Castanea sativa
Sweet Chestnut
A lighter, softer cousin of oak. Tannin-rich heartwood gives it real durability outdoors, but those same tannins react with iron, so fixings need to be stainless or brass.
- Gojeno in posekano v Evropi.
- Botanična skupina. Iglavci so golosemenke, listavci pa širokolistna drevesa.
- Botanična družina, ki ji vrsta pripada.
Obvestite me ob prihoduReferenčna vrsta. Trenutno ni kosov na zalogi.
Je primeren za vaš projekt?
Odličen za
- External cladding and rainscreens
- Interior wall and ceiling panelling
- Barn-style and rustic furniture frames
- Garden furniture and pergolas
- Coopered tanks, vats, and planters
- Beams and exposed structural framing
V trenutni ponudbi ni lesa Sweet Chestnut
Podobne vrste na zalogi
Lesa Sweet Chestnut trenutno ni. Te vrste so primerne za enake projekte in imajo razpoložljive kose.
Prejemajte obvestila o lesu Sweet Chestnut
Pošljemo vam e-pošto, ko v KORENA prispejo novi plohi iz lesa Sweet Chestnut. Vsak kos je edinstven, zato je zgodnje obvestilo pomembno.
Videz lesa
Kako je videti
Straight-grained and coarse-textured, with prominent ring-porous figure that reads as oak at a glance. Heartwood is a warm honey-brown that ambers with age; sapwood is a narrow pale band. Lacks oak's strong medullary rays, so quartersawn faces are calmer and less flecked.
- Heartwood: warm honey to mid-brown, ambers with age
- Sapwood: narrow, pale cream to light straw
- Fumed: deep chocolate to near-black with ammonia
- Oiled: pulls warmer and slightly redder than oak
- Weathered outdoors: silver-grey patina within 1–2 seasons
- Straight grain, coarse texture; resembles oak.
Obdelava
Obdelava
Saws and planes well with sharp tooling. Softer than oak, so it dents more easily but is also kinder on edges. Splits readily when screwed near ends or edges, pre-drill and countersink. Glues and steam-bends predictably. Turning is workable but the coarse grain can tear on end-grain cuts.
Končna obdelava
Takes oil, hardwax, and water-based finishes cleanly. Open pores benefit from a grain filler if you want a glass-flat surface, or leave them open for a tactile, oak-like read. Fuming with ammonia darkens it deeply thanks to the high tannin content. Test stains on offcuts, tannins can pull cool tones grey.
Sušenje
Dries slowly and is prone to ring shake and honeycomb if pushed. Air-dry to around 25–30% MC before kilning, then run a gentle schedule. Movement in service is moderate, tangential shrinkage near 7% means wide boards want room to move in panels and tabletops.
Koliko bo deloval?
Les se prečno širi in krči, ko zrak postaja bolj vlažen ali suh. Pred načrtovanjem pritrdil ocenite sezonsko delovanje mizne plošče iz lesa Sweet Chestnut.
Pričakovano sezonsko delovanje
približno 7,7 mm
Mizno ploščo pritrdite s sponami ali nosilci z utori, ne z lepilom ali trdno privitimi vijaki.
Model linearnega krčenja: širina × (krčenje ÷ 28 % nasičenosti vlaken) × sezonska sprememba vlažnosti. Za les Sweet Chestnut uporablja 6,75 % tangencialnega krčenja. To je ocena za načrtovanje, ne jamstvo.
Koliko stane
Varnost in nabava
- Gojeno in posekano v Evropi.
- Status na Rdečem seznamu IUCN: svetovna ocena ogroženosti te vrste.
Dust is a reported skin and respiratory sensitiser, extract at source and wear a fitted mask when sanding or routing. Heartwood is rated food-contact safe once finished. Critical detail: chestnut tannins react with iron and produce black staining wherever the two meet in the presence of moisture. Use stainless steel or brass fixings, and keep iron tooling off damp stock.
Preberite celoten vodnikPodrobni zapiski o teksturi, spreminjanju barve, obdelavi in stabilnosti.
What Sweet Chestnut actually is#
Castanea sativa is often sold as the light alternative to oak, and for appearance and durability that description holds. It is ring porous with a similar grain pattern, it carries a similar warm brown colour, and at decay class 2 it is genuinely durable outdoors.
Where the comparison breaks down is hardness. At 3,010 N Janka chestnut is the softest hardwood in this catalogue apart from black poplar, softer than Scots Pine and less than two thirds as hard as oak. Anyone expecting oak-like wear resistance from an oak-like appearance will be disappointed.
The other difference is visible: chestnut lacks oak's prominent rays, so a quartersawn chestnut board shows no ray fleck.
Ring shake, which is the thing to inspect for#
Chestnut is notably prone to ring shake, a separation along a growth ring inside the log.
The problem is that it frequently does not show on a rough sawn face. A board looks sound, gets machined, and the shake opens into a crescent shaped split that follows the ring and effectively ruins it.
This is the main reason chestnut yields far less usable timber than the abundance of the tree suggests, and it is the main reason to look carefully rather than quickly at a chestnut slab. Check end grain for any ring separation, and look along the length in raking light for a crescent line.
Vprašanja kupcev
Vprašanja kupcev
How is Sweet Chestnut different from oak?
It looks similar and is durable like oak, but it is much lighter and softer at 590 kg per cubic metre and 3,010 N Janka against 675 and 4,980 for European oak. Chestnut also lacks the prominent rays, so it has no ray fleck on quartersawn faces. It is often described as oak without the weight, which is fair for appearance and durability but not for hardness.
What is ring shake and why does it matter in chestnut?
A separation along a growth ring inside the log, which chestnut is particularly prone to. It may be invisible on a rough sawn surface and open up after machining, effectively ruining a board. It is the main reason chestnut yields less usable timber than its abundance suggests, and the main thing to inspect for when buying.
Can it be used outdoors?
Yes. At decay class 2 it is durable, and its high tannin content gives real resistance to rot. Chestnut has been the traditional European timber for fencing, cladding, shingles and outdoor structures for centuries, and coppiced chestnut fence posts are still a standard product.
Does it stain black like oak?
Mehanske lastnosti
Tehnični podatki
Objavljene referenčne vrednosti. Kjer se viri ne ujemajo, je prikazan razpon, za zgornje lestvice pa je uporabljena običajna vrednost.
| Gostota (kg/m³)Masa na kubični meter pri približno 12 % vlažnosti. Težji les je navadno trši in močnejši. | 540–650 kg/m³običajno 590 kg/m³ |
|---|---|
| Trdota po Janki (N)Sila, potrebna, da se jeklena kroglica do polovice vtisne v les. Standardno merilo odpornosti proti udrtinam. | 2,700–3,300 Nobičajno 3010 N |
| MOR: upogibna trdnost (MPa)Upogibna trdnost: obremenitev, pri kateri se nosilec zlomi. | 70–85 MPa |
| MOE: modul elastičnosti (GPa)Upogibna togost: koliko se polica ali mizna plošča povesi pod obremenitvijo. | 8.0–10.0 GPa |
| Radialno krčenjeKrčenje prečno na letnice od svežega do popolnoma suhega lesa. Tako delujejo radialno rezane deske. | 3.5–4.5 % |
| Tangencialno krčenje |
