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AC fine test dust definition

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a graded, naturally occurring dust frequently used as a polydisperse test aerosol. It is composed of 68% SiO2, 16% Al2O3, and 4.6% Fe2O3. The fine grade has 39% of its mass in particles less than 5 micrometers in size and 73% in particles less than 20 micrometers in size.

See also:

acceptable quality level (AQL) definition
ac spark definition
acyl radicals definition
acid thioanhydrides definition
acidosis definition