Do not load flasks into a hot furnace.
Always follow the recommended burnout cycle and never place flasks closer than 15mm to the elements.
Always ensure you do not over or under load your furnace, as this will affect the burnout cycle.
Stonecast burnout
DO NOT exceed 630ºC at any stage of the burnout cycle if casting stone-in-place
Follow the recommended firing cycles keeping in mind the size of can, amount of cans in the oven and the type of oven being used.
Decreasing the length of your burnout cycle will increase throughput, but may produce a lower standard of surface finish or, in some cases, lead to mild flashing. Ensure the flask holds at casting temperature for a minimum of 1 hour before casting. This is to ensure the core temperature of the flask is at the same temperature as the read-out of the furnace.
For casting, SRS recommends using Indutherm GmbH casting machines. Goodwin Refractory Services Ltd are the official UK distributors of this brand of machine and use them for their own in house trials and R&D.
| Recommended Investment Powder Flask and Metal Casting Temperature | |||
|---|---|---|---|
| Metal | Metal Pouring Temperature (°C) | Flask Temperature (°C) | Metal to Wax Ratio |
| Aluminium | 680 - 750 | 220 - 450 | 2.5:1 |
| Brass | 1020 - 1120 | 500 - 700 | 9:1 |
| Silver 925 | 950 - 1050 | 450 - 65 | 10:1 |
| 9k Yellow Gold | 940 - 1040 | 500 - 600 | 11:1 |
| 12k Yellow Gold | 950 - 1050 | 500 - 600 | 12:1 |
| 14k Yellow Gold | 900 - 1000 | 500 - 600 | 14:1 |
| 22k Yellow Gold | 1040 - 1140 | 600 - 700 | 18:1 |
| 9k White Gold (Pd) | 970 - 1070 | 580 - 680 | 12:1 |
| 14k White Gold (Pd) | 1050 - 1170 | 600 - 700 | 14:1 |
| 18k White Gold (Pd) | 1100 - 1250 | 600 - 740 | 16:1 |
| Platinum (95%) | 1900 - 2000 | 750 - 900 | 21:1 |
| Stainless Steel | 1625 - 1675 | 750 - 900 | 10:1 |
| Palladium | 1550 - 1600 | 750 - 900 | 12:1 |