Flexibility / Elasticity

In practice, three different empirical test procedures are used to assess the resistance of coatings and allied products to cracking and/or detachment from the substrate under different conditions of deformation.

Bend Test

Bending lacquered sheet metal over a defined radius allows an indication of the elongation and adhesion of a paint film due to bending stress.

The DIN EN ISO 1519 standard only permits the use of cylindrical mandrels.
The ASTM D 522 and the DIN EN ISO 6860 standards describe the test method by means of a conical or cylindrical mandrel.
The use of a conical mandrel bending tester enables testing of a large variety of bending radii at the same time.