Jotun SteelMaster – the reactive fire protection system. Our thin film intumescent coatings are specifically formulated to provide a chemical reaction upon heating, changing physical form to provide fire protection through a thermal insulation and cooling effect. SteelMaster products are designed to protect against cellulosic fire anywhere between 30 minutes and 120 minutes. SteelMaster is typically used in airports, shopping malls, factories, buildings and in power plants. We call it fire protection that brings out the beauty of steel design.