Estimating Janka hardness from specific gravity for tropical and temperate species

Michael C. Wiemann; David W. Green

doi:10.2737/FPL-RP-643

Treesearch

Estimating Janka hardness from specific gravity for tropical and temperate species

Informally Refereed

Authors:

Michael C. Wiemann, David W. Green

Year:

2007

Type:

Research Paper

Station:

Forest Products Laboratory

DOI:

https://doi.org/10.2737/FPL-RP-643

Source:

Research Paper FPL-RP-643. Madison, WI: U.S. Department of Agriculture, Forest Service, Forest Products Laboratory. 21 pages.

Download (PDF 591 KB)

Download (PDF 591 KB): https://research.fs.usda.gov/download/treesearch/28975.pdf

Abstract

Using 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.

Keywords

Janka hardness, specific gravity, temperate hardwoods, tropical hardwoods, softwoods

Citation

Wiemann, 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.