In contrast, many of the three-dimensional aluminophosphates exhibit excellent thermal stability. Most remain crystalline after the 400-600 "C calcination necessary to remove
the organic template and free the intracrystalline void volume for adsorption or catalysis. Indeed, many retain their structure after calcination at 1000 C. Several
materials tested for hydrothermal stability show virtually no structural loss when treated
with 16% steam at 600 "C.