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Influence of sampling on the composition of test solutions
1985 - IRG/WP 2235
For four commercial products of CCB-salts the influence of the kind of sampling on the composition of test solutions has been tested. For each product several 5 g samples have been taken at random, after careful mixing the content of each bottle, and after grinding the whole content. With each sample a 5% test solution was made and analyzed on the content of chromium, copper and boron. Altogether 111 solutions were investigated. The results demonstrate, that an at random sampling gives large variations in the composition of the various test solutions and only a grinding of the whole content of a bottle to a fine powdered product ensures a constant composition of test solutions.
H Willeitner, K Brandt


Environmental safeness of 60% and 72% concentrated CCA-C solution and paste for wood treatment
2012 - IRG/WP 12-50284
In this study 30-years practical and observational experience of the present author about using of 72% concentrated CCA-C paste for preparing treating solutions and for treating wooden poles, anchor logs and cross arms has revealed that the 60% concentrated CCA-C solution is superior to the 72% concentrated CCA-C paste regarding solubility, homogeneity, cleanliness, treatability, sludge formation, problems of plant operators. Often certain percentage (1% to 2%) of 72% concentrated CCA-C paste cannot be dissolved in water and remain in solution as suspended minute particles that helps formation of sludge on treated products and at the bottom layer of reserve tanks. Therefore, 60% concentrated CCA-C solution has been found to be environmentally and economically safer than 72% concentrated CCA-C paste and has been recommended to use 50% to 60% concentrated CCA-C solution stopping using problematic 72% concentrated CCA-C paste as a source of treating solution.
A K Lahiry