HR-Prof Fire Protection for Structural Timber and Porous Materials

HR-Prof is a fire retardant treatment for wood and other porous combustible materials

Specified and used extensively in the EU and now here in the UK for timber substrates that require Euro class B Spread of Flame (equivalent to UK class O), HR-Prof is water based ready to use solution that is absorbed into the surface of the substrate.

HR-Proof is a water based fire retardant treatment for wood and other porous combustible building materials. This product is non-hazardous, can be used both internally and externally. Tested to Euro-class B (equivalent to UK class “0”) for surface spread of flame.

The result of the treatment with HR-Prof? Natural, resistant and fireproof wood or porous material!

Trade / DIY benefits

• Water based
• Euro class B Spread of Flame (UK class O)
• Absorbs in to the surface
• Anti-fungicidal properties
• Makes a good fungicide
• No colour or odour
• Non-toxic
• Solvent Free
• Non harmful to the environment
• Internal and external use
• Once dry cannot be broken down by water or humidity
• Does not leach

Trade / DIY applications

• Wood fire retardant
• Porous material fire retardant
• Timber frame building fire retardant
• External wood cladding fire retardant
• Staircase fire retardant
• Truss fire retardant
• Door fire retardant
• Joist fire retardant
• Wooden floor fire retardant
• Stable fire retardant
• Log cabin fire retardant
• Thatch roof fire retardant
• Boat fire retardant
• Fence fire retardant
• Garage fire retardant

How to Step-by-Step

1. The substrate must be clean, dry and free from contamination; remove existing coatings by stripping or
   sanding. Moisture content should be 20% or less. It is recommend that a sample of the substrate is coated
   to establish both absorption properties and possible colour change.
2. The application rate is 3.7m² per litre and is usually achieved in approximately 3 coats depending on moisture content of the substrate and atmospheric conditions. Coats should be applied at intervals of a minimum of 1 hour giving a total coverage of 270ml m² (minimum). Do not mix with other solutions, stir well. Use brush, roller, spray (use appropriate mask when spraying), dip or vacuum method. Minimum temperature for application 5ºC.
3. If treated timber is to be over-coated we recommend testing a small area first before fully over-coating with
   varnish, stain or paint. Care should be taken that the fire retardant properties are not compromised,
   maintenance coating may in time affect the film thickness, we recommend that the film be stripped back
   periodically by using a hot air method. Substrate must be completely dry before over-coating.
4. A minimum of 1 hour between coats. Full drying time approximately 24 hours at +20ºc / 65 relative humidity.

Coverage

HR Prof works on the basis of absorption, not on the number of coats, the absorption rate for HR Prof on most wood species is 300 gms per m² (270 m/l) 3.7 m² per litre, in the case of Western Red Cedar the absorption requirement is higher, 400 gms (360 m/l per m²) 2.75 m² per litre. Application is by Brush, Roller, Spray, Dip or Vacuum.

The rate of absorption will vary dependent on a number of factors ie. wood species, rough sawn wood, planed all round (PAR) wood, and moisture content, which should be below 20%. Cut ends should have HR Prof re-applied with a minimum of two coats.

Example: 100 m² of Siberian Larch face area would require the application of 27 litres of HR Prof plus 5% extra for overspray/spillage, if rough sawn wood, 1 or 2 coats should be sufficient to absorb the full 27 litres – PAR wood may require 2, 3 or more coats to achieve the same amount of absorption.

However many coats are applied ALL of the liquid must be used on a given m² face area. In a factory-controlled environment, the application rate may be governed by weight to assess and confirm the correct take-up of the liquid.

Product sizes

Available in 1 Litre, 5 Litre and 20 Litre packs.

Downloads

Download HR-Prof data sheet.