Straight from the Marvel movies...
Masonry protects you & your building
ProtectiFlex has revolutionized the art of masonry! This innovative building material has been tested for blast, ballistic, and weapons threats globally and have earned several extreme loading accreditations. The blocks have achieved a 2-hour fire rating with a minimum thickness of 4 inches. They are suitable for retrofit of existing structures or introduced as a key part of new construction to mitigate against intentional attacks, accidents and natural disasters and implemented in a wide variety of sectors. Pretty Cool!