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Plywood is made by gluing thin wooden planks together. The thickness of the sheet is 0.2-3.2mm. Sheets are constructed so that the grain orientations of the stacked sheets are usually perpendicular to each other. In normal (birch and poplar) plywood, there are usually an odd number of sections (at least three), so that the grain direction of the surface sheet is always the same. In conifer plywood, there may also be even numbers
