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HR Prof Fire Retardant Treatment

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Product Description

This was performed according to NT FIRE 053 Method B which involved accelerated weathering by cycles of rain, drying and also UV light for a total time of 1000 hours. The accelerated weathering was performed between 5 November and 17 December 2007 by SP Technical Research Institute in Sweden.

HR-Prof fire performance properties will not compromise other critical engineering properties in the timber such as strength, durability, or hygroscopicity.

HR-Prof Flame Retardant is not harmful to the environment – Environmentally friendly materials are essential for a cleaner world, follow the link below to sustainable construction.

HR-Prof is simple to use and safe to apply. Possessing high diffusion properties it quickly penetrates the structure of the substrate. Unlike intumescent systems it does not require an additional protective finishing coat. However, if required HR-Prof can be over-coated with wood stains, varnishes and some paints (tests may be required before over-coating, click here to view Top Coats).

HR-Prof has non-flammable properties, which become part of the substrate, restricting ignition and the spread of flame. It will not wash out from the surface of the substrate after drying, it is not converted into smoke when exposed to high temperatures, and carbon char is restricted to the immediate area. Materials treated with HR-Prof when exposed to temperatures of up to 1700 C are subject to charcoal forming, severely restricting the spread of flame.

HR-Prof for use in timber frame buildings, external wood cladding, on staircases, trusses, doors, joists, floors and walls, on stables, log cabins, boats, fencing and garages – inside and outside. Once dry it is not affected by moisture so can also be used in kitchens, bathrooms, saunas and swimming pool enclosures. Timber pre-treated with HR PROF (Holz Prof) once dry does not react with galvanised steel ( zinc), stainless steel, brass, gun nails or zinc coated screws, whether the application is internal or external.

- Anti-fungicidal properties

– A very good fungicide

– Without colour or odour

– Non-toxic

– Solvent Free

– Not harmful to the environment

– For internal and external use

– Once dry it is not broken down by water or humidity

– Does not leach

Accelerated Weathering


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  

IMPORTANT FIRE PRODUCTS NOTICE: The information displayed on this website should be used as a guide ONLY and our Technical Department should be contacted to obtain a tailored specification and any advice necessary before you place an order for fire protection products. Fire protection products are non-returnable except in accordance with Terms and Conditions. We will not be held liable for any resulting damage to property, human life or monetary costs incurred due to the incorrect specification you have prepared or use of fire protection products caused by your negligence, including your failure to have contacted us to obtain the relevant advice/specification.

Product Performance

Testing Information

HR Prof Certificated Timber Species
BM TRADA Certification for Consistency of Performance of HR Prof on 18mm-8.5mm Spruce Cladding
SPRUCE: Euro-class “B-s1-d0″
PINE: Euro-class “B-s1-d0″
EUROPEAN OAK: Euro-class “B-s1-d0”
SCOTCH LARCH: Euro-class “B-s1-d0″ & BS 476 PART 6 & 7 UK Class “O”
SIBERIAN LARCH: Euro-class “B-s1-d0″
WESTERN RED CEDAR: Euro-class “B-s1-d0″
BIRCH PLYWOOD : Euro-class “C-s1-d1″
OAK FACED PLYWOOD: BS 476: PART 7: 1997 Class “2”
SUCUPIRA AMARELA Hardwood (density 1000kg/m3): Euro-class “B-s1-d0″
THERMOWOOD: Indicative result Euro-class “C”
Pine Flooring Radiant Panel 18mm, to EN ISO 9239-1:2002 Indicative Euro B-S1-d0
Fire Resistance classification K1 10
Fire Resistance classification K2 10
HR PROF (Holz Prof) development and manufacture approved to ISO 9001-2008

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