(BS) EN 318 : 2002 Wood-based panels – Determination of dimensional changes associated with changes in relative humidity This specifies a method for determining dimensional changes in wood-based panels due to changes in the relative humidity of the air.  This is measured between 65% relative humidity and 85% relative humidity in adsorption and 65% relative humidity and 30% relative humidity in …

(BS) EN 317 : 1993 Particleboards and fibreboards – Determination of swelling in thickness after immersion in water Despite its title, the standard is applicable to Oriented Strand Board.  It specifies a method of determining the swelling in thickness of flat-pressed or drum-pressed particleboards including OSB. Swelling in thickness is determined by measuring the increase in thickness of the test piece …

(BS) EN 315 : 2000 (confirmed 2014) Plywood – Tolerances for dimensions This gives the dimensional tolerances of plywood panels (length, width and thickness) and tolerances for squareness and edge straightness at a moisture control of 10% (±2%). Moisture content is measured according to EN 322: Wood-based panels – Determination of moisture content. The method for measuring thickness, width and length …