park, PA 19027
> phone: 215-782-2863
> fax: 215-635-2861
> email: email@example.com
> M/J/C-C web site
> Online CAD/CAM I Course
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