Grading Rules

(BS) EN 335:2013   Durability of wood and wood-based products – Use classes: definitions, application to solid wood and wood-based products The new EN 335:2013 combines EN 335-3:1995; EN 335-1:2006 and EN 335-2:2006. It gives general definitions of Use Classes for different service situations and is relevant to solid timber and wood-based products. It gives information on the biological agents that …

(BS) EN 326-2:2010+A1:2014 Methods for internal initial type testing, initial factory production control and external control of wood-based panels to ensure they comply with the harmonised standard EN 13986 are all contained in this part of the standard. The manufacturer has the option of applying the same criteria for applications other than construction. Amendment 1 (A1) was added in 2014 to meet …

(BS) EN 326-1: 1994 (confirmed 2014) Wood-based Panels – Sampling and cutting of test pieces and inspection (Specific information on the cutting of test pieces and the expression of test results are available in clauses 6 & 7 of EN 324-1). Panel properties for testing by EN 326 Panel Property EN Standard Panel TypeMoisture contentEN 322Plywood, OSB, LVLDimensional movementEN 318Plywood, OSB, LVLDensityEN …

(BS) EN 324-2: 1993 Wood-based Panels – Determination of squareness and edge straightness Part 2 specifies methods for measuring the squareness and edge straightness of wood-based panels.  It applies to whole flat boards. Squareness Use a mechanical square having two arms each 1000mm (±1mm) length fixed at right angles to one another.  Place one side of the square against one …

(BS) EN 324 -1: 1993 Wood-based Panels – Determination of thickness, width and length Part 1 gives methods for measuring the thickness, width and length of wood-based panels.  It applies to whole flat boards. Thickness A micrometer or similar measuring instrument having flat, parallel measuring surfaces of 16mm (± 1) diameter and an operating force of 4N (± 1) and …

(BS) EN 323 : 1993 Wood-based panels – Determination of density This specifies a method for determining the density of test pieces of wood-based panels.  These results may be used to estimate the density of wood-based panels according to EN 326 -1 : Wood-based panels – Sampling, cutting and inspection – Sampling and cutting of test pieces and expression of test …

(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 …

(BS) EN 313-2: 2000 (confirmed 2014) Plywood – Classification and Terminology – Terminology This standard defines the principal terms concerning plywood.