Hardness isn’t the best thing to have in armor. In fact, extreme hardness means extreme brittleness.

Tensile strength is more desirable in armor. That’s the sort of strength that a string or rope, or Kevlar will have.

Those can stretch a bit before breaking.

Kevlar will stretch a bit when catching a bullet, this does a few things, but importantly it slows the bullet before stopping it.

So this new material will likely show extreme tensile strength rather than hardness.