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Technical Data

Steelmaster - 60WB Intumescent

Steelmaster 60WB

Steelmaster 60WB is a specially formulated Halogen-Free water based Intumescent coating for the fire

protection of structural steel in dry internal environments.


Product features

  • Steelmaster 60WB will provide fire resistance for periods of 30 and 60 minutes          
  • Suitable for dry internal “C1” environments
  • Low odour/1998 EPA Compliant
  • Accepted for “on-site” application
  • Excellent application characteristics and aesthetic appearance
  • Can be applied by spray, brush or roller (most 60 minute loadings can be achieved in a single spray applicaiton
  • Complements CDM regulations
  • Manufactured to BS EN ISO 9001:2000
  • Tested to BS 476 Part 21
  • Certifire Number CF568 (Fire tested and 3rd party Factory Production Control by Bodycote Warrington)


General information

Storage Temperature:

Minimum 5° C maximum 35° C
Shelf Life: 6 months in sealed containers (at 20° C)
Protect from frost and freezing conditions
Pack Size: 18.5 litre and 5 litre units
Pot-life: Indefinite (single pack)
Colour: White only
Drying: Air-dry
Appearance when Dry: Matt


Technical information

Flash-Point: Above 63° C (Setaflash)

Volume Solids:

70% ± 3%
VOC: Nil


Loading requirement

In order to establish the DFT required for the specified period of fir e resistance, it is necessary to first

calculate the Hp/A values (also known as A/V values). The DFT can then be calculated from the Steelmaster

60WB loading tables.

DFT per coat in microns 250 300 400 500* 700*
WFT per coat in microns


417 555 694 972
Theoretical spreading rate (m2/litre) 2.88 2.40 1.80 1.44 1.03

* Achievable by airless spray only. For DFT above 700 microns, a minimum of two coats will normally be

   required by airless spray.

The maximum achievable in a single coat by br ush is 555 microns wet/400 microns dry.

The maximum achievable in a single coat by roller is 347 microns wet/250 microns dry.

Exceeding the maximum film thicknesses indicated could result in cracking on drying.

DFT = Dry Film Thickness WFT = Wet Film Thickness



Primer chosen should be compatible with Steelmaster 60WB and the specification

Compatible Jotun primers include:

  • Penguard Express (2 pack)
  • Penguard Primer (2 pack)
  • Penguard Special (2 pack)
  • QD Primer (1 pack)

When applied over other manufacturers primers, compatibility should be checked. Consult Jotun’s Technical

Department for recommendations. Compatible primer should be applied and over coated in accordance with

the manufacturers instructions. For best results Jotun recommend a primer dry film thickness (DFT) of 50 to 150 microns.

Less than 50 microns DFT the steel may not be adequately covered and rust spots may result when over coated with water based materials.

Certain types of primers must be avoided as they could cause adhesion problems. These include thermoplastic

materials such as Chlorinated Rubber and bituminous primers. Certain “mastic” products and primer / finish

products may also prove to be unsuitable for a number of reasons, including short overcoating times.

Jotun do not recommend the use of Steelmaster 60WB directly over zinc based zinc-rich type products. (If a zinc-rich primer has been used or is to be used, it is advisable to seal with a suitable tie-coat prior to delivery to site).

Consult Tayfire or Jotuns' Technical Department for further advice on compatible primers.

Note: For off site projects, consult Jotun for advice.


Surface preparation

Steelmaster 60WB will normally be applied to previously blasted/primed steel substrates.

Prior to application of a compatible primer, the substrate must be abrasive blast-cleaned in accordance

with standard ISO 8501-1:1988. Cleanliness Sa2.5. Roughness 50 to 85 microns Ry5. Coating should occur

before degradation of the surface takes place (normally within 4 hours). If oxidation takes place, the steel

must be re-prepared. The surface must be dry and free of dust, salts, grease and any other contaminants

immediately before coating.


Site conditions during steelmaster application

The steelwork should be protected from rain or condensation during the application and drying of

Steelmaster 60WB. If Steelmaster 60WB is allowed to get wet, defects may occur . The surface must be dry

and free of dust, salts, grease and any other contaminants immediately before coating.

Steelmaster 60WB can only be applied when the air and steel temperature is above 5°C but below 40°C.

Relative humidity should be below 80% for successful application. The temperature of the substrate must

also be at least 5° C above the dew-point on a rising thermometer.

Application Data

Mixing: Stir thoroughly before use until the product is homogeneous
Application: May be applied by airless spray (brush/roller small areas only)

Airless Spray

Pump Ratio: Minimum 45:1


Pressure at Tip: Minimum 20MPa (200kp/cm2 2800 psi)
  Tip Size: 17-21 thou (0.43-0.53mm)

Tip Angle:

30° -50°
  Filters: 30 mesh internal filter normally required

Hose Diameter:

(ID) 10mm
  Hose Length: Maximum 60 metres


For brush application, use a “laying on” technique to avoid heavy brush marking.


