[frm88]

This sounded interesting, so I went and read a few articles. It seems, dies come in 5 categories: bronze, brass, steel, teflon coated (various bases) and plastic [0].

The bronze (and even brass) are uncoated and don't seem to lose material, on the contrary, they seem to get a patina with use. From what I read, bronze pasta is extruded at lower speed and temperature to account for the material (and the desired texture of the pasta). From an engineering point of view, this article give more insight [1].

[0] https://flavor365.com/pasta-die-materials-the-ultimate-guide...

[1] https://pastasty.com/the-engineering-of-extrusion-how-bronze...