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Intumescent Coating for Steel

Product 83


Intumescent, waterproof coating system to improve fire rating of structural steel and aluminium

Not available to purchase online.

We need to ask you a few more questions and ensure this is the suitable product for your needs.

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£0.00 ex. Vat



Intumescent Coating for Steel

Water-based intumescent coating for the protection of steel and aluminium. Easily applied to surfaces using a brush, roller, or also spray, which creates a smooth finish. Therefore, easily painted over with any good quality paint for decorative purposes.

Unprotected steel can lead to building construction collapsing in a fire.

It can take just a few minutes for unprotected steelwork in a building to attain temperatures of around 550ºC in a fire. At this temperature, steelwork loses its load-bearing capacity and the structure is likely to collapse. Therefore, giving little time for people to evacuate and even less time for the fire service to bring the fire under control.

Building regulations and legislation demand fire protection to upgrade the fire resistance of buildings. The Envirograf® range of intumescent coatings can certainly stand the heat.

  • EP/FS/INT offers up to and including 90 minutes of fire protection and can be applied both on and off-site.
  • EP/FS/INT is a waterborne product with low odour, an ideal solution for on-site application. A full range of top sealers, both waterborne and solvent-based are also available to complement the intumescent coating.

We provide an extensive range of fireproof coatings, intumescent paint, wallpaper, and sprays compatible with a range of materials. Explore our Fireproof Coatings online.

Envirograf ® passive fire products carry the hallmark of excellence, reflecting the high standards that prevail in its laboratory, test rig, and manufacturing plant. Envirograf® passive fire products are subject to rigorous quality control which, at all stages, ensures products remain at the leading edge of fire containment technology. This quality has earned the company and its passive fire products a high reputation. With its operating system accredited to ISO9001.


– Provides up to 90 minutes fire protection, dependant on the thickness of metal it is applied to

– Ideal for both internal and external protection of structural steel and aluminium

– Dries in approximately one hour under normal conditions

We’ve tested our intumescent steel paint to address the popular question of the feasibility of painting the Product 83 over the existing coats of paint on top of the steelwork.

The test was carried out on two equal pieces of I-beam. Both specimens were coated with 8 coats of standard paint, after which, one of them was coated with Product 83 (Including EP/FS/60P Primer). The test lasted for 150 minutes.

After the test was stopped and the charred intumescent was brushed off, we discovered that the original coatings remained unscathed.

Since the date of this test, Product 83 has enjoyed great popularity among factories, public buildings and businesses alike by providing 2 hour fire protection without the need to remove the existing coating.


Application Instructions

Ensure that steel is cleaned and free from loose rust. Over existing paints, ensure that the surface is clean, dry, and free from grease or loose material before applying the primer. Slightly abrade any top coat to provide a key for the primer.
Apply Envirograf® EP/FS/P primer at a rate of 8m² per kg. If a primer has already been applied and is sound, then there is no need to apply Envirograf® primer. Apply Envirograf® intumescent coat EP/FS/IN over the primed surface by brush, roller, or spray to give the correct loading as specified. Depending on the thickness of the coats applied and the air temperature and humidity, each coat will take approximately one to two hours to dry.
Do not apply the Envirograf® intumescent coat EP/FS/IN externally if rain is imminent. The top coat must be applied for weather protection or the area should be temporarily covered over to prevent damage to coated areas by rain, snow, or water leakage. If a paint contract is not going to be completed in a day, it is advisable to concentrate on one area at a time, thus ensuring all the coats including a top coat can be applied in the same day. This does not apply to internal applications where rain, water, or moisture are not a problem.
Where the steel is external, application of an undercoat is advisable. Use EP/FS/XP at the rate of 10m² per litre. Allow 4-6 hours for this coat to dry.
For internal use apply the EP/FS/TCW top coat at a rate of 10 -12m² per litre. For external use apply the EP/FS/TCE top coat at a rate of 2 coats at 10 -12m² per litre. The top coats can be supplied in any RAL or BS colour.

Case Studies

  • Farnham Castle steel framework

    12th century Farnham Castle protected with intumescent steel paint to meet building regulations.

  • Intumescent steel paint used over existing coating

    Intumescent steel paint used to protect swimming pool to provide 1 hour fire protection.

  • Canary Wharf Crossrail Station

    Intumescent coatings are used to provide fire protection to timber and steel construction.

Order References / Sizes

EP/FS/P Primer

A grey, water-based primer for use on internal or external steelwork.

Ref                     Volume

EP/FS/P             1 litre

EP/FS/P             2.5 litre

EP/FS/P             5 litre

EP/FS/P             20 litre

EP/FS/IN/WB Intumescent coating

A water-based, intumescent coating for the protection of steel and aluminium. Requires a top coat.

Ref                              Volume

EP/FS/IN/WB           1 litre

EP/FS/IN/WB           2.5 litre

EP/FS/IN/WB           5 litre

EP/FS/IN/WB           20 litre

EP/FS/IN/SB Intumescent coating

A spirit-based, intumescent coating for the protection of steel and aluminium. Requires a top coat.

Ref                              Volume

EP/FS/IN/SB           1 litre

EP/FS/IN/SB           2.5 litre

EP/FS/IN/SB           5 litre

EP/FS/IN/SB           20 litre

EP/FS/TCW Internal top coat

A water-based, protective top coat for internal use only. Gloss as standard, matt & satin also available.

Ref                     Volume

EP/FS/TCW       1 litre

EP/FS/TCW       2.5 litre

EP/FS/TCW       5 litre

EP/FS/TCW       20 litre

EP/FS/TCE External top coat

A spirit-based, robust top coat designed for external use. Satin only.

Ref                     Volume

EP/FS/TCE        1 litre

EP/FS/TCE        2.5 litre

EP/FS/TCE        5 litre

EP/FS/TCE        20 litre

Intershield flexible top coat

A top coat designed for use in areas with high moisture, such as swimming pools.

1 litre

2.5 litre

5 litre

20 litre


1 litre

2.5 litre

5 litre

20 litre

Mordant solution

A primer for use on galvanised steel before application of protective coatings.

1 litre

2.5 litres

5 litres