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about tmt


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about tmt


What is TMT

Thermally modified timber goes through a 3-stage kiln process which uses high temperature. It takes 24-72 hours to complete a full cycle. During the high temperature phase, the wood is protected from combustion by using steam. In that time, the moisture of the wood is almost completely removed and added back to a precise amount. The natural acids and sugars are modified from the extreme heat which changes the physical structure of the wood. The wood’s ability to absorb moisture is declined making it less prone to rot and decay. The equilibrium moisture content (EMC) of the wood decreases. This means the swelling and shrinking of the wood material due to moisture variations can be reduced by up to 60% as compared to unmodified wood. The most apparent change is that the wood darkens throughout, giving domestic wood the look of desirable imported wood.

The 3-phase process uses only heat and water to change a wood species ability to withstand the elements, making it one of the most natural, chemical free ways to extend the life of wood products.

Phase 1


Temperature Increase
The temperature in the kiln is raised rapidly to around 100˚C (212˚F), affecting the natural composition of the wood. Steam is introduced to prevent the wood from checking in the high heat. The moisture content of the wood is reduced from 15-20% down to nearly zero.

phase 2


Thermal Modification
One peak temperature is resulting in a light cook, 190˚C (374˚F), and the other is the dark cook at 210˚C (415˚F). The higher and longer the heat, the darker the wood becomes throughout. At these high temperatures, the lack of oxygen within the chamber is what prevents the wood from burning.

phase 3


Cooling & Re-Conditioning
Temperature is reduced by introducing steam. The steam cools and conditions the wood to a moisture content of 4-6% improving dimensional stability.

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color change


color change


color change

The color of wood will darken in tone through the thermal modification process. It is important to understand that it is a natural product and the grain, original color variances and characteristics of the wood still are present. The wood is darkened throughout so any sanding or refinishing will bring the wood back to the original color without staining. In an exterior environment TMT products do move to gray when unfinished. Finishes with UV inhibitiors help slow this process similar to non-modified products. The color change of the thermally modified wood is especially useful in the flooring industry since it can be used to emulate tropical wood species

 Light Ash : Oil Finish

Light Ash : Oil Finish

 Light Ash : Raw

Light Ash : Raw

 Light Ash : Aged No Finish

Light Ash : Aged No Finish


properties

  • Dimensional stability is increased, minimal expansion and contraction
  • Enhanced appearance: darker, through-color and more even tone throughout
  • Increased exterior performance: less water absorption and less susceptible to rot
  • Able to be glued, painted, finished
  • Milling and workability similar to standard wood
  • Lightweight
  • Process is chemical free, only heat and steam are used
  • Is a value-added, new application for domestic wood
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when and where


when and where


When to use Thermally Modified Wood

AWCo products are an excellent natural option for interior and exterior wood applications. Thermally Modified Timber (TMT) is suited for siding, flooring, decking, window and door manufacturing and much more. TMT material has limited expansion/contraction and can have stains and paints applied like standard wood products. 

  • MADE IN USA: AWCo products are domestically sourced and harvested in the United States.
  • INTERIOR & EXTERIOR GRADE: TMT is suitable for both interior and exterior applications.

Where to use Thermally modified wood

Thermally modified wood can be used in an array of commercial and residential applications. Popular applications are in external environments where moisture and humidity would compromise a lesser-grade material.

  • DECKING 
  • DOCKING
  • SIDING
  • INTERIOR FLOORING: The color change of the thermally modified wood is especially useful in the flooring industry since it can be used to emulate tropical wood species.
  • WINDOWS
  • DOORS
  • BATHROOM INTERIORS
  • SAUNAS

Improved aesthetics and durability are met with AWCo Thermally Modified Timber. Our material can be used in place of more expensive tropical wood species and is a domestic, environmentally conscious option.

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why


why


SUSTAINABILITY

AWCo is a premier choice for sustainably harvested thermally modified timber. 

 

  • DOMESTIC: AWCo is based in Duluth, Minnesota. We work with our domestic partners to offer our clients uncompromised quality in harvest, modification and millwork.
  • CHEMICAL FREE: Thermally modified wood is an alternative to exotic woods and standard-treated woods. It attains superior exterior qualities without the use of toxic chemicals.

Stability

After the wood has been thermally modified its properties are more stable than standard kiln dried wood. The swelling and shrinking of wood due to moisture variations can be reduced by up to 60%.

 

  • DECAY RESISTANT: The risk of fungal attack is greatly reduced because thermally modified wood no longer contains sufficient nutrients.
  • INCREASED DIMENSIONAL STABILITY: Thermally modified wood is less susceptible to cupping and warping with changes in relative humidity.
  • ENHANCED APPEARANCE: Thermally modified wood will have darker through color tones. Color will vary with cook temperatures and species. Like standard wood, thermally modified wood, if left untreated, will turn a weathered gray color over time.