Hi, I casted directly UV curable acrylic plastic made by 3D printer
to 750 gold but as a result they have a lot of porosity like a
cheese and also got many cracking.
I have many experience about centrifugal casting and vacuum casting
by casting wax but I have never seen such so many porosity at
I would like to ask how I can prevent this terrible porosity on
acrylic plastic next time.
What I did, UV curable acrylic plastic ring size US16 0.06inch/1.5mm
thickness arm ring. I took mold in plaster.
Stainless ring size is 2.9921inch/7.6cm diameter, 3.937inch/10cm
height 0.0787inch/2mm thickness
electric kiln setting in turns,
1. 550C/1022F Hold 1hour
2. 675C/1247F Hold 30mins
3. 775C/1427F Hold 10mins
4. 680C/1256F Hold 90mins
5. I took the plaster mold out from kiln and stayed at room 5 mins to
cooled it down in room temperature 28C/82.4F.
I used oxygen torch with propane gas for melting 750 gold and my
casting machine is Romanoff Deluxe Roma-Vac Tabletop System 110V
UV curable acrylic plastic heat Softening temperature is Celsius 80
Was this problem cause of gas porosity by UV curable acrylic plastic
of did I too much heat up plaster mold? I put a pinch of borax into
gold when I melt it to prevent gas inclusion.
I m thinking I should take silicon mold from acrylic plastic and
convert it to injection wax next time...