The Heavy Armor Block is a block in Space Engineers.
Armor is the primary structural component of most ships and stations, providing a framework to which other blocks can be attached. Additionally, as its name would suggest, armor provides protection from all variety of environmental dangers, impacts and attacks from hostile players.
All types of armor are composed entirely of Steel Plates and, by extension, consist entirely of iron. Some of the plates used in the construction of armor are optional, but even at 1% completion armor will provide structural support for other blocks. The benefit of completing their construction is simply to improve their durability.
Heavy armor provides better protection than light armor, but also has more mass and requires more materials to build. Light armor is painted in solid colors, whereas heavy armor is painted in camouflage patterns.