FIRESTEEL Firesteel is a third generation water based intumescent coating for internal structural steel. It can be applied by brush, roller or spray to provide 90 minutes fire protection to structural steel. Firesteel is halogen and solvent free with no solvent odour. No top seal is required for normal C1 internal conditions. HOW IT WORKS Firesteel is an INTUMESCENT coating. This means that in the event of a fire, the coating expands from between 1-2mm up to 100mm by a series of chemical reactions triggered by the heat of the fire. These processes do not start until around 220°C. This thick durable layer insulstes structural steel from the heat of even the most severe fire and its associated turbulent air currents and has been tested at Warrington Fire Research and other international test stations at 1100°C for 90 minutes to BS.476; Part 21. For more information about Firesteel click here to email us.