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Hardness Testers: Scales for Specifications

By: Rich M

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Hardness testers are industrial products used in order to measure a certain material's capacity to resist indentation, notches or recesses. This is done by measuring the depth of the indentation of any material. The results showing the smaller indentations signify that the material is harder than the other.

To understand more about the product known as hardness testers, one must be able to look into the scales used in order to determine a material's hardness. There are different varieties ranging from Brinell, coating, Rockwell and nanoindentation to Vickers and Knoop, coating and ultrasonic. There are also methods used along these techniques like superficial, macro and micro testing. Some of these scales are explained in the succeeding paragraphs.

Coating hardness tester

This is a scale that gauges the hardness of a material through the use of scratching, rubbing and indentation tests. The same evaluates the wear resistance of adhesives, sealants, thin paint films and CDs and DVDs. When evaluating coating hardness, brilliant ideas are based from indentation testers of Barber Coleman, Persoz and Koenig pendulums and Bucholz. Sclerometers are also utilized to evaluate and measure the pressure that often results to scratches in a certain material.

Rockwell hardness tester

This scale in testing hardness is very popular in significant portions of operation because companies find it to yield more accurate results than other tests at the same time easier to perform. These are utilized in all sorts of metals except when variations are introduced on the said materials. It measures permanent depth by using force on the indenter or hardness tester. Pre-test and additional test forces are used in the process of making use of Rockwell hardness testers.

Brinell hardness tester

This tester is employed in casting or forging industries. It makes use of a pre-test or predetermined test force through the aid of a carbide ball. The ball is held for a set of time before it is removed. The indentation's diameter undergoes two-time measurements before getting the average results and detecting the hardness of the material. The heavier the load or the material, the more rigid the Brinell testing made.

Other scales of hardness testers

Apart from the above-mentioned scales, there are yet other forms used in order to measure the hardness of the material. Dynamic rebound for instance is done by using a certain amount of impact on a certain metal or material. A popular example is testing the hardness of diamonds. Another is the Vickers and Knoop utilized in light loads starting from a very few gram measurements to one or more kilograms.

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