Thermocoat WI water based intumescent paint system provides up to 120 minutes fire resistance to structural steel and cast iron. Architectural and design features can be enhanced with use of a compatible overcoat system. (Range of topcoats are either water based or 2010 compliant and safe to use in line with manufacturer’s instructions). Thermocoat WI is designed for use on I and C shaped steel and hollow bracing, for hollow posts, see Thermocoat WO. How do intumescent paints work? Heat from a fire triggers a catalytic reaction and causes the insulating char layer in the coating to expand to up to 50 times the paint thickness. This layer keeps the steel below its critical temperature for longer (time specified with the coating) which maintains the structural integrity of the steel. Thermoguard Thermocoat WI Intumescent Basecoat is low odour and water based, making it user and environmentally friendly. It’s also easy to apply by brush, roller or airless spray. Water based Intumescent for structural steel For 30 mins protection: 1 thick coat – 2.5kg 4 linear m, 5kg 8 linear m, 20kg 32 linear m – if in any doubt please contact us. For 60, 90 or 120 minutes protection: contact us for further advice specific to your project Please Note: If you require certification, you need to complete an enquiry form before placing the order for the product. This ensures that you apply the correct volume to achieve the required fire rating. The enquiry form is available to download from the ‘Data Sheets’ tab on this page. Important Notes for Application Ensure steel is free from rust and millscale and primed with Thermoguard High Build Metal Primer to 75 microns DFT ( or alternative good quality anti corrosive primer compatible with intumescent paints) in line with manufacturers instructions. Treat galvanised surfaces with “T” wash/Mordant solution & prime with zinc phosphate or other primer for steel. Apply Thermocoat WO by brush, roller or airless spray as per recommended specification. Important: please contact us to obtain a basecoat application schedule ( a wet film gauge will be supplied with the product to help comply with the spec). * Ensure basecoat is fully dry (hard to the touch) before applying the topcoat. Note that temperature and humidity will affect drying times. Basic Drying and Overcoat Times Under Normal Conditions Brush / Roller Application Surface dry: minimum 2 hours Recoat: minimum 4 hours Overcoating with Flame Retardant finish: minimum 10 hours Spray application Surface Dry: minimum 4 hours Recoat: minimum 10 hours Overcoating with Flame Retardant finish: minimum 48 hours Before purchasing any intumescent coatings or related products from Palatine Paints, it is essential to contact our technical support team to obtain a project-specific specification and expert guidance. The information provided is intended for general guidance only and should not be relied upon as a substitute for professional advice. Palatine Paints accepts no liability for any damage to property, risk to human life, or financial loss resulting from incorrect specification, surface preparation, application, or ongoing maintenance—particularly where such issues arise due to failure to consult our technical team. This includes, but is not limited to, negligence by the purchaser or applicator, or failure to follow the recommended procedures and advice. Please Note: Thermoguard products are exempt from Palatine Paints’ standard returns policy. Returns are only accepted if the product is faulty. Thermoguard do not accept returns for any other reason, including change of mind or incorrect ordering.
