What type of drum are you referring to. I do a lot of work in the asphalt industry and there are seals available working at high temps to seal the rotating drum against the stationary end plates or hoods. Is this what you need? Rod Nissen.
Combustion & Engineering Diagnostics
canded@iprimus.com.au
The choice of the "gasket" will depend on the material being handled and its temperature;also, how often does the endplate require to be opened,and how quickly does it require to be re-attached?