Originally Posted by
robpage
Aluminium powder is exothermic , when it catches it is almost explosive , sheet aluminium melts at 600 degree C without igniting, the Reynobond is available in 3 insulation specs polyurethane (PE )not to be used over 10 M high, fire retardant not over 30 M high and non combustible . the management used PE and saved £300,000 on a 60 M high tower . the insulation is what spread and fed the fire , melting the Aluminium . So the metal bare is safe , burning PE is what melted it