Insulated Fireproof Filing Cabinet

What is the white dust on my FireKing fireproof file cabinet?

Insulated Fireproof Filing Cabinet

Public Service Announcement from http://www.safefile.com The white dust on a FireKing fireproof filing cabinet occurs when the gypsum insulation settles during shipping or over time when the paper documents rub the inside of the file cabinet drawer. This is non toxic and it is not asbestos

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