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
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
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 23 |
Min. Bare Wire Diameter |
N/A 0.0224 in0.569 mm |
Nom. Bare Wire Diameter |
N/A 0.0226 in0.574 mm |
Max. Bare Wire Diameter |
N/A 0.0227 in0.577 mm |
Min. Increase in Diameter Due to Film Coating |
N/A 0.0010 in0.025 mm |
Min. Overall Diameter of Film-Coated Wire |
N/A 0.0234 in0.594 mm |
Max. Overall Diameter of Film-Coated Wire |
N/A 0.0243 in0.617 mm |
