What does fire resistance mean?

Definition and usage of Fire Resistant vs. Fire Proof

Fire resistant materials are designed to prevent the spread of fire and withstand heat. When a source of ignition is removed, fire resistant material like NEXGEN MgO boards self-extinguish.  Note that fire resistant and fire proof are used to describe the same behavior. However, fire resistant is a behaviour and can be tested and characterized.  Fire proof is an an absolute statement which is often misused as everything burns at a high enough temperature -  NEXGEN does not use the term fire proof.