Philip Baldwin : You must school your self to understand two specific conditions, 1) the Materials ability to adsorb the Freaky Hot Exhaust Gases, its
Specific Heat Capacity, and its ability to deliver that Heat Energy through itself to the Surface of our Cob Thermal Mass Bench, its
Thermal Conductivity
As Soapstone has exactly what we want I have shared a link below :
http://www.traditionaloven.com/articles/691/soapstone-data-info
Please note that this site
traditionaloven.com is a vast source of practical information mostly without a lot of jargon using simple terms
More technical information from the
engineeringtoolbox.com site with link
http://www.engineeringtoolbox.com/thermal-conductivity-d_429.html
http://www.engineeringtoolbox.com/specific-heat-capacity-d_391.html
Sorry this was not more timely, hopefully it will make up for that by its usefulness, For the Crafts ! Big AL