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Steel-based armour, exhibiting plastic deformation as a result of projectile impacts. Plastic deformation as a result of impact can knock loose, tear or squish passive fire protection (PFP) materials, particularly once the PFP materials are stressed.
Some PFP materials can at times be very resilient, impact resistant and ductile at ambient. Once stressed by fire, that can change as free water dissipates at 100°C (212°F), and hydrates can be spent near 300°C (572°F), all of which is reached within minutes of a fire. Construction level binders, unlike certain refractories, can also degrade with heat, thus changing the physical properties of many PFP materials across different temperature ranges. None of that is normally a problem. In fact it is part of PFP designs for different reasons. But when combining PFP with ballistics or fragmentation, it is prudent to consider all relevant stresses in designing barriers that must (or may be presumed or advertised to) simultaneously defeat fire, followed by hose stream and impacts that come during a fire event.
Barriers are typically designed to defeat defined threats.