Fixation is an abstract and non-defined process. Nevertheless it is a specified requirement in most impregnation standards. The impregnation industry is facing increased pressure to deliver fixed products and to increase the safety of the handling of impregnated products. Industrial fixation of impregnated wood can be obtained by using different methods. The purpose of the process is to transform hexavalent chromium to the trivalent stage, where also arsenic and copper compounds are fixed. Through laboratory and practical tests A/S The Danish Wood Treating Co.Ltd (DWT) has developed an accelerated industrial fixation system. The system has been developped for accelerated fixation of chromium based wood preservatives in Pinus sylvestris. To satisfy the requirement of avoiding dripping outside the impregnation plant and hence the possibility of soil contamination, the process has been accomodated to provide a surface dry and non-dripping product at the end of the cycle. To support the process and to set the results in perspective a simple method of establishing the degree of fixation has been developped.

Download document (842 kb)
free for the members of IRG. Available if purchased.

Purchase this document