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Plastic lumber is composed of virgin or waste plastics including HDPE, PVC, PP, ABS, PS and PLA. The powder or pellets are mixed to a dough-like consistency at roughly 400 °F (204 °C) and then extruded or molded to the desired shape. Additives such as colorants, coupling agents, stabilizers, blowing agents, reinforcing agents, foaming agents ...
Section modulus is a geometric property for a given cross-section used in the design of beams or flexural members. Other geometric properties used in design include area for tension and shear, radius of gyration for compression, and second moment of area and polar second moment of area for stiffness. Any relationship between these properties is ...
With a high strength-to-density ratio, HDPE is used in the production of plastic bottles, corrosion-resistant piping, geomembranes and plastic lumber. HDPE is commonly recycled, and has the number "2" as its resin identification code. In 2008, the global HDPE market reached a volume of more than 30 million tons. [2]
A plastic skid with nine legs, which can be lifted from all four sides. This type of transport is commonly called a pallet, but since it has no bottom it is technically a skid. A metal pallet with removable beams, in this case for firewood Automated palletizer of bread with industrial KUKA robots at a bakery in Germany 48 in × 40 in (122 cm × ...
Plank (wood) A plank used in the repair of a ship. A plank is timber that is flat, elongated, and rectangular with parallel faces that are higher and longer than wide. [ 1] Used primarily in carpentry, planks are critical in the construction of ships, houses, bridges, and many other structures. [ 2] Planks also serve as supports to form shelves ...
A Biltmore scale inscribed on an axe. Diameter at breast height (DBH) is measured by holding the stick a fixed distance, usually 25 inches (64 cm), from the eye, and at breast height, which in the United States is 4.5 feet (1.4 m) up the bole of the tree.
Typical dimensions of today's "two by four" is 1.5 by 3.5 inches (38 mm × 89 mm) dimensional lumber prior to sanding and are typically placed 16 inches (406 mm) from each other's center, but sometimes also at 12 inches (305 mm) or 24 inches (610 mm).
As previously noted, less wood is needed to produce a given finished size than when standards called for the green lumber to be the full nominal dimension. However, even the dimensions for finished lumber of a given nominal size have changed over time. In 1910, a typical finished 1-inch (25 mm) board was 13 ⁄ 16 in (21 mm). In 1928, that was ...
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