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Intumescent Paint for Steel
Rawlins Paints offers intumescent paint for steel in over 4,400 colours, providing up to 120 minutes of fire protection. Designed to protect structural steel in accordance with national building regulations, these coatings react under high heat to insulate the metal beneath. They help maintain the loadbearing capacity of steel structures, supporting safe evacuation and delaying collapse during fire incidents. Stocking the UK's leading fire retardant paint and intumescent paint brands, Rawlins Paints provides specialist coatings tested to British and European standards. These paints are suited to both on-site and off-site application and can be overcoated where necessary. Contact the Technical Team to determine the correct paint type and quantity required for your steelwork layout.
Bollom Brosteel Ultra 60
A new and improved revolutionary thin-film waterborne white intumescent paint for standard, interior structural steel members, providing 30 minutes fire protection in only one coat and 60 minutes in two coats - see below for details. For internal use only Water-based - quick drying thin-film intumescent coating Certificate of Conformance...
Thermoguard Thermocoat WI Ultimate
Interior use, water-based intumescent paint system, providing up to 90 mins fire resistance to structural steel and cast iron with a minimum number of coats. Optimised for Universal Beams, Columns and other open section steel: See Thermoguard Thermocoat WO Ultimate for steel hollow sections: For protection to exterior environment...
Zeroflame Aquasteel WB+
White thin-film waterbourne intumescent coating with new and improved formula to provide 30 and 60 minutes fire resistance on standard structural steel members in internal environments. It provides an easier and more efficient alternative to cladding steel members in plasterboard. New improved formula Achieves both 1/2 hour and 1 hour fire...
Nullifire SC802 On-Site Water-Based Intumescent Basecoat
A water-based, white, thin film intumescent coating for the protection of internal structural steelwork. Nullifire SC802 can provide up to 60 minutes fire resistance. Includes Optifire+ technology - reliable and traceable fire protection Please Note: We strongly recommend Tricomb Plastic Wet Film Gauges are used to help ensure correct...
Thermoguard Thermocoat WO Ultimate
Water-based intumescent paint system providing fire resistance to structural steel and cast iron with a minimum number of coats. A compatible decorative overcoat system ensures the system will enhance the building’s architectural and design features. Optimised for CHS, SHS and RHS hollow sections See Thermoguard Thermocoat WI Ultimate...
Jotun Steelmaster 600WF
Specially designed as passive fire protection for steel constructions. Designed to protect up to 60 minutes on a wide range of I section beams and columns. Will provide 90 minutes fire duration as per BS476 part 20-21. Suitable for structural steel exposed to internal environments up to corrosivity category C3 (ISO 12944 -2). Please Note: We...
Thermoguard Thermocoat S
Intumescent, solvent based paint for structural steel and cast iron. Provides up to 90 minutes fire resistance, maintaining the structural integrity of buildings. For protection to exterior environment steels For interior Universal Beams, Columns and other open section steel see Thermoguard Thermocoat WI Ultimate For interior steel...
Sherwin-Williams Firetex FX1003
Single pack, thin film intumescent coating, designed for site application by airless spray, to provide fire resistance for up to 120 minutes on structural steel. Certificate Application
Sherwin-Williams Firetex FX5062
Water-based one-pack TCEP free thin film intumescent coating, specifically designed for airless spray application to provide fire resistance for periods up to 90 mins on structural steel. Firetex FX5062 has been Certifire Approved. Note: application schedule required before using - click to see more information below. Certificate Application...
Nullifire SC804 On-Site Water-Based Intumescent Basecoat
A water based intumescent coating used for internal structural steel to C1 and C2 environments that can be top coated with a suitable topcoat for decorative and durability purposes. Includes Optifire+ technology - reliable and traceable fire protection Developed to give optimised loadings for up to 90 minutes Up to 120 minutes fire...
Nullifire SC801 On-Site Water-Based Intumescent Basecoat
Nullifire SC801 On-Site Water-Based Intumescent Basecoat is a water-based, white, thin film intumescent coating for the protection of internal structural steelwork, providing up to 120 minutes fire resistance. Please Note: We strongly recommend Tricomb Plastic Wet Film Gauges are used to help ensure correct film thicknesses are achieved...
Jotun Steelmaster 1200WF
One component waterborne acrylic thin film intumescent coating independently tested and approved for fire protection of structural steel exposed to cellulosic fire up to 180 minutes. Suitable for properly prepared carbon steel substrates. Please Note: We strongly recommend Tricomb Plastic Wet Film Gauges are used to help ensure correct film...
Bollom Brosteel Ultra 60 - 30min System for Universal Beams & Columns
We apologise for the current supply issue affecting some Bollom topcoats. Whilst we await a resolution from the manufacturer, please see below some suggestions for alternatives. If you’re looking for a system for; 30min Beams & Columns see: Zeroflame Aquasteel WB+ 30min System for Universal Beams & Columns 30min Hollow Section...
