2884 



Chapter 23 



Table 23- 1 3 . — Elastic and strength properties in tension parallel and perpendicular, and 

 in compression parallel, to the surface of 1 1 commercial hardboards evaluated by 

 Werren and McNatt (1975, see text footnote 5)'-^ 



'/4-inch thick 



A 795 4, 140 160 730 4,020 



B 875 4,690 185 760 4,590 



C 965 4,130 240 780 4,520 



D 1 ,010 5,000 360 800 5,900 



E 830 4,430 235 715 4,620 



F 680 3,870 185 595 3,800 



G 835 5,470 380 755 4,920 



H 1 ,035 4,380 230 925 5,880 



J 680 4,100 180 650 3,740 



K 720 3,920 445 700 4,230 



L 845 3,610 265 785 4,180 



STANDARD 



'/4-inch thick 



A 715 3,400 160 690 2,890 



E 740 3,830 220 720 3,460 



J 745 4,720 225 720 3,780 



TEMPERED 



'/8-inch thick 



A 910 5,640 260 835 4,990 



E 850 4,690 280 815 4,410 



J 740 4,590 190 690 4,220 



STANDARD 



'/s-inch thick 



A 660 4,070 140 700 3,130 



E 680 3,690 250 695 3,350 



J 630 4,000 190 650 3,100 



'Each value is an average based on 100 determinations, except modulus of elasticity for '/4-inch 

 standard and both '/s-inch-thick boards are based on 50 determinations. 



^Tests made according to ASTM D 1037; material at equilibrium at time of test. 

 ''See table 23-1 1 for description of the hardboards. 

 Based on secant modulus at 20 percent of maximum stress. 



