Testing fire resistance: alabaster, putty, sand, cement

I tested fire resistance of some materials such as putty, alabaster (plaster), sand, cement. The purpose is to determine the best refractory for my new smelting furnace project. I decided to try different proportions of widespread materials which could be a good refractory for the walls of metal melting furnace.

You can watch the whole process in the video above or read step by step instruction on this link on instructables.com: Testing fire resistance: alabaster, putty, sand, cement 

Unexpected results during fire resistance test (part 2)

That’s the second part of refractories test. After that test I will choose the best material for my new metal melting furnace project.
This particular experiment consist of 2 smaller tests:
During the first test, I made such mixtures:
1. Fire clay – 100%;
2. Fire clay – 40%; Grog – 40%; Graphite dust – 20%
3. Fire clay – 40%; Grog – 50%; Graphite dust – 10%
4. Fire clay 40%; Grog – 50%; Graphite dust – 5%; Mineral wool – 5%
5. Fire clay – 40% Grog – 40%; Graphite dust – 10%; Alabaster – 10%
6. Alabaster – 50%; Sand – 50%;
7. Cement – 50%; Sand – 50%

You can watch the whole process in the video above or read step by step instruction on this link on instructables.com: Unexpected results during fire resistance test (part 2)