Skip to Main Content
Estimating Janka hardness from specific gravity for tropical and temperate speciesAuthor(s): Michael C. Wiemann; David W. Green
Source: Research Paper FPL-RP-643. Madison, WI: U.S. Department of Agriculture, Forest Service, Forest Products Laboratory. 21 pages.
Publication Series: Research Paper (RP)
Station: Forest Products Laboratory
View PDF (719 KB)
DescriptionUsing mean values for basic (green) specific gravity and Janka side hardness for individual species obtained from the world literature, regression equations were developed to predict side hardness from specific gravity. Statistical and graphical methods showed that the hardness–specific gravity relationship is the same for tropical and temperate hardwoods, but that the relationship for softwoods is different from that for hardwoods. As expected, the relationship for green wood is different from that for wood at 12% moisture content.
- We recommend that you also print this page and attach it to the printout of the article, to retain the full citation information.
- This article was written and prepared by U.S. Government employees on official time, and is therefore in the public domain.
CitationWiemann, Michael C.; Green, David W. 2007. Estimating Janka hardness from specific gravity for tropical and temperate species. Research Paper FPL-RP-643. Madison, WI: U.S. Department of Agriculture, Forest Service, Forest Products Laboratory. 21 pages.
KeywordsJanka hardness, specific gravity, temperate hardwoods, tropical hardwoods, softwoods
- Hardness, density, and shrinkage characteristics of silk-oak from Hawaii
- Janka hardness using nonstandard specimens
- Wood anatomy of the neotropical Sapotaceae : XV. Sandwithiodoxa
XML: View XML