Hardware Performance and Closure System Requirements
topic
Firefighting clothing hardware including zippers, snap fasteners, hook-and-loop closure, and buckles must demonstrate functionality after thermal conditioning at 260 degrees Celsius per NFPA 1971 and retain closure force and operation through fire-scene temperature exposures, with all hardware materials required to be non-melting and non-dripping, metal components specified where polymer alternatives would fail thermally, and zipper slider retention specified to prevent accidental opening under physical stress.
Role
Ensures that closure systems and hardware maintain functionality after thermal exposure that would degrade or melt non-FR hardware, preventing the loss of garment closure that would eliminate thermal protection at the zipper interface and ensuring that fastener systems remain operable for donning and doffing even after exposure to the elevated temperatures of structural firefighting operations.