2972 



Chapter 24 



YELLOW- POPLAR 



SWEETGUM 



CO 500 



K 200 



100- 



oMr 



POUNDS/CUBIC FOOT 



•2r— r 



a. (o 



Otf) 



o 



UU L_ 



8 10 0*4 6 



RESIN CONTENT (PERCENT) 



10 



Figure 24-37. — Relationship between content of phenol-formaldehyde resin solids (ap- 

 plied as liquid spray) in yellow-poplar and sweetgum flakeboards and internal bond 

 strength, modulus of rupture, and modulus of elasticity at three panel densities. 

 Flakes were 1 /2 to 1 inch long and 0.01 5 inch thick. Panels were pressed 1 5 minutes at 

 350°F with 400 psi specific pressure and equilibrated before test to 8.5 percent mois- 

 ture content. (Drawing after Rice and Carey 1978.) 



