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Developments in wood preservation
1977 - IRG/WP 393
The purpose of this paper is to comment very briefly upon recent developments and trends in wood preservation so that members of this Working Group have a basic knowledge of activities in other countries. The last paper was prepared in April 1976 and the present paper refers to developments, since that time.
B A Richardson


New developments in wood preservation
1974 - IRG/WP 335
Most of the developments in wood preservation in recent years have been stimulated by changing circumstances, particularly the increasing interest in reducing hazards and environmental, pollution but also the serious difficulties that are now being encountered in obtaining economic supplies of established preservatives. There is perhaps a danger that new controls to reduce pollution dangers may be too severe.
B A Richardson


Chromium in wood preservation: Health and environmental aspects
1978 - IRG/WP 3120
The majority of water-borne salts in current use contain hexavalent chromium, usually as dichromate or chromium trioxide. In about 1913 it was suggested that chromates, phosphates or borates could be added to the sodium fluoride and dinitrophenol mixtures then in use in order to inhibit corrosion. Dichromates were found to be most suitable and the resulting mixture known as Thriolith and later Triolith, was the first of the group of wood preservative products that are now usually described as Wolman salts. Although the dichromate was originally introduced in order to reduce the corrosive properties of the dinitrophenol it was soon appreciated that it considerably improved fixation and the resistance of the treatment to leaching, and dichromate contents have been progressively increased since then in attempts to further improve fixation. Chromate and dichromate were similarly found to assist fixation of copper salts, and copper-chromium-arsenic salts now account for most of the chromium used in wood preservation. The permanence, distribution and influence on materials of chromium containing water-borne preservatives has previously been reviewed in a paper prepared for this Working Group III (Belford, 1970).
T R G Cox, B A Richardson