There are no tricks in testing the durability, the base that best holds its resistance against everyday use will be the durability test winner. Here are some statistics that I got from matweb, from what you can see the stainless steel appears to be the strongest metal in all aspects and copper the weakest …
statics from matweb:
AISI Type 303 Stainless Steel, cold drawn
- Hardness, Rockwell B = 96
- Tensile Strength, Yield = 60.2 ksi
High Leaded Naval Brass, C48500
- Hardness, Rockwell B = 82
- Tensile Strength, Yield = 53 ksi
Aluminum 6061-T6/651 (aircraft grade)
- Hardness, Rockwell B = 60
- Tensile Strength, Yield = 40 ksi
Copper, cold drawn
- Hardness, Rockwell B = 37
- Tensile Strength, Yield = 48.4 ksi
I’ve been using the bases for over 3 weeks now, I am always very careful using my tampers, avoiding heavy knocks. I don’t tap the sides anymore, just a light tamp and a quick polish. Still some of the bases have started to develop scratches and dents.
As expected from the statistics above stainless steel has less dents and scratches on it where the other metals have started to develop minor scratches and dents. The copper is very soft and has a solid knick on the edge already.
Once again stainless steel is coming up on top above other metals. So if you want a metal to last you a long time and remain its shiny finish, the choice is easy.