| | |   Ultrasonic test block. This block of aluminum is stamped "NO 7 ALCOA ULTRASONIC STD. REFERENCE BLOCK A1116".  I'm going to hazard a guess that it's meant for testing ultrasonic inspection systems, which are used to examine critical pipes and welds to locate invisible cracks or voids in the material.  It looks like a solid block, but possibly they have put some kind of defect inside it.  Or maybe it's the reference for non-defective material.
 Source: Ethan Currens
 Contributor: Ethan Currens
 Acquired: 27 December, 2008
 Text Updated: 28 December, 2008
 Price: Anonymous
 Size: 2"
 Purity: 99.9%
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