Does fireproof putty for cable trays need to be heated

When exposed to heat, the intumescent property of this putty causes it to expand, creating a barrier that prevents the spread of fire and smoke. Fire Putty is a silicone-based, non-hardening fire putty for cable and pipe penetrations. In case of fire, a blockade of fire-resistant filler is formed that restricts the passage of smoke and fire. Fire Putty is listed in most environmental registers, which means that the product is not classified. FM011 Moldable Firestop Putty is an industry leading, one-part, flexible, intumescent putty ready-to-use for wall or floor openings containing cable trays, cable bundles, plastic pipes and/or conduits providing up to a 3-hour fire resistance rating. Highly intumescent, and providing rapid expansion. Where cables pass through shafts, walls, slabs, or enter electrical panels or cabinets, openings shall be tightly sealed with firestopping materials in accordance with design requirements.