Fiberboards 2883 



Table 23-12. — Specific gravity and elastic and strength properties in static bending of 



11 commercial hardboards evaluated by W err en and McNatt 



(1975, see text footnote 5)' 



Hardboard Modulus Stress at Modulus 



thickness and Moisture Specific of proportional of 



type^ content gravity^ elasticity limit rupture 



Percent Thousand Psi Psi 



psi 



TEMPERED 



'/4-inch thick 



A 7.3 0.95 710 3,730 7,230 



B 7.6 .93 820 3,850 7,630 



C 5.7 .98 860 2,730 6,910 



D 6.4 1.03 815 3,240 7,650 



E 6.3 .99 805 3,270 8,360 



F 7.8 .96 645 2,580 6,990 



G 6.4 .98 790 3,440 8,410 



H 6.1 .97 1,040 3,820 7,060 



J 8.1 .97 715 2,650 7,010 



K 5.8 1 .02 670 2,600 6,360 



L 7.2 1 .02 700 2,050 5,650 



STANDARD 



'/4-inch thick 



A 6.9 .92 505 2,020 4,490 



E 5.4 .95 600 2,310 5,690 



J 7.7 .98 675 2,930 6,890 



TEMPERED 



'/s-inch thick 



A 6.7 .95 735 3,740 8,780 



E 6.6 .96 635 2,920 7,120 



J 7.9 .96 555 2,840 7,150 



STANDARD 



'/s-inch thick 



A 7.6 .88 515 2,320 5,280 



E 5.7 .93 495 1,970 5,160 



J 7.8 .89 450 2,350 5,570 



'Each value based on 100 determinations. 



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



•^Based on volume at test and weight when ovendried. 



