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Softwood plywood[ edit ] Softwood plywood is usually made either of cedarDouglas fir or sprucepineand fir collectively known as spruce-pine-fir or SPF or redwood and is typically used for construction and industrial purposes.
Plies vary in thickness from 1. The number of plies—which is always odd—depends on the thickness and grade of the sheet. Hardwood plywood[ edit ] Hardwood plywood is made out of wood from angiosperm trees and used for demanding end uses.
Hardwood plywood is characterized by its excellent strength, stiffness and resistance to creep.
It has a high planar shear strength and impact resistance, which make it especially suitable for heavy-duty floor and wall structures. Oriented plywood construction has a high wheel-carrying capacity. Hardwood plywood has excellent surface hardness, and damage- and wear-resistance.
Originally from the Asian region, it is now also manufactured in African and South American countries.
Tropical Sawdust as plyboard is superior to softwood plywood due to its density, strength, evenness of layers, and high quality. It is usually sold at a premium in many markets if manufactured with high standards. It is used for construction purposes in many regions due to its low cost.
It was used in the construction of air assault gliders during World War II and also several fighter aircraftmost notably the multi-role British Mosquito. Nicknamed "The Wooden Wonder" plywood was used for the wing surfaces, and also flat sections such as bulkheads and the webs of the wing spars.
Structural aircraft-grade plywood is most commonly manufactured from African mahogany, spruce or birch veneers that are bonded together in a hot press over hardwood cores of basswood or poplar or from European Birch veneers throughout.
Basswood is another type of aviation-grade plywood that is lighter and more flexible than mahogany and birch plywood but has slightly less[ citation needed ] structural strength. Aviation-grade plywood is manufactured to a number of specifications including those outlined since in the Germanischer Lloyd Rules for Surveying and Testing of Plywood for Aircraft and MIL-P, the latter of which calls for shear testing after immersion in boiling water for three hours to verify the adhesive qualities between the plies and meets specifications.
Decorative plywood overlaid plywood [ edit ] Flexible plywood[ edit ] Flexible plywood is designed for making curved parts, a practice which dates back to the s in furniture making.
Wiggle board is often glued together in two layers once it is formed into the desired curve, so that the final shape will be stiff and resist movement. Often, decorative wood veneers are added as a surface layer.
In the United Kingdom single-ply sheets of veneer were used to make stovepipe hats in Victorian times, so flexible modern plywood is sometimes known there as "hatters ply",[ citation needed ] although the original material was not strictly plywood, but a single sheet of veneer.
Marine plywood[ edit ] Marine plywood is manufactured from durable face and core veneers, with few defects so it performs longer in both humid and wet conditions and resists delaminating and fungal attack.
Its construction is such that it can be used in environments where it is exposed to moisture for long periods.Sawdust - Wikipedia, the free encyclopedia Sawdust or wood dust is a by-product of cutting, grinding, drilling, sanding, or otherwise pulverizing wood, As such, it was formerly common on barroom floors.
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The Hazards of Plywood. Plywood is a common building material. Being cheap and plentiful, thousands of different applications exist, from home building to furniture building to shipping crate construction.
A benefit of using plywood is that much of it is made out of fast-growing trees such as pine or spruce, which are easily replenished.
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