--- title: Thermally Modified Wood - Thermal Modification | Jartek description: Explore the benefits of thermally modified wood, offering durability, stability, and aesthetic versatility for various applications, all without chemical preservatives. image: https://www.jartek.com/hubfs/website/featured-image.png --- # Thermally Modified Wood --- Naturally enhanced wood with improved durability, stability, and appearance Thermally Modified Wood (TMW) is wood that has been heat-treated in a controlled, low-oxygen environment to improve its durability, dimensional stability, and resistance to biological decay. No chemicals are introduced during the process.  Modern high quality thermally modified wood TMW is produced by International Thermowood Associations’s (ITWA) certified process, ThermoWood®. ThermoWood® products are produced under the independent quality control system audited by accredited notified body. Licensed members of ITWA can use the registered trademark for their products. ThermoWood® is a wood material produced by using natural methods, heat and steam. Thermal modification improves the wood’s technical properties and ThermoWood® is non-toxic, dimensionally stable, resistant to decay and resin free. It can be used inside or outdoors, in any climate.  Modern production process with constant innovation allows customization and tailored recipes for any wood species. With technology partners like Jartek there is always a fit to your need what comes to suitable thermal wood modification solution. Jartek is a kiln manufacturer member of ITWA. ![ITWA_TMT_ThermoWood_R](https://www.jartek.com/hs-fs/hubfs/ITWA_TMT_ThermoWood_R.jpg?width=945&height=945&name=ITWA_TMT_ThermoWood_R.jpg) Proof of quality. ThermoWood® is a patented production process and a registered trademark, that may only be used by licensed producer members of International ThermoWood Association (ITWA). These producers, their products and operations are monitored annually by a third-party auditor. Premium quality TMW products carry the ThermoWood® trademark. [ Download guide ](https://cta-service-cms2.hubspot.com/web-interactives/public/v1/track/click?encryptedPayload=AVxigLKC1Hqaa4z5OWCx3fKpxyI8cvd8%2FU82TgQcm36iBR2YmDZciqI6iUc4US25iqRgKAw%2FjueApOEfspR8QFIXAU05kNsYXRabRXx4QhL%2FHmMwZPhd88yoVWcmaO%2BCS44O07lduJoek0jsnfoBu5PB8T4Xh7DXnB7tpBMr6ORBdEkeJHWH8QRjEB%2BjFfzw0LqbQxnisJbDfQ39Dbaqadb8n4ptKJP0PVW5D8zwtnEsackUNBr0QQZ7v%2FZDhrZd&portalId=48911540) ## Benefits of TMW --- TMW made by ThermoWood® process has excellent durability and stability properties. It is dimensionally stable with reduced swelling and shrinkage with improved resistance to decay and moisture. Also, it is resin-free material with consistent color throughout the wood. With reduced thermal conductivity, ideal for cladding, saunas, and outdoor structures. Suitable for use in varying and demanding climate conditions. ![Thermally Modified Wood](https://www.jartek.com/hs-fs/hubfs/Thermally%20Modified%20Wood.jpg?width=2101&height=2101&name=Thermally%20Modified%20Wood.jpg) - ### Durability TMW is resistant to demanding weather conditions. It is through colored and can have decades long service life. - ### Dimensional stability The wood structure is modified during the TMW process, reducing the risk of warping, cupping, cracking, swelling, and shrinkage. - ### Biological Resistance Wood chemical structure is change so that there is no nutrients for fungi or insects. TMW is thus resistant to rot, decay, mold , and pests. - ### Aesthetic versatility TMW is through colored and comes in various color schemes from light to dark brown. It ages beautifully to shades of gray. - ### Interior and exterior applications Only sky is the limit in applications of TMW. The most common ones are decking, cladding, facades, paneling, flooring, furniture and joinery work ## Key features --- Features that make TMW a multi-use, sustainable alternative to chemically treated