We are frequently asked what the minimum thickness is when applying the TG-N8000 non-silicone putty from t-Global Technology. We reached out to the manufacturer on this and they replied with the following:
0.2mm is the minimum recommended thickness, because there may be ceramic particles within the putties that are in the region of 0.1mm in diameter. It is also not recommended for gaps more than 2mm.
TG-N8000 Products at DigiKey:
Adhesives, Epoxies, Greases, Pastes | Thermal | Electronic Components Distributor DigiKey