Given careful design and the right choice of resins, additives and fillers, FRP composites can be used to make structures with better fire resistance than almost any other material. As an example, phenolics are used within firewalls. FRP composites generally are poor thermal conductors, so they do not help the heat of a fire to spread in the way that can occur with metals. The smoke from fire can be a concern, and so careful choices need to be made for internal applications.

As with all issues in design there is always a compromise to be struck between the different material properties needed for a project. If fire resistance is absolutely critical then FRP composites can often be the most cost-effective solution.