April 27, 1985|By United Columnist International
Softwood-veneer plywood is best broadly acclimated in architecture and automated applications. It’s fabricated by cross-laminating an odd cardinal of copse veneers such as pine, spruce, fir and hemlock. Running the copse grains at appropriate angles to anniversary added gives plywood its strength. It comes in 4- by 8- bottom panels with 1/4, 3/8, 1/2 and 3/4 inch accepted thicknesses.
During manufacture, copse veneers are affirmed with an adhering beneath a hot press. Depending on the adhering used, the plywood is graded for autogenous or exoteric use. Interior-grade plywood is fabricated with moisture-resistant glue. Exterior-grade uses 100 percent waterproof glue.
Plywood is graded by the affection of the appearance acclimated on the face and aback surfaces, as able-bodied as by the blazon of adhesive. The accomplished affection appearance grades are N and A. These accept smooth, defect-free surfaces. Grades C and D are the lowest. N-grade accustomed accomplishment is all sapwood or heartwood chargeless of accessible defects and with no added than six well-matched copse aliment per panel.
A-grade is agnate with no added than 18 neatly fabricated aliment alongside to the grain. B-grade has a solid apparent with annular adjustment plugs and bound knots acceptable to 1-inch diameter, and with accessory splits allowed.
C-grade (plugged) permits constructed repairs,
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