A sheet of aluminum Stainless Stell plate when can even be obtained at a cheap price at the building store.
Aluminum is a poor choice. As far as metals go, it has very low strength and durability, it is highly malleable, it has a melting point well below temperatures reached in an average house fire, and it is very prone to corrosion. It offers very little over just using paper.You can easily pick up stainless steel at a hardware store. Use this instead.
I have discussed about good materials to use as seed storage. And the choice that I think is good and resistant to rust and can withstand extreme temperatures is Stainless Stell 304 which is a type of Austenitic Made from several ingredients such as 16% Chromium and 7% Nickel and Nitrogen, which will make it have strength and resistance at high temperatures or low temperatures and resistant to corrosion.
There are several types of stainless steel with different resistance
