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I have received the following reply from Jim Picken of de Montfort, who is obviously still active although now retired. He has used ordinary bricks and has some advice on selecting the most durable. I am advised that the lining should be high alumina cement and using a low density, insulating aggregate like vermiculite, if possible.
'Hello Jeff, I had the same message from RedR but my reply has not been printed (probably because of my poor computer skills) Briefly, I have built incinerators using common bricks. Where possible I have skimmed the combustion chambers with High temp cement, but where not I have chosen bricks fired at the highest temperature available. In Senegal this worked during my stay but as usual no one bothered to tell me what happened later. Yours, Jim Picken'