# Brinell Hardness Testing

A hardness test in which a ball shaped indenter (normally 10 mm in diameter) is pressed into the material to be tested by a specified load ranging from 500 to 3000 kilograms. The diameter of the resulting indentation in the tested material is measured and this dimension is converted to a Brinell Hardness number using a mathematical formula or reference table. Brinell Hardness indentations are relatively large, making this an ideal technique for measuring the hardness of materials which are not uniform or homogeneous such as cast iron. This large indentation, however, along with the high load used, makes Brinell Hardness Testing impractical for small or thin materials or parts on which the resulting indentation is unacceptable for cosmetic or dimensional reasons.