It is lined with reinforced concrete effectively resistant to corrosion, weathering and cracking.
All of these, like gold, are noble metals, meaning that they are resistant to corrosion.
Adding the ash makes concrete stronger and more resistant to corrosion.
Polyesters are strong, colourfast, and resistant to corrosion and chemical attack but tend to build up a static electric charge.
a hard brittle blue-white multivalent metallic element; resistant to corrosion and tarnishing.