Hi-Tech performs field hardness testing using portable units in accordance with ASTM A-956 (Equotip) or ASTM A-833
(Brinell) to meet applicable client specifications.
Equotip is a rebound test method using a technology developed by Deitmar Leeb. Values derived from the Equotip
unit can be transposed into equivalent hardness values, e.g. Brinell, Rockwell, etc. A spring loaded impact body with a
tungsten carbide tip is impacted upon the surface and by measuring the rebound, a hardness value is determined.
Harder materials result in greater rebound at a given energy level.
Brinell hardness is an indentation comparison type test used to meet certain application requirements. An impact ball
(indenter) is placed between the item and a test bar of known hardness and then struck with a hammer. Using a comparator
(Brinell microscope) the two indentations are compared and a relative hardness value is derived.
Hardness testing is performed on metal surfaces, most often steel, in heat affected zones, welds or other areas where
the hardness value is critical. The portability of our systems allow hardness testing to be performed on-site. Limitations
regarding surface preparation, metal thickness and access should be discussed when determining the method to be
used. Other methods are available upon request when specific requirements dictate the use of UCI type testing.