![](/images/flag/s/en.gif)
1. After the wax has been removed you may load the furnace SPRUE HOLE UP or use our WWT13 or WWT18 Grate & Tray and the sprue holes can remain down. REMOVE WAX TRAY AT END OF FIRST HOUR. To start this program, see instructions below. The program begins with a slowly rising temperature from ambient to 1350 ° °°°°F (730 ° °°°°C) which requires approximately 8. hours. The program then holds that temperature for 2 hours, and then reduces to a casting temperature of 900 ° °°°°F (480 ° °°°°C) and hold