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The Chemical Composition of Wood

The Chemical Composition of WoodROGER C. Department of Agriculture, Forest Service, Forest Products Laboratory,Madison, WI 53705 This chapter includes overall Chemical Composition ofwood, methods of analysis, structure of hemicellulosecomponents and degree of polymerization of carbohy-drates. Tables of data are compiled for woods of severalcountries. Components include: cellulose (Cross andBevan, holo-, and alpha-), lignin, pentosans, and in 1% sodium hydroxide, hot water, ethanol/benzene, and ether are reported. The data were col-lected at Forest Products Laboratory (Madison, Wis-consin) from 1927-68 and were previously data include both United States and foreignwoods.

Chemical composition varies with tree part (root, stem, or branch), type of wood (i. e., normal, tension, or compression) geographic location, cli-mate, and soil conditions. Analytical data accumulated from many years of work and from many different laboratories have helped to define average expected values for the chemical composition of wood.

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