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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
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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

MWRD17SF N/A 17 N/A 0.0453 in1.151 mm N/A 0.0014 in0.036 mm N/A 0.0475 in1.207 mm
MWRD195SF N/A 19-1/2 N/A 0.0339 in0.861 mm N/A 0.0012 in0.030 mm N/A 0.0358 in0.912 mm
MWRD21SF N/A 21 N/A 0.0285 in0.724 mm N/A 0.0011 in0.028 mm N/A 0.0303 in0.770 mm
MWRD23SF N/A 23 N/A 0.0226 in0.574 mm N/A 0.0010 in0.025 mm N/A 0.0243 in0.617 mm
MWRD25SF N/A 25 N/A 0.0179 in0.455 mm N/A 0.0009 in0.023 mm N/A 0.0194 in0.493 mm
MWRD26SF N/A 26 N/A 0.0159 in0.404 mm N/A 0.0009 in0.023 mm N/A 0.0173 in0.439 mm
MWRD31SF N/A 31 N/A 0.0089 in0.226 mm N/A 0.0006 in0.015 mm N/A 0.0100 in0.254 mm
MWRD32SF N/A 32 N/A 0.0080 in0.203 mm N/A 0.0006 in0.015 mm N/A 0.0091 in0.231 mm
MWRD33SF N/A 33 N/A 0.0071 in0.180 mm N/A 0.0005 in0.013 mm N/A 0.0081 in0.206 mm
MWRD34SF N/A 34 N/A 0.0063 in0.160 mm N/A 0.0005 in0.013 mm N/A 0.0072 in0.183 mm
MWRD38SF N/A 38 N/A 0.004 in0.102 mm N/A 0.0003 in0.008 mm N/A 0.0047 in0.119 mm
MWRD39SF N/A 39 N/A 0.0035 in0.089 mm N/A 0.0003 in0.008 mm N/A 0.0041 in0.104 mm
MWRD40SF N/A 40 N/A 0.0031 in0.079 mm N/A 0.0003 in0.008 mm N/A 0.0037 in0.094 mm
MWRD41SF N/A 41 N/A 0.0028 in0.071 mm N/A 0.0002 in0.005 mm N/A 0.0033 in0.084 mm
MWRD42SF N/A 42 N/A 0.0025 in0.064 mm N/A 0.0002 in0.005 mm N/A 0.0030 in0.076 mm
MWRD44SF N/A 44 N/A 0.002 in0.051 mm N/A 0.0002 in0.005 mm N/A 0.0024 in0.0610 mm
MWRD45SF N/A 45 N/A 0.00176 in0.0447 mm N/A 0.0002 in0.005 mm N/A 0.00220 in0.0559 mm
MWRD46SF N/A 46 N/A 0.00176 in0.0399 mm N/A 0.0002 in0.005 mm N/A 0.00200 in0.0508 mm
MWRD50SF N/A 50 N/A 0.00099 in0.0251 mm N/A 0.0001 in0.003 mm N/A 0.00120 in0.0305 mm
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