Zeroflame Aquasteel WB+ 30min System for Universal Beams & Columns
A pack with 4,400+ colours that provides sufficient intumescent basecoat (Zeroflame Aquasteel WB+) and coloured topcoat (Zeroflame Aquasteel WB+ Finish) to protect suitably primed, standard ‘ɪ’ shape structural steel beams and columns in internal environments to 30 minute fire resistance. Achieves 1/2 hour (30 mins) fire resistance on...
Sherwin-Williams Firetex FX5090
Water based TCEP free thin film intumescent coating, designed for application by airless spray to provide fire resistance for periods of up to 120 minutes on structural steel. Certificate Application
Bollom Brosteel Ultra 60 - 60min System for Universal Beams & Columns
We apologise for the current supply issue affecting some Bollom topcoats. Whilst we await a resolution from the manufacturer, please see below some suggestions for alternatives. If you’re looking for a system for; 30min Beams & Columns see: Zeroflame Aquasteel WB+ 30min System for Universal Beams & Columns 30min Hollow Section...
Thermoguard Thermocoat WI 30min System for Universal Beams & Columns
30min system pack for universal beams and columns provides sufficient intumescent basecoat (Thermoguard Thermocoat WI) and coloured topcoat (Thermoguard Flame Retardant Topcoat) to protect suitably primed, standard ‘ɪ’ shape structural steel beams and columns in internal environments to 30 minute fire resistance. Achieves 1/2 hour (30 mins)...
Thermoguard Thermocoat WI 60min System for Universal Beams & Columns
60min system pack for universal beams and columns is a pack that provides sufficient intumescent basecoat (Thermoguard Thermocoat WI) and coloured topcoat (Thermoguard Flame Retardant Topcoat) to protect suitably primed, standard ‘ɪ’ shape structural steel beams and columns in internal environments to 60 minute fire resistance. Achieves 1...
Zeroflame Aquasteel WB+ 60min System for Universal Beams & Columns
A pack with 4,400+ colours that provides sufficient intumescent basecoat (Zeroflame Aquasteel WB+) and coloured topcoat (Zeroflame Aquasteeel WB+ Finish) to protect suitably primed, standard ‘ɪ’ shape structural steel beams and columns in internal environments to 60 minute fire resistance. Achieves 1 hour (60 mins) fire resistance on...
Jotun Steelmaster 60SB
One component solvent based acrylic thin film intumescent coating independently approved for fire protection of structural steel exposed to cellulosic fire. It can be used as a mid coat or finish coat in atmospheric environments and is suitable on approved primers on carbon steel and galvanised steel substrates. Specially designed as a...
Sherwin-Williams FIRETEX FX9500
2-pack exterior durable intumescent offering 60, 90 and 120 minute fire protection both internally and externally without topcoat, which can be applied directly onto blast cleaned steel. Suitable for application in-shop and on site. Ultra durable - suitable for use in a C5-I environment, as defined in ISO 12944-2:1998 with appropriate...
Nullifire SC601 On Site & Off-Site Intumescent Base Coat
Single pack acrylic thin film intumescent basecoat for fire protection of internal & semi-exposed structural steelwork up to 60 minutes. This product is optimised to provide 60 minutes fire resistance to ‘I’ section beams and columns, hollow columns and beams, as well as cellular beams, concrete filled hollows and solid steel rods....
Bollom Brosteel Ultra 60 - 30min System for Hollow Sections
We apologise for the current supply issue affecting some Bollom topcoats. Whilst we await a resolution from the manufacturer, please see below some suggestions for alternatives. If you’re looking for a system for; 30min Beams & Columns see: Zeroflame Aquasteel WB+ 30min System for Universal Beams & Columns 30min Hollow Section...
Protecta Steel Paint FR-1
Single-component, fire-resistant acrylic paint available in white or 27 colours. Designed for use on loadbearing structural steel, including beams and columns. Provides up to 60 minutes of fire protection without requiring a primer or topcoat. Non-toxic, near zero VOC, and emission-free, making it safe for indoor environments. Durable...
Sherwin-Williams Firetex M72
Solvent based intumescent mastic coating, used for the repair of small areas of mechanical damage to Firetex range of intumescent coatings. Certificate Application
Zeroflame Aquasteel WB+ 30min System for Hollow Sections
A pack with 4,400+ colours that provides sufficient intumescent basecoat (Zeroflame Aquasteel WB+) and coloured topcoat (Zeroflame Aquasteel WB+ Finish) to protect suitably primed, standard Square, Rectangular and Circular steel hollow sections in internal environments to 30 minute fire resistance. Tested to British Standard - BS476 Part 21...
