Fiberboards 2885 



Table 23-14. — Interlaminar and edgewise shear properties of 1 1 commercial hardboards 

 evaluated by Werren and McNatt (1975; see text footnote 5)'-^ 



Interlaminar shear Edgewise shear 



Hardboard thick- Modulus of Shear Shear Shear 



ness and type^ rigidity'* strength modulus strength 



Thousand Psi Thousand Psi 



psi psi 



TEMPERED 



'/4-inch thick 



A 78.0 430 295 2,850 



B 95.5 490 310 3,200 



C 87.5 565 350 2,860 



D 200.0 840 335 3,440 



E 120.0 485 330 2,860 



F 71.0 495 290 2,550 



G 96.5 850 350 3,410 



H 125.5 540 405 2,880 



J 66.0 455 315 2,980 



K 130.0 815 295 3,120 



L 159.5 705 305 2,860 



STANDARD 



'/4-inch thick 



A 71.5^ 410 240 2,060 



E 106.0-^ 440 285 2,440 



J 93.0^ 520 325 2,970 



TEMPERED^ 



'/s-inch thick 



A — 620 320 3,610 



E — 600 300 3,380 



J — 510 285 3,180 



STANDARD" 



'/s-inch thick 



A — 520 245 2,360 



E — 500 260 2,610 



J — 490 245 2,590 



'Each value based on 50 determinations unless otherwise noted. 



^Tests made according to ASTM D 1037 or ASTM D 3044; material in equilibrium at time of test. 

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

 "^Based on secant modulus at 20 percent of maximum stress. 

 ^Based on 30 determinations. 



^Due to extremely small deformations, elastic modulus could not be determined for interlaminar 

 shear. 



