Korppi (Raven)
Korppi combines the rugged texture of a charred surface with the mystical beauty of a glossy blue tint. Interior use only.
Applications
Manufacturing
Korppi product is made by charring the wood surface at over 1000 °C using Hiil's charring technology. After charring, the product is quenched with water, dried and oiled with blue-tinted special linseed oil. The oil binds the char on the surface so that it does not dust or flake off.
Specifications
| Surface | Charred, oiled, tinted blue |
|---|---|
| Wood species | Pine, Kiertopuu® pine |
| Wood certification | PEFC certified |
| Planed thickness | 22, 28 mm Note! Charring reduces the thickness of the wood piece by 0-3 millimetres and rounds the edges. |
| Width | 120, 145, 170, 195 mm |
| Panel overlap | -12 mm from width |
| Profiles |   |
| Country of origin | Finland |
| CE marking | Product is CE marked |
| Fire class | D class C-class indicative. B-class with fire retardant indicative. |
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Weather exposure
Weather exposure test for Hiil Oy charred wood products
Natural Resources Institute Finland - 27 March 2025 results - Veikko Möttönen and Nina Pottonen.
Weather exposure test programme: 102 min UV exposure and 18 min UV+rain exposure, repeated over 6 weeks (1008 h). Equivalence: The treatment can be considered to correspond to approximately 3 years of outdoor exposure to rain and sunlight. UV radiation dose in the test was approximately 218 MJ/m².
Downloads
Find more on the Resources page.
Example projects using Korppi
Charred wood panelling for an Aufguss sauna
Ikaalisten Spa’s Aufguss sauna with Hiil Korppi – a charred surface with a blue sheen that shifts with the light.
TRIB3 Helsinki Sture, charred wood building the atmosphere
TRIB3 Sture boutique fitness studio with charred wood – Hiili and Korppi at reception, Kuura in the Pilates room. A shared, community-led atmosphere and a clear material language.