BS ISO 2426-1:2020 pdf free.Plywood一Classification by surface appearance. BS ISO 2426-1 This document establishes general rules for the classification of plywood by its surface appearance.It concerns plywood made of hardwood including tropical and temperate hardwood, softwood and plywood derived from other lignocellulosic materials.It does not apply to overlaid plywood.The following documents are referred to in the text in such a...