What is the mold constructed of? Aluminum? Cast Iron? It doesn't specify in the description(even on the Lyman site)...

It seems to be made of a heavy cast aluminum alloy. it doesn't seem to be cast iron, because the surface can be scratched with a common "steel" wood screw.

Does lead have to be a certain temperature to make ingots

Not a "certain" temperature, but melted of course. You need to reach at least 625 degrees F for this to occur. Of course you should clean the lead really well before making ingots, so you are not cleaning it later when you pour stuff. Little trick for you. When I got my four molds, I mixed some JB Weld and used it to secure the tang into the handle. This worked really well and keeps everything tight. You don't want the handle coming undone while you are moving the molten lead about.

Material	Aluminium
Colour	Black
Brand	Lyman
Item dimensions L x W x H	12.4 x 4.8 x 4.3 Centimeters
Shape	Round
Number of Pieces	1
Global Trade Identification Number	00011516277947
Manufacturer	Lyman
UPC	011516277947
Department	unisex-adult
Country of Origin	USA
Item model number	2837794
Product Dimensions	12.4 x 4.8 x 4.3 cm; 472 g
ASIN	B001GXHM4W

Lead Ingot Mould

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