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For a unit to meet the U.L. class B build standard to be regarded by them as a (true) safe, all six sides of the unit must be at minimum, .250" plate steel. It would appear that only one of the choices you've listed above meets that requirement. I am not an engineer, but I've been told that .250" plate is not twice as tough as .125", it's well over that. I also realize that "tough" is not a scientific term, but what's important is the ability to withstand an attempted forced entry through the steel. Thicker is better. Furthermore, any of the laminate examples you listed do not qualify as a true safe because the quarter-inch minimum is for integral plate, in other words, solid steel. Therefore, your example #2 is the winner in my book.
900F
For a unit to meet the U.L. class B build standard to be regarded by them as a (true) safe, all six sides of the unit must be at minimum, .250" plate steel. It would appear that only one of the choices you've listed above meets that requirement. I am not an engineer, but I've been told that .250" plate is not twice as tough as .125", it's well over that. I also realize that "tough" is not a scientific term, but what's important is the ability to withstand an attempted forced entry through the steel. Thicker is better. Furthermore, any of the laminate examples you listed do not qualify as a true safe because the quarter-inch minimum is for integral plate, in other words, solid steel. Therefore, your example #2 is the winner in my book.
900F
