- 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.
- Impact Test – “Falling-weight Test”
Impact Tester
* Consists of a solid base with a guide tube support
* The guide tube has a slot to direct a weight that slides inside
the guide tube
* A collar fits on the tube that helps the user slide the weight
up to the accurate height
* Graduations are marked along the slot to facilitate readings
Procedure
* Place sample under the punch
* Lift the weight to desired height on guide tube and let it drop
* View the damage of the sample visually or with low powered
magnification
* Adjust the height and weight of the impacter to determine
exact point of failure or establish pass/fail specifications
* Cupping Test
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