wood e.g. pressure impregnated wood and tropical hard wood are results of a proper modern manufacturing process compliant with ITWA’s ThermoWood® process. Features range from aesthetic to chemical, and physical ones resulting in multiple end use benefits. ![Thermally_Modified_Wood](https://www.jartek.com/hs-fs/hubfs/Thermally_Modified_Wood.jpg?width=4900&height=3267&name=Thermally_Modified_Wood.jpg) - ### Low Equilibrium Moisture Content Low EMC means reduced swelling and shrinkage, and resistance to fungi. - ### No added chemicals TMW is non-toxic, sustainable, fully recyclable, and safe. - ### Through colored TMW can be sanded, planed, and worked without losing its color - ### Modified molecular structure For dimensional stability, and resistance to biological degradation. - ![arborwood_ash_exterior](https://www.jartek.com/hs-fs/hubfs/arborwood_ash_exterior.webp?width=1600&height=900&name=arborwood_ash_exterior.webp)  Image Courtesy of Arbor Wood Co.  - ![Jartek x Aurum_Lunawood ThermoWood_CMYK](https://www.jartek.com/hs-fs/hubfs/Jartek%20x%20Aurum_Lunawood%20ThermoWood_CMYK.jpg?width=6720&height=4480&name=Jartek%20x%20Aurum_Lunawood%20ThermoWood_CMYK.jpg) Project Ö Architect: Aleksi Hautamäki Photo: ©Lunawood Products: Luna Panel System and Lunawood Decking - ![novavood03](https://www.jartek.com/hs-fs/hubfs/novavood03.jpg?width=5721&height=3804&name=novavood03.jpg) Novawood © ZM YASA Architectural Photography  - ![novawood](https://www.jartek.com/hs-fs/hubfs/novawood.webp?width=1600&height=900&name=novawood.webp) Novawood © - ![Project Ö_Archipelago_cabin_Thermowood facade_and_decking](https://www.jartek.com/hs-fs/hubfs/Project%20%C3%96_Archipelago_cabin_Thermowood%20facade_and_decking.jpg?width=4961&height=3307&name=Project%20%C3%96_Archipelago_cabin_Thermowood%20facade_and_decking.jpg) AURUM Architect: ARGO Photo: WelluHämäläinen  ©Lunawood Product: Lunawood Battens - ![froslev_playground](https://www.jartek.com/hs-fs/hubfs/froslev_playground.webp?width=1600&height=900&name=froslev_playground.webp) Frøslev Træ A/S. © - ![Thermo-aspen-sauna_Photos-Karl-Kasepold-9](https://www.jartek.com/hubfs/Thermo-aspen-sauna_Photos-Karl-Kasepold-9.avif) Thermory thermo-aspen Rombto wall panels  Thermory thermo-aspen 28x42 bench boards Photos: Karl Kasepõld  - ![arborwood_ash_interior](https://www.jartek.com/hs-fs/hubfs/arborwood_ash_interior.webp?width=1600&height=900&name=arborwood_ash_interior.webp)  Image Courtesy of Arbor Wood Co. - ![froslev_cladding](https://www.jartek.com/hs-fs/hubfs/froslev_cladding.webp?width=1600&height=900&name=froslev_cladding.webp) Frøslev Træ A/S. © ## How to make TMW? --- ![Thermal_Modification_Chamber](https://www.jartek.com/hs-fs/hubfs/Thermal_Modification_Chamber.jpg?width=3840&height=2160&name=Thermal_Modification_Chamber.jpg) ### Thermowood Process Thermal modification technology from Jartek is fully compatible with ThermoWood® process. All you need is steam and heat to make premium quality TMW.   [Read More › ](https://www.jartek.com/thermal-modification/thermowood-process?hsLang=en) ![Thermal_Modification_kilns](https://www.jartek.com/hs-fs/hubfs/Thermal_Modification_kilns.jpg?width=4032&height=3024&name=Thermal_Modification_kilns.jpg) ### Thermal Modification Kilns Robust, sturdy, digitalized, high quality, proven kilns for industrial thermal wood modification are engineered for precision, durability, and energy efficiency for any batch size 3-130 m³ (8500-55000 BF).  [Read more › ](https://www.jartek.com/thermal-modification/kilns?hsLang=en) ## Let's talk about your next project. --- Let's build something that lasts. Whether you're looking for a new production solution, service support or a career that shapes the future of the wood industry – Jartek is ready to connect. [Contact sales › ](https://www.jartek.com/contact/#contact-us) ### STAY AHEAD WITH Jartek Subscribe to our newsletter for fresh insights and the latest industrial innovations.