Incendiary Grenades are a special type of grenade that releases a wave of fire upon detonation and leaves it there for a short period of time. The fire has a chance to burn any enemy caught in the blast or walking into the field of flame.
Tom Clancy's The Division Edit
In Tom Clancy's The Division, Incendiary grenades are specialty grenades, and thus incendiary grenades cannot be restocked at regular resupply boxes in a safe house; they must be collected from special dispensers or scavenged out in the field. An agent can only carry up to two incendiary grenades on their person, unless they are wearing the FireCrest Gear Set; the 2-piece set bonus lets them carry an additional three incendiaries, while the 5-piece classified set bonus lets them carry yet an additional grenade, up to a total of six incendiary grenades.
Tom Clancy's The Division 2 Edit
In Tom Clancy's The Division 2, Incendiary Grenades are only available when the player has the Demolitionist Specialization equipped. When they do, they will be able to refill their grenades at the appropriate ammo boxes.