The aim of the study was to determine physico-mechanical properties of OSB subjected to the boiling test. The tests were conducted on OSB/3 and OSB/4 of 12, 15 and 22 mm in thickness, produced in the years 2002 and 2009. All tested boards were resinated in the core layers with PMDI, while in the face layers MUPF was applied. It results from the tests that OSB/3 of 15 mm in thickness and OSB/4 exhibit very high resistance to the boiling test and their high initial physico-mechanical parameters make it possible to satisfy the respective standards also after the test.

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