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Brimstone Poplar

Brimstone Poplar Cladding VHL6Thermally Modified Poplar Cladding

Brimstone poplar | VHL6 Thermally modified poplar cladding

Large volumes of hybrid poplar were originally planted to supply the Bryant and May match factories and pulp mills, but unfortunately, by the early 80’s production of both drew to an end. The specie, is however, very efficient at absorbing large volumes of water and Co2, features which make it very useful in the current environmental context. Unfortunately without a value, it unlikely that the specie will be replanted for future generations.

Thermal modification once again gives a commercial value to this tremendous tree. By curing two of its greatest faults, instability and liability to rot, Brimstone Poplar will behave and last outside without any treatment.

Brimstone Poplar is produced from the clean butt of the tree where the wood is straight grained and relatively knot free. The appearance is silky and the colouring is a medium chocolate brown (think 50% cocoa).

Being the softest of the three Brimstone products, poplar is not suitable for decking and may not be suitable for all joinery and furniture applications. However, Brimstone Poplar is the cheapest of the three options and is cheaper than Canadian cedar, oak and sweet chestnut, making it a great choice for contemporary cladding installations.

When designing joinery and furniture remember the product is more brittle than natural wood and may require different jointing and gluing techniques.

Like all thermally modified timber, Brimstone is durable above ground but it will not last well when in contact with the ground.


Technical Specification

Produced to comply with the harmonised standard for construction products regulation BSEN14915:2013 and to conform with BS8605-1:2014 External timber cladding: Method for specifying.

Trade Name Brimstone Poplar
Base timber English poplar
Species Populus (Hybrid)
Process Thermal modification. 210 degrees centigrade.
Origin Legal and well-managed forests in England and Wales.
Intended use External cladding
Other uses External joinery and furniture
Appearance Consistent dark chocolate brown colouring with a silky grain pattern and regular birds eye pips. The colour is further enhanced by the application of a clear oil such as Osmo UV resistant oil.
Weathering The modification process removes most natural extractives resulting in relatively consistent weathering largely free of staining. Weathering to a grey colour occurs more quickly than on non-modified timber. When wet Brimstone poplar returns to a walnut colour.
Profiles All machined profiles
Dimensions 20 x 70mm, 20 x 95mm, 20 x 145mm
Lengths Random. 1.5 – 3.0mt+
Moisture content 2-4% (Moisture content is stable in exterior conditions)
Natural durability (EN350-2) Very durable. Class 1
Insect attack Thermally modified wood is resistant to insect attack when used above ground contact.
Desired service life (BS8417) Occasionally wet 60 yrs
Frequently wet 30 yrs
Treatability class Resistant
Movement class* Small (Negligible)
Resistance to impact* Low
Resistance to fixing High. Modified wood is brittle and should be treated with care.
When to fix Year round. Very stable in all conditions.
Grading BS1186-3 1990 Class 1. EN942:2007. J20. CE grade A. Clean with a few small sound knots.
Working properties Thermally modified woods are more brittle than untreated wood. Care should be taken when cutting and nailing to prevent chipping and break out. Pre-drilling is advised. Test glues before large-scale use. Water based glues do not work well. PU glues have tested well. Otherwise treat as a normal hardwood.
Extractives The modification process involves no chemicals and any natural chemicals in the wood are removed during the process. Thermally modified wood can be treated as inert.
Emission of formaldehyde (EN14915) E1 (Not significant)
Reaction to fire (EN14915) Euroclass F (Untested). D-s2, d0
Fire treatment Untested
CE compliant Yes

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