A fire resistant neutral cure silicone for the protection of engineered movement joints in buildings. Conforms to EN1366?3 (penetration seals) and EN1366?4 (linear joint seals) with an integrity and insulation value in excess of 4 hours for certain joint geometries. Prevents the spread of flame, smoke, toxic gases and water. Halogen free to reduce the risks of toxic fumes and corrosion in the event of fire.