"resistant to fire" is a correct and usable phrase in written English.
You can use it to signify that something is designed to not be damaged or destroyed by heat or flames. For example: "The building was constructed using materials that are resistant to fire, to ensure the safety of its occupants."
Management practices include the use of a few size-controlling rootstocks that are resistant to fire blight and chemical treatments to enhance host resistance [ 26].
Wood can be made resistant to fire with chemical retardants.
Fabrics and other interior materials must be resistant to fire.
These plants are more resistant to fire and grazing than their native counterparts, so they can compete with cheatgrass.
Large-scale insect outbreaks can weaken or kill trees over vast areas, thus creating an environment less resistant to fire.
Being built from iron beams and cement, it was resistant to fire; it also incorporated that highly novel feature, an elevator.
Endemic plant species are resistant to fires and specialized for post-fire conditions generated by frequent lightning fires, primarily within a distinct fire season.
Fibers of different kinds in various proportions are added to the concrete in order to improve its mechanical properties and make it resistant to fires.
Ray Rasker of Headwaters Economics, an expert on wildfires and the built environment in California, said buildings in high-risk areas could be made more resistant to fires in future, often through relatively simple measures.
Normally, after an excitatory neuron fires it becomes more resistant to firing for a period of time.
Hardening involves taking such steps as encasing steel columns close to the ground in concrete, to make them more resistant to blast and fire, and designing in diagonal beams amid the vertical and horizontal structure to transfer loads if part of a building is damaged.
