WOOD RESEARCH Volume 63, Number 6, 2018
Eva Jeřábková, Daniela Tesařová, and Hana Polášková

Resistance of various materials and coatings used in wood constructions to growth of microorganisms

This contribution deals with the resistance of various materials and coatings used in wood constructions to mould growth and in the case of wood and varnishes also to bacterial growth. For testing the resistance to mould growth, the standard EN 14119, method A2 (without agar medium) and method B1 (with agar medium) were used. Tests were performed with Aspergillus niger, Chaetomium globosum, Penicillium funiculosum, Gliocladium virens and Paecilomyces variotii. Resistance to bacterial growth was tested according to the standard JIS Z 2801 with bacteria Staphylococcus aureus and Escherichia coli. Most of materials tested without agar medium were resistant to mould growth. However, the addition of the agar medium (simulation of real conditions; high dampness and presence of nourishment) predictably caused worse results. Cement bonded particleboard, extruded polystyrene and water-borne varnish were very resistant to moulds. Moreover, the water-borne varnish showed a heavy resistance to microbial growth, while a two solvent-borne polyurethane varnish showed no resistance to microorganisms.

WOOD RESEARCH Volume 64, Number 1, 2019
S. Sadiye Yasar

Effects of wood preservatives on the combustion process and combustion quality of wood

This study examines the combustion properties of Scots pine (Pinus sylvestris L.) and Oriental beech (Fagus orientalis L.) in 3 stages (CWF, SC and EC) according to ASTM E 160-50 (1975). Wood samples were impregnated with Tanalith-E (T) and Wolmanit-CB (WC) and then were varnished with Synthetic (St) and water based (wb) varnishes. When the combustion was completed, the weight loss, combustion temperatures, illuminance values, total time of combustion, and demolition time were measured. As the result, illuminance value of Oriental beech wood decreased, while the smoke density increased. Scots pine was later destroyed in the combustion process. Areas with a risk of fire are advised to use pine wood instead of beech. Wolmanit-CB and synthetic varnish reduced the temperature and illuminance values. Oriental beech, Tanalith-E, and synthetic varnish resulted in the highest temperatures for all combustion stages. This triple interaction increased total combustion time values by more than 90% when compared with the control samples.