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Ferro-Fibrous armor (FF) is a special type of armor used by vehicles and BattleMechs. Utilizing a weave of ferro-steel, ferro-titanium, and diamond weave fibers which boosts the tensile strength of the plating, it provides more protection per ton than standard armor (12% for Inner Sphere FF, 20% for Clan FF), but takes up more space on the 'Mech or vehicle (14 critical slots for Inner Sphere, 7 for Clan 'Mechs; two slots for Inner Sphere vehicles, one for Clan). The maximum amount of protection is not changed; merely the weight of armor required to achieve that level of protection. For a unit which already has maximum armor protection, it is therefore considered a weight-saving measure, at the cost of critical space. The weight savings for Endo Steel are greater than those saved by ferro-fibrous armor, but it is more costly and obviously more difficult to repair or add as an upgrade to a 'Mech.
First developed by the Terran Hegemony in 2571, Ferro-Fibrous armor was lost to the Inner Sphere during the Succession Wars. The Draconis Combine was the first to re-create it in 3040. Later, the Free Worlds League and Lyran Alliance would develop Light and Heavy versions of Ferro-Fibrous armor.
FF Armor is a Standard Rules piece of Equipment under the current system and was Rules Level 2 under the previous system. Armor of this type produced in the Inner Sphere has a Technology Rating of E while Clan produced armor has a Technology Rating of F. As with all combat vehicle armor types Ferro-Fibrous is assumed to have a Barrier Rating of 10.
Ferro-Fibrous armor is manufactured on the following planets:
Inner Sphere Armor Types
- TechManual, p. 205, "Armor - Ferro-Fibrous"
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- Technical Readout: 3145 Capellan Confederation, p. 24, "Behemoth II"
- Technical Readout: 3058 Upgrades, p. 106, "Typhoon"
- Objective Raids, p. 124, "Produced Gibson BattleMech Components"
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- Objective Raids, p. 105, "Produced Independence Weaponry Components"
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