Photography NINA Trondheim © Angell Foto
Kebony recommended for windows
The hurdle for establishing new woods in the window industry is extremely high but Kebony, the sustainable alternative to tropical hardwood, has overcome this obstacle and is now officially recommended by the Verband Fenster + Fassade (German Association of Windows and Facades, VFF).
For years Kebony has been used across the world in window installations. Now, following research and exhaustive testing by Menck Fenster in Hamburg, which recommended Kebony as a suitable product for the window industry, the wood has been recognised by the Institute for Window Technology in Rosenheim. The timber concedes with VFF’s recommendations, meets the requirements of the leaflet HO.06-4 and is suitable for gluing and coating.
Kebony is not a new wood species per se, but it is a relatively new wood product for the window industry. The Kebony technology is an environmentally friendly patented process, which enhances the properties of sustainably sourced softwood species by impregnating them with bio-based liquid furfuryl alcohol, a byproduct of agriculture. This process permanently modifies the cell walls giving Kebony premium hardwood characteristics, bypassing the need for tropical hardwood and creating a product that is sustainable, durable and cost effective.
The Kebony technology gives the wood technical qualities that are significantly higher than those of untreated pine wood. The bio-alcohol links penetrates the wood to reduce the absorption of moisture and keeps the equilibrium moisture content below 7 % under standard conditions (20°C, 65 % rel. humidity).
Capillary water absorption is reduced to one tenth of the value for untreated wood and the maximum swelling from dry to saturation is reduced from 8 % (untreated wood) to 4 % (Kebony). In addition, as a side effect of increased stability, Kebony’s durability improves significantly, reaching durability class 1.
Danish companies Krone Vinduer and Kastrup sell Kebony windows, Norwegian manufacturer Førre supplies Kebony windows for Norway and NOKA provides Kebony windows to the German market, just to name a few examples of proven successful window suppliers across Europe.