Price £239.93
In stock
Jotun SteelMaster 120SB White
In stock
Next day delivery available

Jotun SteelMaster 120SB is a single-component solvent-based intumescent coating that provides up to 120 minutes fire protection of structural steel exposed to cellulosic fire.

SteelMaster economic coating systems are an excellent option for areas of buildings demanding a protective finish with a high focus on aesthetics. Long-lasting fire performance is assured everywhere - even in the most severe conditions. Bring your steel to life. Expressing steel as an architectural feature can be an intrinsic part of modern architecture. The structure can be the hero. Form and function work together in tandem to create architecture that can, quite literally, show its strength - without the need for boxing in or using less aesthetically pleasing cementitious coverings.

Areas of Use

Designed for use in internal and external C1 to C4 environments In the event of a fire the intumescent coating expands to insulate the structural steel from the fire.

Suitable on structual and carbon steel substrates exposed to a wide range of corrosive enivronments.

Substrates: Structural steel and galvanised carbon steel.

Available in White

Approvals and Certifications
  • BS 476 part 20/21


  • Majority of steel sections covered
  • Ready to use 
  • Reduced application time
  • Easy spray application
  • Reduced site costs

Technical Information

Brand Jotun
Application Airless Spray or Brush
Drying Time Touch dry in 30 mins @ 23°C, dry to recoat 8 hours (minumum)
Mix Ratio Single pack

Dry film thickness: 200 - 720 μm

Wet film thickness: 280 - 1000 μm

Cleaning Solvent: Jotun Thinner No.7
Storage 18 months @ 23°C


Technical Data Sheet

Safety Data Sheet

Application Guide



To secure lasting adhesion to the subsequent product all surfaces shall be clean, dry and free from any contamination.

Substrate                              Minimum                                    Recommended                         
Carbon steel Clean, dry and undamaged compatible coating (ISO 12944-4 6.1) Clean, dry and undamaged compatible coating (ISO 12944-4 6.1)


The product can be applied by:

Spray Use Airless Spray
Brush Recommended for stripe coating and small areas, care must be taken to achieve the specified dry film thickness. 


The product must be stored in accordance with national regulations. Keep the containers in a dry, cool, well ventilated space and away from sources of heat and ignition. Containers must be kept tightly closed. Handle with care.

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