Greetings All, you are the best! Do have a look at my WEDC presentation of this past Tuesday, the 14th, the link following. A missing link to industrial development has been the very high cost of imported, high temperature, refractory brick. Research and knowledge however, indicate that refractory brick can be developed almost anywhere, through experimentation. In combining common clays with common sand, in a ratio of roughly 20 to 80, high temperature brick can be formed, dried and fired. Most if not all kinds of industry can be developed, supported by the high temperature kilns made possible. drive.google.com/file/d/1_T5ejTp8JmyBp2t...7Oa/view?usp=sharing Bye for now, Reid Anthony Reid Harvey, ceramic industrial designer