Chris,
If you are pulling a Vac during the making of the mold this cause problems. We had problems with 5220 and could only assess that the vacuum was causing some sort of outgassing on the pattern.
We determined that by post curing in an oven and then by sealing with a barrier coat (Primer/Sealer) we were able to minimize the inhibition. An additional step we decided to add was to airbrush straight catalyst on the surface of the part (let set for a couple of hours) to neutralize the inhibitor and then mold.
Hope this helps,
Carl Dekker
"MAKING TOMORROW TODAY"
Rapid Prototyping Services
MET-L-FLO Inc.
www.MET-L-FLO.com
sales@met-l-flo.com
1(800)MET-L-FLO (638-5356)
P.S. Have you considered changing resin?
----- Original Message -----
From: Chris Sutcliffe
To: rpml
Sent: Wednesday, September 15, 1999 8:13 AM
Subject: Preparation of SL5220 models for vac casting
Dear all
I've been having a lot of trouble with vac casting from SL5220 models. No matter how clean the models are they still seem to poison the silicone. Does anyone have any hints/tips for post processing 5220 models for vac casting.
Thanks in advance
Chris
Dr. Chris. Sutcliffe
Rapid Prototyping and Micromanufacture Research
Product Innovation and Development Centre
Department of Engineering
3 Brownlow St.
Liverpool L69 3GL
(0151) 794 8022 Direct
(0151) 794 8021 Secretary
01893 209 556 Bleeper
EMail c.j.sutcliffe@liv.ac.uk
For more information about the rp-ml, see http://ltk.hut.fi/rp-ml/
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