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Flashing/ Finning |
Cause | Remedy |
| 1. Excessive water to powder used ratio. | Use correct water / powder ratio(follow the instruction) | |
| 2. flasks are to be left for long time before burning out | Gold and K Gold casting left for 90 minutes, platinum for 60 minutes | |
| 3. burnout heat up too fast, Moving flask too soon before burning out |
Leave flask till times up, and Elevated temperature is using band temperature program |
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| 4. centrifugal casting spin speed is too fast | Torque setting have to match spin speed | |
| 5. Cast powder Imprope storage or expired, mix time no long enough | Casting powder starage and mix can follow the instruction | |
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Porosity/ Gap |
Cause | Remedy |
| 1. Overheating the metal. | Reduce metal casting temperature. | |
| 2. Flasks overheated during burn out. Work time not long enough. | Coll down the temperature of casting, use band temperature program make the full discharge of so2 in the flask, Avoid oxidation | |
| 3. metal Repeat the use of too many times | Impurities in the metal., and ensure it is clean | |
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Bubbles/ Incomplete spheres |
Cause | Remedy |
| 1. Electrostatic charges and/or grease or dirt on waxes. | Use a wax wash, note the wax must be completely dry after washing | |
| 2. Faulty vacuum pump. | Check equipment, chang the oil of vacuum pump | |
| 3. vacuumed too long | follow mixing instructions supplied | |
| 4. Work cycle too long. Investment beginning to set while still under vacuum. | Ensure the work slurry is mixed according to instructions (the best time 12 minutes). | |
| 5. Incorrect water ratio. Too little water. | Use correct water / powder ratio(follow the instruction) | |
| Rough surfaces | Cause | Remedy |
| 1. Flasks rough, Moulds rough | ||
| 2. Overheating the metal. | Reduce metal casting temperature. | |
| 3. Steam de-waxed for too long | Steam de-wax for a maximum of 45 minutes at atmospheric pressure | |
| 4. Heat up too fast, slurry not to solidify before heat. | Leave time must be enough, and follow the instruction | |
| 5. Excessive water to powder used ratio | ||
| Cause | Remedy | |
| 1. Work time not long enough. | Ensure work time is fully used | |
| 2. Too high water content | Use correct water / powder ratio as instruction | |
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Blisters/spalling |
Cause | Remedy |
| 1. burnout speed is too fast |
Using band temperature program Reference manual |
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| 2. divesting too early, Easily broken | Cool dowm about 15-20 minutes | |
| 3. the temperature of the flask is too low. Easily broken | increasing the temperature | |
| 4. There are impurities in the alloy, Easily broken | Purified metal | |
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5. Metals containing oxidizing substances |
Purified metal, using Band temperature program. |
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