- heat barrier,
- heat capacity
Origin of heartwood
Examples from the Web for heartwood
Nearly all the larger trees in the Fuegian forests have the heartwood decayed, and are worthless as timber.The Land of Fire|Mayne Reid
Heartwood does undergo changes, but they are gradual and almost entirely independent of the seasons.
A stub left on a trunk or large branch does not heal, but soon begins to rot at the end where the heartwood is exposed.Apple Growing|M. C. Burritt
It is true that sapwood will not resist decay as long as heartwood, if both are untreated with preservatives.
Sapwood, as a rule, shrinks more than heartwood of the same weight, but very heavy heartwood may shrink more than lighter sapwood.Seasoning of Wood|Joseph B. Wagner