In 1979 a number of glued laminated poles treated with CCA and creosote were placed in a greenhouse at Uppsala, at the Simlångsdalen test field in southern Sweden and under a power line in Vuollerim in northern Sweden in order to study their resistance against biological degradation. The tests have shown that the best performance will be obtained if each laminate is first treated with a water-borne preservative (only CCA was used in this test) and thereafter the laminated pole treated with creosote. Of the 16 creosoted poles in Simlångsdalen and Vuollerim, 13 poles are still free from decay in the sapwood and 3 poles show slight decay. In the heartwood of outer laminates, slight decay was observed in 11 poles.

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