Refractory Made From Stuff Bought From a Hardware Store

This is a preview of a high temperature refractory that I've been messing around with. It holds up to high temperatures perfectly fine and has decent thermal insulation properties. I have been working on this because I am interested in a durable insulating refractory for use in a furnace.
I'll post a follow up video on how I make it.
For anyone curious, the ingredients are triple phosphate fertilizer, slaked lime and perlite. There are some tricks to getting a solid brick from this which I will describe in the follow up.
#blacksmith #knifemaking #materials