Melt Temperature Recommendations For Various Casting Methods
  • Vacuum assist casting: 100° to 200° F over Melt Temperature.
  • Centrifugal/sling casting: 50° to 125° F over Melt Temperature.
  • Pieces with less detail require lower superheats.
  • Experience is the best guide.

Flask Temperature Recommendations For Various Casting Methods

  • Smaller pieces (findings) and pieces with great detail (filigree rings) require higher flask temperatures 1100°F to 1300°F.
  • Large pieces (mens rings) and pieces with few details require a lower flask temperature, 800°F to 1000°F.
  • White gold generally requires flask temperatures on the high end of the recommendations.
  • Centrifugal casting tends to have flask temperatures on the lower end of the recommendations.
  • Large and small pieces on a single tree require flask. temperatures closer to those needed for light pieces.
  • Experience is the best guide.

About The Metal

  • Ratios in excess of 50% scrap are not recommended.
  • Clean metal thoroughly before using (no investment).
  • Purge system periodically. Start fresh every six months.
  • The weight of the metal in the button and tree should at least equal the weight of the pieces cast.

Investing Procedures

Ratios of Investment to Water

  • Follow instructions of the supplier.
  • Pieces with great detail may need a slightly greater amount of water for investment.

Vacuuming Investment

Burnout Cycle

  • Don't move invested trees too early (wait one hour).
  • Follow instructions of investment supplier.
  • Check that temperature read was accurate.
  • The casting flask temperature (final step) should be maintained for at least one hour before the first flask is removed.

Proper Spruing and Gating

  • Improper spruing is the leading cause of shrinkage porosity.
  • Don't use chock gates. They cut off the feed metal.
  • Place sprue (gates) at heaviest cross sections of the piece.
  • Use runners to heavy areas if they are separated by thin cross sections.
  • Flair the gate at the connection to the piece. This will help reduce turbulence in the metal flow.
  • Don't put pieces too close together.
  • Smooth all surfaces to avoid sharp corners which may break off during casting (i.e. connections between main sprue and gates, and gates and piece).


  • Don't rush to break out. Place flask in shaded area, quench when red glow is no longer visible in button.
  • Clean investment off thoroughly if you plan on reusing the scrap. Investment in the melt will cause porosity problems over time.
  • If breaking out dry by hammering, be sure flask is well below 600°F to help reduce potential cracking.

Don't forget about our Investment Casting Checklist:

We also have a video about our casting process. Watch it here.