The drawbacks of general plastic hollow board products are their flammability and the production of smoke or harmful gases when burning. To assess the combustion properties of plastic products, the oxygen index is used. The higher the oxygen index, the more oxygen is required to sustain balanced combustion, making the material more difficult to burn. The oxygen index of hollow board material polypropylene is 17.5. Therefore, to convert general hollow boards into fire-retardant hollow boards, it is necessary to increase the oxygen index by adding fire retardants to meet higher fire safety requirements.

Fire-retardant honeycomb panels are flame-resistant due to the addition of fire retardants. These fire retardants are the application of fire retardant technology in everyday life, a special chemical additive used to improve the combustion properties of flammable and easily ignitable materials, widely used in the flame-retardant processing of various packaging materials. After being processed with fire retardants, the honeycomb panels can effectively prevent, delay, or stop the spread of flames upon contact with external fire sources, thereby achieving fire-retardant properties.