SRS - Technical Centre: Helpful Hints

Wax Patterns

1. Air lines to the wax pot should have air filters and a moisture trap installed before the pot. This will prevent foreign bodies and moisture entering the wax.

2. Set temperature on the wax pot to the manufacturers recommendations.

3. Store wax in a sealed container to prevent contamination with dust, investment powder, polishing compound and moisture.

4. Check wax pots for signs of contamination and air bubbles when refilling with wax. Periodically clean the wax pot.

5. Bubbles in the wax patterns can be caused by moisture in the air lines, moisture in the wax, overheating the wax or a low wax level in the wax pot.

BUBBLES IN WAX

6. Incomplete wax patterns can be caused by wax temperature being too low, injection pressure too low, injection dwell time too short or lack of vents within the mould.

INCOMPLETE PATTERN

7. Overfilled wax patterns can be caused by wax temperature being too high, injection dwell time too long, or lack of vents within the mould.

OVERFILLED PATTERN

8. Shrinks, mould adhesion, long cooling time and wax running out of the sprue are all caused by the wax being too hot.

9. Distorted wax patterns or loss of definition are caused by opening the mould too soon.

DISTORTED PATTERN

10. Rough wax patterns can be caused by excess talc or release agents on the mould.

ROUGH PATTERN

11. Damaged waxes can be caused by cleaning any flash off with a knife.

View other helpful hints online or download (Acrobat Reader PDF) versions by selecting relevant links below:

HELPFUL HINTS

	Casting		Download PDF (92k)
	Dewax/Firing - Firing Cycles		Download PDF (148k)
	Investing		Download PDF (112k)
	Modelmaking		Download PDF (56k)
	Proportioning Charts		Download PDF (204k)
	Sprueing		Download PDF (204k)
	Wax Patterns		Download PDF (124k)