Palladium sponges have high porosities- 75-95% of volume is empty space. Palladium sponges are produced by injecting gas or mixing a foaming agent into molten metal which creates a froth that is stabilized by a high-temperature foaming agent. Palladium Sponges are generally immediately available in most volumes. Sponge traits include low density, high stiffness, high energy absorbance, low thermal conductivity, low magnetic permeability, fire resistance, and sound dampening qualities.

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