There is provided a multi-segment component for an aerosol generating article, the multi-segment component including a combustible heat source; an aerosol-forming substrate downstream of the combustible heat source; a wrapper circumscribing the combustible heat source along at least part of a length of the combustible heat source; and an intumescent layer between the combustible heat source and the wrapper and circumscribing the combustible heat source, the intumescent layer being formed from an intumescent inorganic glue.