Knoop hardness scale
Revision as of 12:31, 27 April 2013 by (username removed)
Description
A hardness scale based on measuring indentations that was developed in 1939 by F. Knoop, a 20th century chemist. The Knoop hardness scale ranges from glass (300-600) to diamond (6000-6500). A Knoop hardness tester drops a pointed diamond indentor onto a material then examines the size and depth of the indentation to determine surface hardness. This test is generally used on brittle materials like ceramics.
Synonyms and Related Terms
Knoop-Hrte (Deut.)
Authority
- G.S.Brady, G.S.Brady, Materials Handbook, McGraw-Hill Book Co., New York, 1971
- Theodore J. Reinhart, Theodore J. Reinhart, 'Glossary of Terms', Engineered Plastics, ASM International, 1988
- Richard S. Lewis, Richard S. Lewis, Hawley's Condensed Chemical Dictionary, Van Nostrand Reinhold, New York, 10th ed., 1993
- Encyclopedia Britannica, http://www.britannica.com Comment: Knoop Hardness." Encyclopdia Britannica. 8 Sept. 2004 .