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  • Round Magnet Wire
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.

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Item #

AWG Size

Nom. Bare Wire Diameter

Min. Increase in Diameter Due to Film Coating

Max. Overall Diameter of Film-Coated Wire

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N/A 50 N/A 0.00099 in0.0251 mm N/A 0.0002 in0.005 mm N/A 0.0014 in0.0356 mm
N/A 48 N/A 0.00124 in0.0315 mm N/A 0.0002 in0.005 mm N/A 0.00170 in0.0432 mm
N/A 47 N/A 0.00140 in0.0356 mm N/A 0.0003 in0.008 mm N/A 0.0019 in0.0483 mm
N/A 46 N/A 0.00157 in0.0399 mm N/A 0.0003 in0.008 mm N/A 0.0021 in0.0533 mm
N/A 45 N/A 0.00176 in0.0447 mm N/A 0.0004 in0.001 mm N/A 0.0024 in0.0610 mm
N/A 44 N/A 0.002 in0.051 mm N/A 0.0004 in0.010 mm N/A 0.0027 in0.069 mm
N/A 43 N/A 0.0022 in0.056 mm N/A 0.0004 in0.010 mm N/A 0.0029 in0.074 mm
N/A 42 N/A 0.0025 in0.064 mm N/A 0.0004 in0.010 mm N/A 0.0032 in0.081 mm
N/A 40 N/A 0.0031 in0.079 mm N/A 0.0006 in0.015 mm N/A 0.0040 in0.102 mm
N/A 39 N/A 0.0035 in0.089 mm N/A 0.0006 in0.015 mm N/A 0.0045 in0.114 mm
N/A 38 N/A 0.004 in0.102 mm N/A 0.0007 in0.018 mm N/A 0.0051 in0.130 mm
N/A 37 N/A 0.0045 in0.114 mm N/A 0.0008 in0.020 mm N/A 0.0057 in0.145 mm
N/A 36 N/A 0.0050 in0.127 mm N/A 0.0008 in0.020 mm N/A 0.0063 in0.160 mm
N/A 35 N/A 0.0056 in0.142 mm N/A 0.0009 in0.023 mm N/A 0.0070 in0.178 mm
N/A 34 N/A 0.0063 in0.160 mm N/A 0.0010 in0.025 mm N/A 0.0078 in0.198 mm
N/A 33 N/A 0.0071 in0.180 mm N/A 0.0011 in0.028 mm N/A 0.0088 in0.224 mm
N/A 32 N/A 0.0080 in0.203 mm N/A 0.0012 in0.030 mm N/A 0.0098 in0.249 mm
N/A 31 N/A 0.0089 in0.226 mm N/A 0.0013 in0.033 mm N/A 0.0108 in0.274 mm
N/A 30 N/A 0.0100 in0.254 mm N/A 0.0014 in0.036 mm N/A 0.0119 in0.302 mm
N/A 29 N/A 0.0113 in0.287 mm N/A 0.0015 in0.038 mm N/A 0.0133 in0.338 mm
N/A 28 N/A 0.0126 in0.320 mm N/A 0.0016 in0.041 mm N/A 0.0147 in0.373 mm
N/A 27 N/A 0.0142 in0.361 mm N/A 0.0016 in0.041 mm N/A 0.0164 in0.417 mm
N/A 26 N/A 0.0159 in0.404 mm N/A 0.0017 in0.043 mm N/A 0.0182 in0.462 mm
N/A 25 N/A 0.0179 in0.455 mm N/A 0.0018 in0.046 mm N/A 0.0203 in0.516 mm
N/A 24 N/A 0.0201 in0.511 mm N/A 0.0019 in0.048 mm N/A 0.0227 in0.577 mm
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