What Is The Principle Behind The Double-sided Flame Retardancy Of The Fireproof Storage Box?

A fireproof storage box is not merely the result of a simple coating or film application. True double-sided fire protection is achieved by treating both the interior and exterior surfaces with a composite process using national-standard B1-grade flame-retardant materials; upon exposure to fire, the surface carbonizes to form a thermal insulation layer that delays heat penetration. Waterproofing relies on a high-density PP and aluminum foil vacuum-laminated structure that prevents water molecules from permeating the micropores, keeping the interior dry even after 24 hours of immersion.

Moisture resistance is further enhanced by internal moisture-absorbing particles, which maintain the humidity within the sealed space at a stable level below 45% RH-the ideal range for the long-term preservation of paper documents such as household registers, property deeds, and birth certificates. While ordinary paper boxes are prone to yellowing and becoming brittle due to moisture-and suffer from ink bleeding and blurred text in high heat-this type of professional storage box maintains its structural integrity under continuous load at temperatures up to 65°C, successfully withstanding the challenges of both the humid "Return of the South" season in the south and the heating season in the north.