In 1962 a stake test was started with ammoniacal copper in combination with chromium, arsenic, pentachlorophenol, boron, salicylic acid, benzoic acid, sorbic acid, pyridine and tannin. Different concentrations of the copper component were used as well as the added agents. For each concentration and test site, ten stakes of Pinus sylvestris L. sapwood were treated. The stakes were set out at two test fields in Sweden, Simlångsdalen and Bogesund and also in a greenhouse. Today all stakes except five at Bogesund have been rejected. The prevailing type of decay in Bogesund is soft rot and in Simlångsdalen brown rot and soft rot. Ammoniacal copper alone at a copper retention of 1.9 kg/m3 gave an average service life of 23 years in Bogesund and 14 years in Simlångsdalen. When the copper retention was doubled to 3.8 kg/m3 the service lives were prolonged by 2-3 years in Bogesund and 8-9 years in Simlångsdalen. Most of the agents added to copper prolonged the service lives substantially in Simlångsdalen but only marginally, or not at all in Bogesund. The added agents which gave the longest service lives at both test fields were chromium plus arsenic and pentachlorophenol.

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