This invention relates to an intumescent product for the sealing of apertures for services conduits between partitions such as walls, floors and ceilings within buildings. It is particularly, but not exclusively, concerned with sealing of such apertures upon occurrence of a fire in the vicinity of such apertures. All buildings built in the United Kingdom must conform to tire protection standards. The standards are more onerous to satisfy in the case of hotels, business premises and all commercial buildings in general. One aspect that United Kingdom legislation covers, mirrored in the legislation of other countries to a similar level is the closure of apertures between adjacent rooms, partitions comprising floors, ceilings and walls. The use of brick work, block work and concrete partitions for supporting structures is almost universal; when apertures are made within the partitions, then opportunities for the spread of tire are provided; airflow is possible through an untreated aperture. Building regulations state that tire-stopping elements must be provided to prevent the spread of fire. Typical fires-topping elements comprise packing of apertures with intumescent compounds and the use of pipe collars. The present invention seeks to provide a solution to the above problems.