Cleanup time and the risk of spillage are eliminated. The bondable resin is part of the magnet wire and not on other parts of the manufactured unit or the surrounding equipment and floor of the varnish area. Most products manufactured utilizing bondable magnet wire, possess greater bond consistency throughout, compared to varnished products. In addition, the finished unit is solidly bonded and may not require any external retaining device, forms, ties, or braces. Bonding occurs only in the areas where the wires are touching with adequate pressure to allow thermoplastic flow of the bondcoat polymer.
Disadvantages Using self-bonding also has some disadvantages.
Wire only bonds where there is intimate contact. Due to the thermoplastic nature of the bonding cements, the strength of the bond declines as the temperature of the cement approaches its softening point. Thus, bondable wire is not normally used in rotating equipment where, during overload conditions, rotary members can reach temperatures exceeding the softening temperature of the bondcoat cement. Common varnishes, however, also lose bond strength at elevated temperatures, as shown in bond strength comparison Graph 3. 3. Bondable coatings are softer than standard magnet wire insulations, and usually have a higher coefficient of friction and thus may not be suitable for some severe winding applications 4.