Formvar is a synthetic enamel composed of polyvinyl acetal and phenolic resins.
Formvar's hot oil resistance sets it apart from all other magnet wire insulations. The flexibility, adhesion and abrasion scrape resistance of Formvar film is excellent. Its electrical properties are very good and it is resistant to common solvents. While Formvar has been replaced in many applications, Formvar continues to be the recommended film insulation most commonly used in oil-filled transformers.
Typical Applications
For Use in Guitar Pickups
Formvar serves as an excellent choice of winding wire for pickup manufacturing companies and is chosen for it's resistance to common solvents (including sweat and other liquids that can find its way into a guitar's pickup). Heavy Formvar is used where top end brightness and note definition are desired, due to fewer windings than with thinner wire with more windings.
Formvar's hot oil resistance sets it apart from all other magnet wire insulations. The flexibility, adhesion and abrasion scrape resistance of Formvar film is excellent. Its electrical properties are very good and it is resistant to common solvents. While Formvar has been replaced in many applications, Formvar continues to be the recommended film insulation most commonly used in oil-filled transformers.
Typical Applications
- Oil-filled transformers
- Motors
- Random wound coils
- Solenoids
- Guitar Pickups
For Use in Guitar Pickups
Formvar serves as an excellent choice of winding wire for pickup manufacturing companies and is chosen for it's resistance to common solvents (including sweat and other liquids that can find its way into a guitar's pickup). Heavy Formvar is used where top end brightness and note definition are desired, due to fewer windings than with thinner wire with more windings.
Unit of Measure
Specifications
UL Listing |
N/A UL Recognized Class 105 Product |
Mil-Spec No. |
N/A MW 15-C/A |
AWG Size |
N/A 28 |
Min. Bare Wire Diameter |
N/A 0.0125 in0.318 mm |
Nom. Bare Wire Diameter |
N/A 0.0126 in0.320 mm |
Max. Bare Wire Diameter |
N/A 0.0127 in0.323 mm |
Min. Increase in Diameter Due to Film Coating |
N/A 0.0016 in0.041 mm |
Min. Overall Diameter of Film-Coated Wire |
N/A 0.0141 in0.358 mm |
Max. Overall Diameter of Film-Coated Wire |
N/A 0.0147 in0.373 mm |