Table 1. — Physical and strength pro p erties of green and air-dry apitong from the 
Philippine s£ 
Property 
s 
: — 
t Green 
: 
Moisture condition 
•Air-dry (adjusted 
to 12 percent 
moisture content )i. 
Moisture content , «. .percent: 
Specific gravity — volume as tested..., : 
Shrinkage, in volume — green to oven-dry.. percent: 
Shrinkage, radial — green to oven-dry ..do.: 
Shrinkage, tangential — green to oven-dry do.: 
: 
Static bending : 
Fiber stress at proportional limit p.s.i.: 
Modulus of rupture..... . ....do.: 
Modulus of elasticity .1,000 p.s.i.: 
Work to proportional limit.. .in. -lb, per cu. in.: 
Work to maximum load ...••«.. • .... * do. : 
Compression parallel to grain : 
Crushing strength at proportional limit.. .p.s.i. : 
Maximum crushing strength........... ..do.: h,500 
39 
, 0.58 i 
U 16.0 
t 12 
0.63 
i 
fe U.9 
^11.6 
5,000 ! 
9,h00 ! 
1,9U0 
0.77 : 
7.67 i 
3,300 i 
h, 500 ! 
7,700 
12,300 
1,9U0 
l 1.62 
111. 8 
5,300 
6,200 
Compression perpendicular to grain 
Crushing strength at proportional limit. ... „ .do. 
Hardness^. 
End lb. 
Radial . » „ < do 
Tangential, r do 
::} 
Shearing strength 
Radial , p.s.i. 
Tangential, 
,do. 
680 
870 
780 
l,lii0 
990 
910 
880 
1,330 
iTable prepared by John T. Drow, Timber Mechanics Division, U. S. Forest Products 
Laboratory. 
iPata on green material from "Comparative Strength Properties of the Principal 
Philippine Commercial Woods," by Jose C. Espinoca, Phil. Jour. Sci. Vol. 33, 
No. k, 1927. 
sLData on air-dry material from same source as data for green material but ad- 
justed from 17 to 12 percent moisture content on the basis of the usual 
exponential relationship, assuming an "intersection point" of 25 percent mois- 
ture content. 
-Shrinkage data are approximate, representing the sum of shrinkage values from 
green to air-dry and air-dry to oven-dry, as reported in Phil. Bur. For. 
Tech. Bull. No. 7, Appendix 6. 
^Load to imbed a O.hUU-inch steel ball to l/2 its diameter. 
Report No. R1920 
