Any wood where you add a chemical substance to help hold the wood together. Usually spalted, burl, and fibrous woods that often have problems with tear out, get stabilized. It done professionally with high pressure. Some of us are experimenting with using vacuum to pull the air and water out of the wood, then have air pressure push the chemicals in. I am working with lacquer and ploy at this time.
Hope that helps.
(wow that spelling was bad, that what happens at 4 am)