Absorption coefficient of aluminium for microwaves

[Chromosom]

I am looking for an exact value of absorption coefficient of aluminium for microwaves, but I can not find it in the internet. Anyone knows where I can find it?

 

[marcusl]

Are you aware that, since aluminum is highly conductive, it mostly reflects rather than absorbs microwaves?

 

[davenn]

apart from what Marcusl said, and I agree with,

if you need an exact value ... then what is the exact frequency of the microwave radiation
absorption amount will change with frequency for any substance

Dave

 

[johnbbahm]

While the absorption may be difficult to find the reflectance is not,
So since the broad spectrum microwave reflectance is above 97%,
We can infer any possible absorption is less than 3%.
http://www.npl.co.uk/science-+-technology/optical-radiation-and-photonics/optical-characterisation-of-materials/aluminium-reflectance-spectrum