3026 



PROPERTIES ACHIEVABLE IN PRODUCTION 



Chapter 24 



Properties achieved in laboratory boards are discussed in detail by Hunt et al. 

 (1978). Correspondence in 1981 with the team conducting this research indi- 

 cates that properties shown in table 24-26 are probably achievable in 1-1/8-inch 

 northern red oak roof decking manufactured as previously described. 



Additional data on thermal characteristics of thick red oak flakeboard were 

 provided by White and Schaffer (1981). 



Table 24-26. — Properties of three-layer particleboard roof deck of red oak sp} 



Statistic 



Panel density (based on ovendry 



weight and volume at 5-percent 



moisture content), Ib/cu ft 



34.9 



37.5 



41.9 



Panel thickness, inch 1-3/16 1-3/16 1-1/8 



Panel MOE, psi 



Parallel to grain of aligned face 



flakes (D1037)2 776,000 768,000 1 ,064,000 



Parallel to grain of aligned face 



flakes (D198)3 1 ,087,000 1 , 107,000 1 ,410,000 



Perpendicular to grain of aligned face 



flakes (D1037)2 197,000 247,000 353,000 



Panel MOR, psi (01037)^ 

 Parallel to grain of aligned 



face flakes 3,410^ 3,040^ 6,700 



Perpendicular to grain of aligned , 



face flakes 1,140 1,490 2,460 



IB, psi 21 23 90 



Interlaminar shear strength, psi 72 99 287 



Thickness swell, percent 



30 to 90 percent RH 7.1 6.5 5.1 



OD-VPS^ 11.9 15.5 16.8 



Linear expansion, parallel^, percent 



30 to 90 percent RH .092 .099 .1 10 



OD-VPS^ .172 .188 .192 



Linear expansion, perpendicular^, percent 



30 to 90 percent RH .406 .425 .415 



OD-VPS^ .701 .835 .885 



h » ft^ . °F 

 Thermal resistance, 1.60 



Btu 



'Data from personal correspondence with M. O. Hunt, Purdue University, March 19, 1981. 



^American Society for Testing and Materials (1975a). 



^Two-point bending load applied at third points of 2.5- by 12-foot panels; American Society for 

 Testing and Materials (1975b). 



'^Because almost all of these bending specimens failed in horizontal shear, these MOR values are 

 understated. 



^Ten cycles, each comprised of placing specimens in an autoclave, covering them with water, 

 subjecting them to a vacuum of 27.5 inches Hg for 30 minutes, followed by a water soak under 

 pressure of 60 psi for 1 to 1-1/4 hours; specimens were then allowed to drain for 30 minutes and then 

 were dried at 180°F for about 30 hours to lower specimen weight to within 5 or 10 percent of original 

 weight. 



^25-inch gauge length. 



