A professional who charges cupola furnace with slag, basalt, lime, and silica to produce mineral wool. Respnsibilities include:

• Weighs and measures portions of coke, slag, basalt, lime, and silica according to formula specified in orders from cupola operator, insulation.
• Charges materials into furnace in alternate layers.
• May use tractor equipped with scoop to move raw materials to storage and conveyors to feed materials to furnace.