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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
  • 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 20

Min. Bare Wire Diameter

N/A 0.0317 in0.805 mm

Nom. Bare Wire Diameter

N/A 0.0320 in0.813 mm

Max. Bare Wire Diameter

N/A 0.0322 in0.818 mm

Min. Increase in Diameter Due to Film Coating

N/A 0.0023 in0.058 mm

Min. Overall Diameter of Film-Coated Wire

N/A 0.0340 in0.864 mm

Max. Overall Diameter of Film-Coated Wire

N/A 0.0351 in0.892 mm