Conical Mandrel Test Apparatus
The conical mandrel may be used to determine properties of a coating; its resistance to cracking and/or detachment from its substrate and its elongation during the test. It is also known as standard method for assessing the flexibility and the adhesion properties of coatings when these are subjected to bending stresses This is accomplished by bending the test material around a conically shaped metal bar. The mandrel bending test is a commonly used testing for coated panels.
It is suitable for use with metal panels from to 0.3mm thick to 4.5mm thick (flexible substrates up to 5mm thickness) e.g. polythenes or synthetic rubber. The apparatus consists of a steel mandrel 203mm in length and tapering from 38mm to 3mm in diameter. It will accommodate test panels up to 19cm x 11cm in size. A graduated scale on the clamping bar indicates the mandrel diameter at which failure has occurred. When this diameter is added to the thickness of the panel used, the percentage elongation can be calculated. Conical mandrel detects common failures of coating shows cracking or flaking after bending. Can be used in accordance with DIN ISO EN 6860, ASTM D 522, BS 3900 E11, DIN 53150