Abstract
Heat-resistant insulators are the core materials in fire doors and are directly related to people’s safety in a fire. Heverever, there needs to be a material that possesses heat resistance and insulation with reasonable production cost. To develop a core material for fire doors based on recycled paper, such as copy paper and linerboard, were impregnated with liquid sodium silicate and the effects of the sodium silicate content on the thermal properties of paper were investigated. It was observed that liquid soidum silicate can be used as a flame retardant when manufacturing fire door core materials. Imprenation of liquid sodium silicate delayed both glowing and burning temperatures along with an increased weight of residues after combustion over 750℃. Hence, it is possible to manufacture an incombustible material based on recycled papers by adding liquid sodium silicate and inorganic materials that do not themally decompose over 750℃.
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