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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
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 40

Min. Bare Wire Diameter

N/A 0.0030 in0.076 mm

Nom. Bare Wire Diameter

N/A 0.0031 in0.079 mm

Max. Bare Wire Diameter

N/A 0.0032 in0.081 mm

Min. Increase in Diameter Due to Film Coating

N/A 0.0003 in0.008 mm

Min. Overall Diameter of Film-Coated Wire

N/A 0.0032 in0.081 mm

Max. Overall Diameter of Film-Coated Wire

N/A 0.0037 in0.094 mm