Pacific Southwest

Title: Specific gravity variation in robusta eucalyptus grown in Hawaii

Author: Skolmen, Roger G.

Date: 1972

Source: Res. Paper PSW-RP-78. Berkeley, CA: Pacific Southwest Forest & Range Experiment Station, Forest Service, U.S. Department of Agriculture; 7 p

Station ID: RP-PSW-078

Description: The specific gravity (air-dry volume, ovendry weight) of Eucalyptus robusta wood was tested within and between trees from 10 stands. Mean specific gravity was 0.603, but the range in individual samples for 50 trees was 0.331 to 0.869, and was 0.357 to 0.755 within one cross section. A consistent increase was recorded in all trees from pith to cambium and from butt to top. Mean for brittleheart (brash wood near the pith) was 0.503, considerably lower than that for normal wood at 0.651. Manufacturing problems caused by density variation could be reduced by sorting before sawing and during grading.

Keywords: Eucalyptus robusta, wood density, specific gravity, brittle-heart, variation, Hawaii

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Citation

Skolmen, Roger G.  1972.  Specific gravity variation in robusta eucalyptus grown in Hawaii.   Res. Paper PSW-RP-78. Berkeley, CA: Pacific Southwest Forest & Range Experiment Station, Forest Service, U.S. Department of Agriculture; 7 p.