A mixture curable to provide an intumescent coating material. The mixture comprises a silane-terminated polymer, a cross-linker for curing the silane-terminated polymer, an epoxy resin, a cross-linker for curing the epoxy resin, and an intumescent package.

A protective structure for protecting a battery enclosure. The protective structure comprises a functional layer and a reinforcing layer. The functional layer comprises a fire retardant and a refractory material or an intumescent additive.