Mandrel Winding Tester

Mandrel winding (or mandrel bend) testing is a mechanical test used to evaluate how well an enamelled wire can withstand being bent or wound around a cylindrical or conical rod (the mandrel) without cracking, flaking, or losing adhesion. It is widely used for quality control of enamelled wires, paints, organic coatings, and metallic or galvanized layers on substrates that will be bent or wound during manufacturing or use.

Basic idea

• A mandrel is a rigid cylinder or cone over which a coated or wrapped specimen is bent or wound under controlled conditions.​

• The surface is then examined for visible cracking, flaking, or detachment; the smallest mandrel diameter that causes no damage defines the acceptable bend or winding limit.​

Typical applications

• Evaluating flexibility and adhesion of enamel on metalic wires.​

• Checking adherence of enamel coatings (e.g., galvanized wire) by winding the wire around a mandrel and inspecting for spalling or peeling.​

• Assessing whether a coating will survive later forming operations such as bending, rolling, or winding in automotive, construction, and appliance manufacturing.​

What the test reveals

• Flexibility/elongation: How much the coating can stretch or compress during bending before failure.​

• Adhesion strength: Whether the coating stays bonded to the substrate under bending stress.​

• Maximum safe bend radius: The minimum mandrel diameter around which the product can be bent or wound without coating damage.​

If you want to read more specific information about our Mandrel winding Testers please click here to read the datasheet on MW2 and here to read the datasheet on MW,MW1.

For further information please contact our sales department.