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 19 |
Min. Bare Wire Diameter |
N/A 0.0355 in0.902 mm |
Nom. Bare Wire Diameter |
N/A 0.0359 in0.912 mm |
Max. Bare Wire Diameter |
N/A 0.0361 in0.917 mm |
Min. Increase in Diameter Due to Film Coating |
N/A 0.0025 in0.064 mm |
Min. Overall Diameter of Film-Coated Wire |
N/A 0.0380 in0.965 mm |
Max. Overall Diameter of Film-Coated Wire |
N/A 0.0391 in0.993 mm |