Natural Weaponry
Natural Weaponry such as claws are given a Power rank and a material strength. The first refers to the damage inflicted with them, the second to the materials they can affect. The favorite example is Wolverine, whose Class 1000 material claws only inflict Ex(20) damage against materials without a material strength rank. Against materials with a material strength rank, including the outer suit of Titanium Man, Wolverine shreds with Un(100) ability. As far as damage goes, he inflicts 20 points of Edged damage when attacking. This same approach is taken for swords (Black Knight, Silver Samurai) and other sharp pointy items, and for the effects of acid and Bio-Physical Control attacks.
Claws and other sharp instruments do not affect Force Fields with their material strength. They would inflict their normal damage in overloading that Force Field.