And to add to this, TGA is a method for determining mass loss, from which one can infer Noack:
To decide if TGA is appropriate for your polymer material testing goals, it is helpful to understand how thermogravimetric analysis works.
www.ace-laboratories.com
Thermogravimetry thermal analysis (TGA) testing - ASTM E1131, ISO 11358
www.intertek.com
TGA provides quantitative measurement of mass change in materials associated with transition and thermal degradation. TGA records change in mass from dehydration, decomposition, and oxidation of a sample with time and temperature.
vs Noack:
en.wikipedia.org
"In this test, a sample is heated at 250 °C for 60 minutes with a constant flow of air over it. The weight fraction lost is the result for the Noack volatility test."
So, if you run TGA at 250 on an oil with a known Noack of 8% then on another product and it loses less mass, you can infer that Noack of the other product is 8% or lower.