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 4 |
Min. Bare Wire Diameter |
N/A 0.2023 in5.138 mm |
Nom. Bare Wire Diameter |
N/A 0.2043 in5.189 mm |
Max. Bare Wire Diameter |
N/A 0.2053 in5.215 mm |
Min. Increase in Diameter Due to Film Coating |
N/A 0.0037 in0.094 mm |
Min. Overall Diameter of Film-Coated Wire |
N/A 0.2060 in5.232 mm |
Max. Overall Diameter of Film-Coated Wire |
N/A 0.2098 in5.329 mm |