Hello all,
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)
-
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). -
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,
Cheers,
Ralph