It doesn't matter how thick it is. If you wrap your hand in silver foil the silver foil is a weapon - a manufactured object that you use to damage a target.I dont know if you know what ‘silver plating’ means. But it is a very thin foil over the metal. Think ‘tin foil’ but much much thinner.
The silver itself does zero damage.
It's the silver that does the damage. The object underneath it supplies the kinetic energy that enables the foil to do the damage.