Average particle size of powdered gold is:
A fine powder is formed by chemical precipitation or by atomizing the metal. The particle sizes vary (average 15 µm). The pellets are mixed with soft wax (0.01% organic wax, which is burnt off prior to use) and then wrapped with gold foil (No. 3), rather than sintering the mass, like for mat gold.
Ref: Basic Dental Materials 4th ed page no 160
10 μm
15 μm
30 μm
0.1 mm