Evaluation of selected properties of boards with increased fire resistance

Abstract

This bachelor thesis is focused on the evaluation of the properties of the OSB (Oriented Strand Board) board. The evaluation and classification of OSB are based on the determination of sorption isotherms depending on moisture content and relative humidity. In the practical part, the changes in the properties of two different OSB boards were defined by the sorption isotherm method at a constant temperature, which was carried out by storing them in conditioned boxes with a specified relative humidity. As a result, we recognized which type of Isotherm it was and that at the highest relative humidity (RH) we obtained the highest moisture content. Another chapter that was considered in this study was the fire resistance of OSB. In the practical part, a single flame source test method was considered, which was carried out according to the requirements of ISO 834 (ISO 11925-2:2020). Results showed the different spread of flame for OSB itself and coated OSB. It has also considered the impact of a very humid area on OSB, where after being the material in a damp area, there appeared mould. The last objective was an abrasion test which was done by The Taber® Rotary machine to see the abrasion impact on coated and uncoated OSB.

This bachelor thesis is focused on the evaluation of the properties of the OSB (Oriented Strand Board) board. The evaluation and classification of OSB are based on the determination of sorption isotherms depending on moisture content and relative humidity. In the practical part, the changes in the properties of two different OSB boards were defined by the sorption isotherm method at a constant temperature, which was carried out by storing them in conditioned boxes with a specified relative humidity. As a result, we recognized which type of Isotherm it was and that at the highest relative humidity (RH) we obtained the highest moisture content. Another chapter that was considered in this study was the fire resistance of OSB. In the practical part, a single flame source test method was considered, which was carried out according to the requirements of ISO 834 (ISO 11925-2:2020). Results showed the different spread of flame for OSB itself and coated OSB. It has also considered the impact of a very humid area on OSB, where after being the material in a damp area, there appeared mould. The last objective was an abrasion test which was done by The Taber® Rotary machine to see the abrasion impact on coated and uncoated OSB.