2856 



Chapter 23 



Co 



1^ 



I 4 9 



HEAT TREATMENT TIME (HRS) 



^ 100 



.^ 



80 



^ 60 

 ^ 40 



I 



320 5: 



356 [JJ 



—• - 374 



I 

 i 



TREATING TIME (HOURS) 



Figure 23-84. — Reduction of thickness swelling in hardboard after heat treatment at 

 various temperatures and times. (Top) Percent expansion; drawing after Klinga and 

 Back (1964). (Bottom) Relative thickness swelling in Vs-inch hardboard related to that 

 for no heat treatment; drawing after Brauns and Strand (1958). 



