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The Janka hardness test (English: / ˈdʒæŋkə /; [1] German: [ˈjaŋka]), created by Austrian-born American researcher Gabriel Janka (1864–1932), measures the resistance of a sample of wood to denting and wear. [citation needed] It measures the force required to embed an 11.28-millimeter-diameter (7⁄16 in) steel ball halfway into a ...
The density is typically between 500 and 1,000 kg/m 3 (31 and 62 lb/cu ft). [5] The range of density and classification as light-, standard-, or high-density board is a misnomer and confusing. The density of the board, when evaluated in relation to the density of the fibre that goes into making the panel, is important.
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.
Plywood. Softwood plywood made from spruce. The principle of making plywood. Plywood is a composite material manufactured from thin layers, or "plies", of wood veneer that have been stacked and glued together. It is an engineered wood from the family of manufactured boards, which include plywood, medium-density fibreboard (MDF), oriented strand ...
They weigh less than 4,000 lb (1,814 kg) to limit the stresses on handling equipment. They are weatherproof, and stack 16 ft (4.877 m) high. They often use steel pallets, steel straps with notched seals, outdoor plywood, and plastic film.
The ultimate tensile strength of a material is an intensive property; therefore its value does not depend on the size of the test specimen.However, depending on the material, it may be dependent on other factors, such as the preparation of the specimen, the presence or otherwise of surface defects, and the temperature of the test environment and material.
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 ...
Engineered lumber can be cut to length and installed much like sawn lumber; the flitch requires shop fabrication and/or field bolting. This, coupled with a much increased self-weight of the beam (11.4 pounds (5.2 kg) for engineered wood vs. 25.2 pounds (11.4 kg) for a flitch beam), decreases the viability of the system.
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