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A further property of materials and their coatings is their hardness. Hardness is determined as a Vickers reading in a range of test forces from 10 g to 1000 g to DIN EN ISO 6507 and DIN EN ISO 4516 for micro-indentation tests.
Layer hardness can be determined both on the cross-section edge and perpendicular to the surface. However, measurement on the cross-sectional edge is often unavoidable because surface roughness makes measurement of the indentations perpendicular to the surface impossible.
Tensile tests are used to determine the strength and deformation characteristics of materials using loads applied in a uniaxial direction, uniformly spread over the cross-section in accordance with DIN EN ISO 6892-1.
The specimen is uniformly and smoothly drawn until it ruptures.
Profile method for determining the surface finish and standard characteristics to DIN EN ISO 4287 and DIN EN ISO 4288.
The surface of the specimen being examined is traced with a diamond-tipped needle. The vertical displacement of the needle is recorded by a path measurement system and the computer produces a 2D profile.
The objective is to determine key roughness values such as arithmetic mean surface roughness Ra, or the surface roughness depth Rz, maximum surface roughness Rmax or other standardised characteristics, depending on the application.
Determining the abrasion resistance of various materials using a TABER® Rotary Platform Abrasion Tester or Taber Abraser. Suitable for metals, paint finishes, lacquer and paint coatings and galvanic coatings.
The abrasive action is generated by a pair of discs that are pressed onto the revolving specimen with a defined force. The surface is processed isotropically. Evaluation is normally carried out on the basis of weight loss. However, it is also possible to evaluate the results based on the depth of the abraded track e.g. by measuring the profile by means of the profile method or evaluation of the resistance of the coating to through-abrasion.
Evaluation of adhesive strength and extensibility of electrochemical coatings and dry paint finishes on thin test panels in accordance with DIN EN ISO 1519.
Method 1. As a "pass/fail" test, by bending the coated substrate several times around a single specified size of mandrel. After a predefined number of test bends, the extent to which the coating has separated from the substrate or flaked off is assessed and thus whether the requirements have been met.
Method 2. Repeated tests using successively smaller mandrels to determine the diameter of the first mandrel over which the coating cracks and/or becomes detached from the substrate.