An insulation material comprising the double salt of aluminum potassium sulphate and method of producing such. Aluminum sulphate materials and potassium sulphate materials are combined to form aluminum potassium sulphate which is then dehydrated to remove the water of hydration. Porous forms are made by mixing the hydrated aluminum potassium sulphate with a binder before dehydration. The resultant dehydrated sulphate expands greatly to provide an insulative material which is of lightweight and inorganic.
RELATED APPLICATION
This is a divisional application of Ser. No. 08/429,195 filed Apr. 26, 1975 now U.S. Pat. No. 5,589,023, that issued Dec. 31, 1996 was filed Apr. 26, 1995, which in turn was a continuation-in-part of U.S. patent application Ser. No. 08/183,477, filed Jan. 18, 1994 now abandoned.
