Those ceramic bits resonate in such a way that angle grinders bounce, deflect, and are unable to cut into it. This clever recipe results in a material that resists cutting from angle grinders and power drills. The whole thing melts together, poofs up like bread, and the ceramic bits are distributed evenly throughout the finished metal matrix. They’re calling it Proteus, and if uncuttability isn’t already cool enough, say that it’s also just 15 percent of the density of steel. How do you make it? You bake a mixture of powdered metal, a foaming agent, and ceramic bits in a furnace.
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