Lastly, the galvannealed coating makes the steel door easier to weld to, making it easier for reinforcements or accessories requiring welding of the steel door. Also, the coating is dense making the steel door more resistant to abrasions such as dings or dents. The benefits of the galvannealed coating allows paint to adhere to the metal door's surface without of any kind of paint pretreatment. Galvannealed hollow metal doors are sought after since the hot dipping zinc heat process the steel sheets are exposed to creates entirely new layer of zinc iron alloy. The proper standards for zinc coating hollow metal doors are the ASTM A 924 / A 924M and ASTM A 653 / A 653M, set forth by Steel Door Institute. These hollow metal doors are known as galvanized or galvannealed hollow metal doors.
The steel sheets of higher quality hollow metal doors are zinc coated by a hot dipping process. Each core provides different benefits and are used in specific applications. While other core types include honeycomb, polyurethane or a steel stiffened core. The most common core type is a polystyrene core. Within the steel sheets that make up the outer shell of the hollow metal door, is an insulated core. The most common misconception is that hollow metal doors are not insulated and are nothing but a metal shell of a door. The typical door thickness of a commercial hollow metal door is 1-3/4". Other lighter duty hollow metal doors are constructed from thinner 20 gauge steel sheets, while extreme heavy duty hollow metal doors are designed with thicker 16 gauge steel sheets. The door construction is typically made from heavy duty 18 gauge steel sheets designed for industrial and heavy traffic use. Commercial Hollow Metal DoorsA hollow metal door is a type of commercial steel door.
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