Populus nigra
Choupo-negro
The lightest hardwood KORENA lists, and the one most often blamed for a fault that belongs to the blade.
- This species is recorded as commercially grown in Europe. This does not establish where an individual piece was harvested; check its origin details.
- Grupo botânico. As madeiras de coníferas vêm de coníferas; as folhosas vêm de árvores de folha larga.
- Família botânica a que pertence a espécie.
Receber aviso quando chegarEspécie de referência. Sem peças em stock neste momento.
É adequada ao seu projeto?
Ótima para
- Painted furniture
- Drawer sides and carcass interiors
- Lightweight panels
- Sculpture and carving blanks
- Plywood core
Sem Choupo-negro na seleção atual
Espécies semelhantes em stock
Não há Choupo-negro neste momento. Estas espécies servem para os mesmos projetos e têm peças disponíveis.
Receba notificações sobre Choupo-negro
Enviamos um e-mail quando chegam à KORENA novas pranchas de Choupo-negro. Cada peça é única, por isso é importante saber cedo.
Aspeto da madeira
Qual é o seu aspeto
Very pale, creamy white to light grey brown, sometimes with a faint greenish cast in the heartwood, and almost no figure. The texture is fine and even but the wood is notably soft and light at 385 kg per cubic metre, the lightest hardwood KORENA lists. It has a woolly quality under a dull blade that gives it an undeserved reputation for being difficult.
- Creamy white to light grey brown
- Occasional faint greenish cast in the heartwood
- Fine even texture with very little figure
- Fibra direita, textura fina e uniforme, com muito pouca figura. De branco-creme a castanho-acinzentado claro, ocasionalmente com um ligeiro tom esverdeado no cerne.
Trabalhar esta madeira
Como se trabalha
Easy to work with hand and machine tools, with one specific requirement: sharp cutters are necessary when planing to avoid fuzzy surfaces. This is the whole difficulty with poplar. The fibres are long and soft, and a dull blade drags rather than severs them, leaving a woolly face that sanding only makes worse. With a keen edge and a light cut it machines cleanly. It glues well and takes fastenings adequately for its density.
Acabamento
Its natural role is under paint, and it takes paint very well given the fine even texture and absence of resin. Under a clear finish the pale colour with its occasional greenish cast is unusual rather than attractive to most eyes. Pigment stains blotch, so use a conditioner or a dye. Because the wood is soft, a hardwax oil or a film finish adds useful surface protection.
Secagem
Dries readily and without much degrade, and it is dimensionally reasonable once dry, with volumetric shrinkage of 12.3 percent. The tangential to radial ratio of 9.3 against 4.0 percent is wide, so flatsawn boards will cup. Wet poplar is notably heavy and can carry very high green moisture content, so drying takes longer than the modest final density suggests.
Quanto se irá mover?
A madeira incha e contrai-se na largura à medida que o ar fica mais húmido ou mais seco. Estime o movimento sazonal de um tampo de Choupo-negro antes de desenhar as fixações.
Movimento sazonal previsto
cerca de 10,6 mm
Fixe o tampo com fixadores ou suportes com rasgos, não com cola ou parafusos apertados.
Modelo de retração linear: largura × (retração ÷ 28 % de saturação das fibras) × variação sazonal da humidade. Usa uma retração tangencial de 9,3 % para Choupo-negro. É uma estimativa de planeamento, não uma garantia.
Quanto custa
Segurança e origem
- This species is recorded as commercially grown in Europe. This does not establish where an individual piece was harvested; check its origin details.
Besides the standard health risks associated with any wood dust, no further health reactions are associated with Black Poplar in the source cited here. It is among the less irritating woods in this catalogue to machine.
Populus nigra is a floodplain tree, native along river systems across Europe, North Africa and western Asia. Its natural riverside habitat has been heavily reduced by flood control and river engineering, and the wild population is now one of the more threatened tree populations in Europe, though hybrid poplars planted for timber are abundant and unrelated to that concern.
Ler o guia completoNotas detalhadas sobre desenho, alteração da cor, trabalho e estabilidade.
What Black Poplar actually is#
Populus nigra is a floodplain tree. Its natural home is the riverbank, across Europe, North Africa and western Asia, in the shifting wet ground that flood control and river engineering have largely eliminated over the last century.
That has produced an unusual situation. The wild population of Black Poplar is one of the more threatened tree populations in Europe and the subject of active restoration work, while poplar timber itself is cheap and abundant, because the commercial trade runs largely on planted hybrid poplars. The two facts sit oddly together and are worth keeping separate when you read about the species.
The fuzzy surface problem, which is not the wood's fault#
Poplar has a reputation for machining badly. It plane fuzzy, people say, and the surface goes woolly no matter what you do.
The cited source puts it precisely: sharp cutters are necessary when planing to avoid fuzzy surfaces. That is the entire difficulty.
Poplar fibres are long and soft. A blade with any dullness at all drags them instead of severing them, and they lift into a woolly nap. Sanding the result makes it worse, because abrasive tears more fibre rather than cutting it. So the maker sands harder, gets a worse surface, and concludes the wood is the problem.
With a freshly honed iron, a tight mouth and a light cut, poplar machines perfectly cleanly. A card scraper produces an excellent final surface. This is a wood that is unusually honest about the state of your tooling.
Perguntas dos compradores
Perguntas dos compradores
Why does poplar go fuzzy when I plane it?
The fibres are long and soft, so a dull blade drags them rather than cutting them, leaving a woolly surface. Sanding makes it worse by tearing more fibre. The fix is a freshly honed iron, a tight mouth and a light cut, or a card scraper for the final surface. With a sharp edge poplar machines perfectly cleanly, and its reputation for being difficult is really a reputation for punishing blunt tools.
Is it strong enough to build with?
For its weight, yes, but it is the softest and lightest hardwood in this catalogue at 385 kg per cubic metre and 2,020 N Janka, softer than Scots Pine. It suits drawer sides, carcass interiors, lightweight panels and anything that will be painted. It is not a work surface and it is not a structural timber.
Is Black Poplar endangered?
The wild riverside population is genuinely threatened across Europe, having declined severely through flood control and river engineering, and it is the subject of active restoration programmes. The commercial timber trade is largely supplied by abundant hybrid poplars, which are a separate matter. It is not CITES listed and the cited source reports no IUCN assessment. Provenance is worth checking more carefully here than for most European species.
Propriedades mecânicas
Dados técnicos
Valores de referência publicados. Quando as fontes divergem, é apresentado o intervalo e o valor típico é usado nas escalas acima.
| Densidade (kg/m³)Massa por metro cúbico com cerca de 12 % de humidade. A madeira mais pesada costuma ser mais dura e resistente. | 385 kg/m³ |
|---|---|
| Dureza Janka (N)Força necessária para pressionar uma esfera de aço até metade da sua profundidade na madeira. É a medida habitual de resistência a mossas. | 2,020 N |
| MOR: módulo de rutura (MPa)Resistência à flexão: a carga com que uma viga parte. | 64 MPa |
| MOE: módulo de elasticidade (GPa)Rigidez à flexão: quanto uma prateleira ou um tampo flete sob carga. | 7.2 GPa |
| Retração radialRetração perpendicular aos anéis de crescimento, do estado verde à secagem em estufa. É este o movimento das tábuas de corte radial. | 4.0 % |
| Retração tangencialRetração ao longo dos anéis de crescimento. É este o movimento das tábuas de corte tangencial e da maioria das pranchas. |
