The level of hardness of a material is defined as the resistance against deformation and is often determined by drawing an indenter into the material under a specific load.
Can be applied to:
Metals, plastics, coatings
Test method standards:
EN-ISO 6506-1, EN-ISO 6507-1, EN-ISO 6508-1, ASTM A255, ISO 15184, ASTM D3363, ISO 1518-1, ISO 4586-2, ISO 2815
1. Brinell (EN ISO 6506-1)
Impressions are made using a hard metal ball of a defined diameter and with a specific load.
2. Rockwell (EN ISO 6508-1)
This method is applicable for hard materials in which impressions are made using a diamond cone. The depth of those impressions is measured. Different scales and indenters are possible, indicated by a letter ranging from A to K.
3. (Micro) Vickers (EN ISO 6507-1)
This method uses a pyramid shaped diamond indenter to make 3 small impressions in the material. Upon completion of indentation, the two diagonals will be measured. This measurement can be made directly on the material or on a polished cross section of the sample.
4. Jominy (ASTM A255)
This is a test to determine how deep steel can be hardened. You provide us with a sample with diameter 40 mm, length 15 to 20 cm. We make a special test sample according to the standard. The bar is heated to its hardening temperature and is quenched in a special apparatus with water. The hardness is then measured according to the Rockwell-C method.
5. Pencil hardness (ISO 15184 or ASTM D3363)
Pencils with a defined hardness are moved over the surface with a constant force. The pencil hardness of a surface is expressed as the notation on the pencil (hardness) which makes no scratch: either the first one after a scratch is made, or the last one before a scratch appears.
6. Sclerometer hardness (ISO 1518-1 or variant to ISO 4586-2)
A tungsten carbide tip (diameter 0.75 or 1.00 mm) is moved across a surface with a preset force. The force is applied by means of a spring. By using different springs, the force can vary from 0 to 30 N. The sclerometer hardness is expressed in Newton (N) or as a classification based on the lowest pressure at which a scratch can be made.
7. Buchholz hardness test (ISO 2815)
A sharp wheel with a constant weight is placed on the surface for a fixed time. The length of the remaining deformation is an indication of the indentation resistance of the coating. It can be expressed in BH or Buchholz hardness by conversion.
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About Sirris Testlabs
Since 1949, Sirris has been helping companies in Belgium to innovate. With our high-tech testing labs and our skilled material experts we want to support the Belgian manufacturing industry in testing and improving its products.