Solid Wood Products 2695 



Species of face and back veneers 



and of inner-ply veneers Wood failure 



Percent 



Red oak 



Red maple 87 



Sycamore 82 



Black tupelo 80 



Yellow-poplar 80 



Hickory 



Black tupelo 92 



Red maple 88 



Beech 85 



No combination of white oak or of chestnut oak face and back veneers, however, 

 yielded average percent wood failure above 55 percent, regardless of species of 

 inner plys. 



Weight of hardwood plywood. — Carpenters prefer light panels; they are 

 accustomed to the weight of loblolly pine plywood which compares with hard- 

 wood plywood as follows (Craft 1975): 



Face-ply species Three plys Five plys 



and inner-ply species of '/s-inch of Vs-inch 



Pounds per 4- by 8-foot 



panel at 8-percent moisture 



content 



Loblolly pine 



Loblolly pine 35.2 58.6 



White oak 



White oak 45.6 76.0 



Red oak 



Yellow-poplar 38.9 57.6 



Red maple 41.1 64.0 



Black tupelo 41.0 63.9 



Hickory 



Yellow-poplar 42.5 62.0 



Red maple 44.7 68.4 



Black tupelo 44.6 68.3 



Face glued blockboard. — Blockboard is a form of lumber-core plywood, 



the latter a product that has for years been used in the United States and Canada 

 in furniture and cabinet manufacture. Face-glued blockboard is distinguished 

 from lumber-core plywood in that gluelines are found only between face veneers 

 and the core; the core strips in blockboard are not edge glued as they are in 

 lumber-core plywood. In Europe, face-glued blockboard panels are used for 

 industrial shelving, storage units, packing cases, doors and partitions, bench 

 tops, and even as combination subflooring underlayment (Bowyer 1979a). 

 Bowyer (1979a) constructed face-glued blockboard from 0.1 -inch elm face 

 veneers and 0.8-inch-thick aspen core strips in short lengths; the core strips were 

 1.5 or 3 inches wide. He concluded that such blockboard has dimensional 

 stability properties very similar to softwood plywood, and that low-density 



