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Primer & Chemical Surface Treatment

Buchholz Hardness Test
(Indentation Resistance)

The Buchholz hardness test is used to determine the indentation resistance aB of polymeric coating materials (such as varnishes).
To determine the Buchholz hardness, the hardness tester is placed on the horizontal surface for 30 s. In this position the indenter, a circular knife, leaves an indentation.

The length of the indentation is measured with a microscope (20× magnification). Based on this length, a comparison table is used to determine the indentation resistance aB. A more comprehensive examination of the indentation is possible, for example, using a 3D microscope.

This method can only be used for plastically deformable coatings such as paints, varnishes and fillers.

The test is carried out according to DIN EN ISO 2815.

Buchholz hardness tester with template is shown.
Buchholz hardness tester with template
A microscopic view of the imprint is shown as symbolic image.
Microscopic view of the imprint as symbolic image
The picture presents the Buchholz hardness tester with a template and the hand-held microscope for the examination of the indentation pattern.
Hand-held microscope for the examination of the indentation pattern

Manufacturer:

BYK Gardner GmbH

Model: 

PH - 5825