After the leaching test, the wood undergoes the supplementary test EN 113, where the protective effect is measured against different rot fungi. EN 113 assumes that the wood is subjected to a complete fungal attack. Sioo:x treated and untreated wood specimens were exposed to a white rot fungus (Trametes versicolor) and two brown rot fungi (Gloeophyllum trabeum and Poria placenta). All three species are common and cause rot in wood. The difference between them is that the white rot fungus lives in the ground while the brown rot fungi also thrive and cause damage above ground.
The result is visible to the naked eye: Visually the testing showed that the Sioo:x treated wood samples could withstand fungal attack, while the untreated wood sample was overgrown with rot fungus. Weight loss analysis confirmed this assessment: to pass the tests EN 84 and EN 113, the treated test sample must not lose more than 3% of its weight during the test period.
The weight loss is due to the rot fungi breaking down wood substances and consuming them as nutrients. The results showed that the Sioo:x treated samples resisted the rot fungi very well. The weight loss was less than 3% for fungi found above ground, so-called brown rot, (compared to untreated wood samples which lost between 25% and 40% of their weight).
The good results in the EN 113 tests together with results from other tests, efficacy assessments and long practical experience mean that the products qualify for use for the protection of wood above ground according to the standard EN 335-2 if the instructions that come with the products are followed.
EN 335-2 applies as a European standard and makes recommendations as to whether wood and wood products should be used indoors, outdoors, in the ground environment, or in marine environments. Sioo:x is, according to standard EN335-2, approved for use above ground, ie outdoors and weather exposed, thus mainly for rainwater. Based on the results of the EN 113 test, Sioo:x treated wood is suitable for use class applications 3.1 and 3.2 without the need for additional prerogative treatment.
(The results were presented within Swedac Accreditation and become part of an extensive research project with the working title “Sioo Wood Protection – An environmentally sound and sustainable wood protection”. The research is done in collaboration with Vinnova, Sweden’s innovation agency).
SP-RISE✯ tests against mould infestation
To assess Sioo:x resistance to mould and rot fungus, we conduct regular tests in collaboration with RISE, Sweden’s research institute and innovation partners for business, academia and the public sector.
In a lab test, Sioo:x treated wood specimens were exposed to mould spores according to ASTM D3273, a well-established Standard Test Method for Resistance to Growth of Mould. The results show a reduction of mould growth with the Sioo:x treatment. The strongest reduction of mould growth was obtained for larch and spruce, but also for the delicate pine plinth, the reduction was significant.
It was also found that Sioo:x, when applied correctly, causes microorganisms to become poorly attached to the treated wood surface. This is due to the Sioo:x mechanical principle of action and shows that, even without biocides, effective wood protection can be achieved through the silicon treatment.
The collaboration with RISE does not end there: Sioo:x is part of a “RISE test bed for wood in an outdoor environment” that evaluates the durability of wood-based materials and surface treatments, primarily for outdoor use.