Heat exchange media also called heat sink, is the key components of the thermal storage system, 

which has been widely applied in kinds of RTO (Regenerative Thermal Oxidizers), 

which is used to Volatile Organic Compounds (VOCs) and odorous emissions etc.

The significant advantages of ceramic blocks are excellent thermal shock resistance and quickly exchanging heat.

The available materials are:

Alumina, Dense Alumina, Cordierite, Dense Cordierite, Mullite, Corundum Mullite Silica

and also can according to your requirements.