Due to increasing market shares of thermally modified timber (TMT) in Europe, a working group of ten central European TMT manufacturers (TMT-WG) was founded in 2010 to cover public relations and marketing activities. Since the present level of product testing and property declaration was not satisfying, a “task group TMT-quality” was put into action in 2010 to develop a comprehensive quality assurance concept (QA). This QA was approved by the TMT-WG in 2011. Consequently an incorporated association for TMT quality (“Thermoholz-Qualität e.V.”) was founded in February 2011 as a legal entity, responsible for granting the certification of quality of TMT after inspection and proposition by an independent third party quality committee. The criteria of the QA as well as rules and conditions for granting are described in this paper.

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