Kaarna+ (Bark+)
Kaarna+ is a charred and brushed wood product treated with dark brown pigment. Thanks to the pigment, it does not grey as much as untreated Kaarna.
Applications
Manufacturing
Kaarna+ product is made by charring the wood surface at over 1000 °C using Hiil's charring technology. After charring, the product is pressure-washed with water, dried, brushed and oiled with brown-tinted special linseed oil. The oil binds the char on the surface so that it does not dust or flake off.
Specifications
| Surface | Charred, washed, brushed, tinted brown, oiled |
|---|---|
| Wood species | Pine, Kiertopuu® pine |
| Wood certification | PEFC certified |
| Planed thickness | 22, 28, 45 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 B-class when treated with fire retardant, spruce as material. |
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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.