Bollom Brosteel Ultra 60 - 60min System for Hollow Sections
We apologise for the current supply issue affecting some Bollom topcoats. Whilst we await a resolution from the manufacturer, please see below some suggestions for alternatives. If you’re looking for a system for; 30min Beams & Columns see: Zeroflame Aquasteel WB+ 30min System for Universal Beams & Columns 30min Hollow Section...
Jotun Steelmaster 120SB
Jotun Steelmaster 120SB is a one component solvent based acrylic thin film intumescent coating independently approved for fire protection of structural steel exposed to celulosic fire up to 120 minutes. It can be used as mid coat or finish coat in atmospheric environments and is suitable on approved primers on carbon steel and galvanised steel...
Zeroflame Aquasteel WB+ 60min System for Hollow Sections
A pack with 4,400+ colours that provides sufficient intumescent basecoat (Zeroflame Aquasteel WB+) and coloured topcoat (Zeroflame Aquasteeel WB+ Finish) to protect suitably primed, standard Square, Rectangular and Circular steel hollow sections in internal environments to 60 minute fire resistance. Tested to British Standard - BS476 Part...
Hempel Hempafire Pro 315 Fast Dry 43361
Hempafire Pro 315 Fast Dry 43361 is a one component, solvent-borne, intumescent coating, optimised for 60 minutes for protection of structural steel against cellulosic fires, suitable for in-shop and onsite applications. Use as passive fire protection for structural steel in interior and exterior conditions (Up to C4 conditions ISO...
Sherwin-Williams Firetex FX2003
Sherwin-Williams Firetex FX2003 is single pack thin film intumescent coating, designed for in-shop application by airless spray to provide fire resistance for up to 120 minutes on structural steel. Certificate Application
International Interchar 2060
International Interchar 2060 is a single component, solvent borne, borate free, high solids, low VOC, thin film intumescent coating optimized for 60 minutes fire resistance to structural steelwork. Independently tested at accredited laboratories to BS476 Parts 20-21, AS 1530.4-2005 and AS 4100, and third party assessed and certified....
PPG SteelGuard 651
A one-component, thin-film, waterborne intumescent coating for fire protection of structural steelwork. Provides up to 120 minutes protection from cellulosic fires. Suitable for C1, C2 and C3 internal environments (ISO 12944) For dry internal (C1) environments no topcoat is required Tested and assessed to EN13381-8, BS476-20/21 and...
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Fire-Resistant Intumescent Paints for Steel Protection
Providing up to 120 minutes of protection, intumescent coatings for steelwork support critical fire resistance ratings in modern construction. These paints expand when exposed to high heat, forming a carbonaceous char layer that insulates steel from rapid temperature rise. This helps retain structural stability in line with Approved Document B and national codes, buying crucial time for building evacuation and fire service access.
These coatings are widely used in commercial, residential, and industrial buildings. Thin-film and epoxy-based thick-film systems suit a variety of settings, from indoor structural steel to exposed frameworks subject to moisture or hydrocarbon risk. All systems are tested under BS 476 or BS EN 13381 standards to confirm their performance against critical failure temperatures. For complete system compatibility, contact the Technical Team to calculate coverage and confirm application suitability.
Frequently Asked Questions
What happens if the wrong thickness of intumescent paint is applied?
Applying insufficient thickness will likely result in the steel exceeding its limiting temperature too quickly, leading to premature structural failure in a fire. Fire protection levels are based on tested dry film thickness (DFT) according to steel size and shape. Always follow the specified build-up per section factor, as improper application may also invalidate third-party certification.
How is the required paint thickness calculated for steelwork?
Calculations are based on the steel's section factor (A/V), fire resistance period required, and the product's limiting temperature. Intumescent paint datasheets or software use these values to determine the DFT needed per steel member. For accuracy and compliance, a project-specific specification should always be requested from the supplier or manufacturer.
Can intumescent coatings be used on cellular beams?
Yes, but the web post between beam openings is the critical failure area, not the flanges. Unlike standard beams, protection thickness for cellular beams must be determined using a detailed structural model by a qualified engineer. Intumescent coatings are suitable, but application must match the exact specifications given in EN 13381-9 or manufacturer assessments.
Is third-party certification important when choosing intumescent paint?
Third-party certification ensures the product has been independently tested and verified under strict quality control measures. Many project tenders and building control officers require this as a minimum. It offers greater assurance of consistent performance across batches and correct on-site installation. Always check the certification status when selecting fire protection systems.
Does intumescent paint provide corrosion protection?
Some systems incorporate anti-corrosive-primers or may require one as part of the full coating system. Not all intumescent paints offer rust protection on their own. Where corrosion risk exists - especially in external or damp areas - always ensure the primer is compatible and approved by the paint manufacturer for fire-tested use.