Jotun Steelmaster 900WF Intumescent Paint

Availability: In Stock

£266.85 inc. VAT: £320.22

Jotun Steelmaster 900WF is a water-based intumescent paint for steel, which can achieve up to 2 hours fire protection.

This product should only be used in C1, C2 and C3 internal environments.

It comes in 18.5L tins.

Jotun Steelmaster 900WF is a new product designed to bridge the gap between the very popular 600WF and 1200WF. Initially designed to be the go-to product for 90-minute fire resistance steel projects, it has since proven to be just as useful on some 60-minute and 120-minute projects.

900WF uses an enhanced waterborne acrylic thin film intumescent coating, making it suitable for use in C1, C2 and C3 internal environments. It has a shelf life of up to 12 months in a sealed container. Store according to the storage guidance in the technical data sheet, which you can find in the tab above.

Fire Testing

900WF has been tested in accordance with BS 476 part 20/21 and EN13381-9. Furthermore, it has been Certifire approved – document CF 6140.

It is suitable for use on structural steel which is exposed to cellulosic fire.


Primers and Topcoats

900WF cannot be applied onto raw steel. It must be applied onto a compatible primer. If your steel is bare, we recommend using Jotun Pilot QD primer beforehand. On galvanised steel, apply the Jotun Penguard Primer onto your steel beforehand.

As with all intumescent paints for steel, this product achieves a white matt finish. In C1 environments, the intumescent paint can be left without a topcoat if this colour finish is fine.

In C2 environments, or C1 environments where a colour finish is required, the Jotun Conseal topcoat should be used.

In C3 environments, we recommend using the Hardtop XP topcoat. lease contact us for a quote with your desired RAL or BS Colour code.

When needing topcoats, please contact us for a quote with your desired RAL or BS Colour code. The topcoats which can be purchased on our website come in stock white.


900WF is easy to apply through brush and airless spray pump to give a good aesthetic finish. Ensure that you apply the product in a well-ventilated environment, which is at least 5 °C. Ideally, the application environment should be at least 10 °C.

Please refer to the application instructions in the data sheets tab above for more information.


For a free specification, please contact us on 01752 690997. If required for building control sign-off, we offer a free certificate of supply provided you have received a specification from us.



The information displayed about the products on this website is to be used for guidance ONLY. We advise that all customers contact our technical department to obtain a free no obligation specification and quotation before purchasing goods directly from the website.

Products purchased directly from our website without specification will NOT qualify for certification.

Please be aware that any negligence caused by failure to obtain the relevant advice, or availment of our specification and estimation service, will absolve International Passive Fire Ltd from any liability should Passive Fire Protection Products prepared, or used, by the purchaser, or any other parties, result in damage to property or human life, or for any monetary costs incurred due to incorrect usage.


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Data Sheets

  • What is the spreading rate of this paint?
    With all intumescent paints for steel, there is no fixed spreading rate. This is because the amount needed varies depending on the size and shape of your steels.For a full specification, please email us the steel paint enquiry form, which can be found in the data sheets tab. Email address:
  • How much does intumescent paint expand?
    Intumescent paint expands to 50 times its dry film thickness. It is important that there is enough room around your steels to accommodate for this expansion gap.
Fire Rating

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Coating Type

Internal or External Use