Density of Rust as a Function of Diameter

Factual Questions
1

Hi all,

I would like to determine an approximate relationship between a rust particle diameter and it’s density.

Wikipedia reports the density of Fe2O3 as 5.242 g/cm3 (solid). I would consider this the upper limit on rust density, which should decrease with increasing diameter. However, I have no other sources to base a range of density values as a function of particle diameter.

If anyone is aware of a density value for rust, please inform me.

Thanks!

2

Purchase Iron Oxide from amazon. A 5 lb. bag is available. Take the volume of the bag. This would probably be an intermediate value as the particle size is quite small so packing would be quite good.

3

Packing density shouldn’t depend on particle size; it depends on having a mix of sizes. A mix of 100 and 500 um particles (for instance) will have a greater density than either one alone, since the smaller particles will fill the voids left by the larger ones.