Strausbaugh, Perry D. Department of Botany, West Virginia University, Morgantown, West Virginia.
Core, Earl L. Department of Biology, West Virginia University, Morgantown, West Virginia.
- Links to Primary Literature
- Additional Readings
Any of a number of South American trees belonging to different genera but having similar qualities, with all being a valuable source of wood, bark, and tannin. Quebracho trees, including those of the genus Schinopsis (family Anacardiaceae) [see illustration], are indigenous to South America. In particular, the heartwood of Schinopsis lorentzii is called quebracho (meaning axbreaker in Spanish) in reference to its exceedingly hard wood, which is one of the hardest known woods. On average, the Janka hardness for quebracho is 4700 lb-force (2132 kg-force); its density is 80 lb/ft3 (1280 kg/m3). Quebracho is the world's most important source of tannin. The logs are chipped, and then the chips are cooked with steam in copper extractors. The liquor becomes highly concentrated, up to 40–60%, with tannin. It is used either alone or in combination with other chemicals for tanning of all kinds of leather. See also: Forest and forestry; Leather and fur processing; Sapindales; Tree
The content above is only an excerpt.
for your institution. Subscribe
To learn more about subscribing to AccessScience, or to request a no-risk trial of this award-winning scientific reference for your institution, fill in your information and a member of our Sales Team will contact you as soon as possible.
to your librarian. Recommend
Let your librarian know about the award-winning gateway to the most trustworthy and accurate scientific information.
AccessScience provides the most accurate and trustworthy scientific information available.
Recognized as an award-winning gateway to scientific knowledge, AccessScience is an amazing online resource that contains high-quality reference material written specifically for students. Its dedicated editorial team is led by Sagan Award winner John Rennie. Contributors include more than 9000 highly qualified scientists and 39 Nobel Prize winners.
MORE THAN 8500 articles and Research Reviews covering all major scientific disciplines and encompassing the McGraw-Hill Encyclopedia of Science & Technology and McGraw-Hill Yearbook of Science & Technology
115,000-PLUS definitions from the McGraw-Hill Dictionary of Scientific and Technical Terms
3000 biographies of notable scientific figures
MORE THAN 17,000 downloadable images and animations illustrating key topics
ENGAGING VIDEOS highlighting the life and work of award-winning scientists
SUGGESTIONS FOR FURTHER STUDY and additional readings to guide students to deeper understanding and research
LINKS TO CITABLE LITERATURE help students expand their knowledge using primary sources of information