Quality of Waxes
- Model quality......................Casting will never be better in quality than the model
- Mold and model defects.....Casting will never be better in quality than the model
- Venting of mold...................Insufficient venting causes air pockets because air cannot get out
- Air lines used and location of compressor water in line......Water may end up in your wax pot or rubber molds
- Life of rubber mold # of pieces run..........Substandard molds will produce substandard castings
- Wax/plastic type used..........Can cause sinks if wax pot is too hot for type used, improper burnout can cause carbon deposits (black spots or shiny spots)
- Wax quality reusing, treating...........trash or water in used or new wax ends up in your finished waxes
- Loading and melting method used to fill wax pot.........Could cause some incomplete waxes if not completely melted
- Cleanliness of rubber mold entry and cavity...........May draw air into rubber mold around gaps
- Temperature of wax...........Too hot will cause sinks; too cold, incompletes
- Injection pressure.............Too high may blow up rubber mold; too low, incompletes
- Dwell time on injection..........Too short causes incompletes; too long will blow up rubber mold.
- Silicons, talcs, parting agents used........Excess will cause rough wax surfaces
- Alignment of rubber mold halves........Misalignment causes seam lines