BURNOUT - CASTING INSTRUCTIONS

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.

Normal burnout cycle :

Stonecast burnout cycle :

Stonecast burnout

DO NOT exceed 630ÂșC 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. GoodwinRefractory 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