Marvon intumescent seals are an essential complementary accessory for the construction of high performing fire doors. In order to obtain a certificate of approval a fire door must possess certain characteristics that provide a complete barrier to fire and smoke for a variable period of time in relation to the requested approval. (30, 60, 90, 120 minutes). The European standard for fire doors is being prepared under a mandate from the European Commission. As the European standard is as yet incomplete, CE marking for fire performance is not possible. Each member state of the EU therefore refers to national standards, which are updated periodically with the European standards that have been completed. To date, therefore, there are different criteria for importing fire doors in a country and it is essential that functionality and resistance be guaranteed both for the door and for the components of the same.