A short piled roller will produce a light textured finish


Thinning must be avoided - the product is supplied ready for use. Incorporation
  of water could result in film defects. Equipment should be cleaned immediately
  with fresh water.
Surface Temperature: Minimum 5° C, maximum 40° C. The temperature of the substrate must also be at
  least 5° C above the dew-point
Relative Humidity: Maximum 80% (see comments under “recoat times”)


Recoat times in hours

Indications of approximate recoat times (ie overcoating Steelmaster 60WB with itself) taking into account

the following loadings:

Hours per brush application @ 555 microns wet

(approximately 742 grams)/400 microns dry

Hours per spray application @ 972 microns wet

(approximately 1300 grams)/700 microns dry

The following figures also represent approximate drying times.

    30% RH 50% RH 70% RH
10 C Brush 3 hours 4 hours 6 hours
  Spray 6 hours 8 hours 12 hours
23 C Brush 2 hours 3 hours 4 hours
  Spray 4 hours 6 hours 8 hours
35 C Brush 1 hour 2 hours 3 hours
  Spray 2 hours 4 hours 6 hours



  • This information is assuming good air movement and ventilation. If there is little or no air movement,
    re-coating times will be approximately twice the figure indicated above.
  • Drying times are doubled at 5°C or at over 70% RH.
  • No more than two coats by spray and four coats by brush/roller in any 24-hour period.
  • Please ensure, however, that the previous coat(s) are fully dry in all areas before recoating.
  • High humidity and low air movement or low steel temperatures can result in condensation on the
    steelwork causing prolonged drying times and possibly poor adhesion between Steelmaster 60WB and
    the primer.
  • When end use is for dry internal situations, there is no requirement for a topsealer. However, a
    topsealer may be considered for aesthetic reasons.
  • Final drying time before application of the topsealer is a minimum of 36 hours. For best results, the
    topsealer should be applied within 14 days.


Typical Paint System Information

Guidance on wet/dry film thickness determination can be taken from ASFP TGN 007

Wet film thickness checks

Wet film reading should be taken regularly during application, using an aluminium or metal wet film

thickness comb. The readings should be regarded as a guide only to enable the applicator to establish a

technique for achievement of the required dry film thickness specification. During multi-coat operations,

wet film readings will prove unreliable when applying subsequent coats of Steelmaster 60WB.

_________________________________________________________ __________________________________________

Dry film thickness checks

Take dry film thickness readings (DFTs) as soon as the coating is sufficiently hard to allow readings without

indenting the surface.

All DFT specifications are mean values, and the DFT of the primer must be deducted from the readings to

give the dry film thickness of the intumescent coating only.


Damage Repair

Any damaged areas should be abraded back to a sound surface. The abraded surface must be clean

and dry before re-applying.

Do not apply a topcoat until all the readings are in accordance with the specified thickness.  Ensure that the Steelmaster 60WB is completely dry before applying Topcoat (if topcoat is requried).


Topsealer (before topcoating refer to the above paragraph)

For most projects, we recommend the use of Waterfine Top Coat (water based acrylic) at a DFT of 50 microns.

Other water based acrylics can be applied - subject to successful trial/trial area.



Steelmaster 60WB must be stored in accordance with National Regulations.  Storage conditions are to keep the containers in dry, cool well ventilated space away from source of heat and ignition. Containers must be kept tightly closed. Minimum temperature 5°C Maximum temperature 35°C



Handle with care.  Stir well before use.


Packing Size

Large: 18.5 litres

Small:  5 litres


Health and safety

Please observe the precautionary notices displayed on the container.

  • Apply under well-ventilated conditions.
  • Do not breath or inhale spray mist/vapours.
  • Avoid skin contact.
  • Spillage on the skin should immediately be removed with suitable cleanser, soap and water.
  • Eyes should be well flushed with water and medical attention sought immediately.

For detailed information on the health and safety information with precautions for use of this product,

please refer to the appropriate Material Safety Data Sheet.



Jotun is a World Wide company with factories, sales offices and stocks in more than 50 countries.


The information in this data sheet is given to the best of our knowledge based on laboratory testing and

practical experience. However, as the product is often under conditions beyond our control, we can not

guarantee anything but the quality of the product itself. We reserve the right to change the given data

without notice.



TayFire (International) Ltd

Station Road




Tel:  +44 (0) 1821 641007

Fax: +44 (0) 1821 641008