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Within Europe basic plywood can be divided into three main categories: birch plywood (density approx. 680 kg/m 3), mixed plywood (density approx. 620 kg/m 3) and conifer plywoods (density 460– 520 kg/m 3). [11]
The EUR-pallet must use at least 78 nails of a specific type that are subject to a prescribed nailing pattern. The final pallet weighs 20 to 25 kg (44 to 55 lb). Only dry wood may be used, to reduce the risk of mold. Each EUR-pallet bears a number of quality marks: On the left corner leg, the EPAL logo is shown.
It is also known as the strength-to-weight ratio or strength/weight ratio or strength-to-mass ratio. In fiber or textile applications, tenacity is the usual measure of specific strength. The SI unit for specific strength is Pa ⋅ m 3 / kg , or N ⋅m/kg, which is dimensionally equivalent to m 2 /s 2 , though the latter form is rarely used.
Plywood and OSB typically have a density of 560–640 kg/m 3 (35–40 lb/cu ft). For example, 9.5 mm (3 ⁄ 8 in) plywood sheathing or OSB sheathing typically has a surface density of 4.9–5.9 kg/m 2 (1–1.2 lb/sq ft). [51] Many other engineered woods have densities much higher than OSB.
The specific weight, also known as the unit weight (symbol γ, the Greek letter gamma), is a volume-specific quantity defined as the weight W divided by the volume V of a material: = / Equivalently, it may also be formulated as the product of density, ρ, and gravity acceleration, g: = Its unit of measurement in the International System of Units (SI) is newton per cubic metre (N/m 3), with ...
Fabric "weight" is often specified as mass per unit area, grams per square meter (gsm) or ounces per square yard. It is also sometimes specified in ounces per yard in a standard width for the particular cloth. One gram per square meter equals 0.0295 ounces per square yard; one ounce per square yard equals 33.9 grams per square meter.
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Molded plywood is the term for two- or three-dimensionally shaped ... Due to its immense strength and low weight, ... Edition, Fritz Becker KG, Brakel 2013; ...