I need some advice on how to cure a problem I am experiencing with
my injected wax models. I am ending up with what appears to be an
"Orange Peel" effect on my models which I suspect is due to
excessive talc as a release agent. However if I use no talc the
models tend to have a wavy look to the wax which is probably due to
the wax dragging against the rubber. I have tried using a silicon
mold release spray instead of the talc but have not been able to
generate models without the wavy effect. My set up is as follows:
- Using a low temp injection wax (155 degrees F) 2. Using low
pressure to fill the mold (all detail is filled with very little wax
fanning out into the vents which leads me to believe that the
injection pressure is correct). 3. Using an RTV silicon mold rubber.
I dust the mold with the powdered talc (dusting into the vents) and
then blow out as much as I can. After this I usually make two to
three models before dusting again. The first model usually has a lot
of the orange peel effect. The next model has less, and a third
usually starts to drag in the mold.
I would appreciate it greatly if someone could give me some ideas to
try out to eliminate this problem. The orange peel is somewhat
difficult to remove from the wax and very difficult to remove from
the finished castings.
Thanks in advance,