Even if firestop systems are tested at very high temperature (usually more than 1.000°C.), these tests are under fire conditions (so with a growing fire curve up to 2 or even 4 hours maximum) and not day to day constant exposure to high temperatures. Most firestop systems start to react, changing chemically or physically at relatively low temperatures (100 to 200°C), such as the intumescent materials and the endothermic coatings. Therefore, these products cannot be used as “high temperature sealant”.