In 1995 an extensive field test program with wood mini-stakes, 8 x 20 x 200 mm, was started. In these trials a large number of parameters are being evaluated, including several new wood preservatives, differently chemically modified woods and natural durability of various wood species. The test sites are three fields in Sweden for in-ground and “close to ground” testing, one subterranean termite field in Indonesia for in ground testing, and finally one fungus cellar. The results of the test program show that some chemically modified woods perform surprisingly well and actually equal to or better than CCA-impregnated wood. This was also true for wood treated with some of the new preservatives included in the program. After more than six years of testing it is clear that the in-ground test results are comparable with ordinary EN 252 results with full sized stakes, 25 x 50 x 500 mm. Mini-stake EN 252 field testing is thereby an economic alternative to ordinary EN252, if the intention is to screen many parameters with a limited amount of material and with limited field space available.

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