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From £21.42 inc VAT

For timber substrates that require Euro class B Spread of Flame (equivalent to UK class O) Russwood recommend HR-Prof, as a water based ready-to-use solution that is absorbed into the surface of the substrate.

The advantages of HR-Prof are summarised as follows;

  • Leach-resistant
    The treatment is leach-resistant , meaning that it can be used without a protective coating, allowing the cladding to weather naturally over time
  • No re-application
    Reapplication of the treatment will not be required during the life of the timber
  • Non-corrosive
    Timber treated with HR-Prof does not react with stainless steel nails
  • Colourless, odourless, non-toxic and solvent free
    This is a water-based solution which can quickly and easily be applied on-site and will not affect the look of the timber once dry
  • Fire protection
    Dramatically slows down fire spread and reduces heat and smoke generation, saving lives and restricting fire damage costs


  • The solution should be stirred well and applied (at a minimum temperature of 5°c) using a brush, roller or spray
  • The drying time between coats will be at least one hour (full drying time will take approximately 24 hours, at a temperature of 20°C/relative humidity 65)
  • Safety googles and gloves should be worn when handling the solution


Three coats will usually be required, depending on moisture content of the substrate and atmospheric conditions, giving a total coverage of 270ml per square metre.


Technical information

Additional information

HR Prof is supplied in containers of the following volumes;

  • 1 litre
  • 5 litres
  • 20 litres

For further details about this product, including combining it with a painted finish, please go to our fire retardant page.