1. THE EFFECT OF VENEER IMPREGNATION WITH A MIXTURE OF POTASSIUM CARBONATE AND UREA ON THE PROPERTIES OF MANUFACTURED PLYWOOD.
- Author
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KAWALERCZYK, Jakub, DZIURKA, Dorota, MIRSKI, Radosław, and GRZEŚKOWIAK, Wojciech
- Subjects
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MODULUS of rigidity , *POTASSIUM carbonate , *PLYWOOD , *FIREPROOFING agents , *IMPACT strength , *MODULUS of elasticity , *DENTAL ceramics , *IGNITION temperature - Abstract
It was determined how the impregnation of birch veneers with a mixture of potassium carbonate and urea affected the fire protection properties, shear strength, modulus of elasticity and modulus of rigidity of plywood glued with PF and UF resin. Veneers were impregnated by soaking in aqueous fire retardant solutions with concentrations of 20% and 30%. Measurements of mass loss, burned area and time of ignition showed the fire protection provided to be very effective. Impregnation did not significantly affect the modulus of elasticity or modulus of rigidity of the plywood. Impregnation caused a decrease in bonding quality, especially in the case of plywood with UF resin soaked in water. For the samples with PF resin, both immersed and boiled in water, impregnation had less impact on the shear strength: its values exceeded 1 N/mm2, thus meeting the requirements of EN 314-2. [ABSTRACT FROM AUTHOR]
- Published
- 2019
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