Troble Shooting

Investment Crack

Problem / Question
The investment ring has cracks after burn-out

Cause (1)
The ring has been left too long after investing.
Solution / Answer (1)
If the ring has been left for more than 12hours after investing, soak the ring in the water for 3-5 minutes, and then place it in the preheated furnace at 850°C(1562°F)
Cause (2)
The mixing ratio of powder and liquid is wrong.
Solution / Answer (2)
Observe the specified ratio (24ml/100g).
Cause (3)
Too much Vaseline has been applied to the ring, pedestal base and leveling cap.
Solution / Answer (3)
Use of Dry Teflon®-Silicone spray is recommended.
Do not apply too much Vaseline more than is needed. Wipe extra Vaseline off with tissue paper.
Cause (4)
The specified press investment liquid has not been used.
Solution / Answer (4)
Use the specified liquid.
Cause (5)
Removing the investment ring from the ring former , pedestal base and leveling cap is too early.
Solution / Answer (5)
Remove the investment ring after the specified time lapse.
Cause (6)
Mixing of the powder and liquid is not sufficient.
Solution / Answer (6)
Mix the powder and liquid for one minute with a vacuum mixer.


Problem / Question
The investment ring has cracks after pressing.

Cause (1)
The plunger has not been inserted vertically.
Solution / Answer (1)
Ensure that the plunger is inserted vertically.
Cause (2)
The wax patterns have not been positioned properly in the ring.
Solution / Answer (2)
Secure the distance of at least 8 mm between the wax pattern and the ring inner wall, and the distance of at least 10mm from the ring top to the top of the wax pattern.
Cause (3)
The specified Noritake press investment has not been used, or water with liquid was used for mixing with Noritake press investment.
Solution / Answer (3)
Be sure to use Noritake press investment. Never use water for mixing. Be sure to use liquid only for mixing.
Cause (4)
Press time is too long.
Solution / Answer (4)
Observe the specified press time.
Cause (5)
The investment ring has been left too long after taken out from the burn-out furnace.
Solution / Answer (5)
After taking out the investment ring from the ring furnace, set the ring quickly to the press furnace.
Cause (6)
The top surface of the investment ring is not flat, or the top and the side of ring is not at 90 degrees angle.
Solution / Answer (6)
Ensure that the top surface is flat and the angle of top and the side of the ring is at 90 degrees.
Cause (7)
The investment ring has not been properly set in the press furnace.
Solution / Answer (7)
Place the investment vertically to the press furnace table and in the right position.