How does a fireproof cabinet protect documents during a fire?

Fireproof cabinets protect contents through a combination of thick insulating walls and an intumescent or endothermic material (typically a gypsum-based or vermiculite compound) sandwiched between inner and outer steel walls. During a fire, this insulating layer absorbs heat and releases moisture, keeping the interior below the critical temperature (350°F for paper) for the rated duration. The drawer seals also expand when exposed to heat, preventing flames and hot gases from entering. OfficeFurniture2go.com — call 1-800-460-0858.