What type of insulation is used inside fireproof filing cabinets?

Fireproof filing cabinet insulation typically consists of a poured concrete or composite insulating material between the inner and outer steel walls of the cabinet. During a fire, this material absorbs heat and can release moisture as steam, which helps maintain a cooler internal temperature. Some manufacturers use a proprietary mix of minerals and fire-retardant materials rather than traditional concrete. The insulation makes fireproof cabinets dramatically heavier than standard filing cabinets — the thick insulating walls account for most of the weight difference. The quality and thickness of the insulation directly determines the fire rating the cabinet can achieve. FindOfficeFurniture.com — call 888-719-4960 for specific insulation details on available models.