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Superior Essex Formvar RW18HFJE Heavy Build Round Magnet Wire, 18 AWG, Copper, Natural, 24" Reel (PC24)

ID: RW18HFJE Mfr ID: RW18HFJE
Manufactured by: Superior Essex
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.
Special Handling Required



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  • Brand name :  Superior Essex
  • Trade Name :  Formvar
  • Series :  FORMPC_RD
  • Item Name :  Magnet Wire
  • Short Desc :  H FORMVAR 18 NAT SX 24"RL/PC24
  • Packaging :  24" Reel (PC24)
  • UNSPSC :  26121509

While Formvar has been replaced by GP/MR-200 and Nytherm in many applications, Formvar continues to be the recommended film insulation most commonly used in oil-filled transformers.

Design & Construction
Material Copper 
Color Natural 
Insulation Material Polyvinyl Acetal Coated 
NEMA Rating MW 18-C 
Shape Round 
General Features
Type Heavy Build 
Standards ASTM D2307 
Environmental Condition
Temperature Rating 105  deg C
Physical Properties
Wire Size 18 AWG 
Reel Diameter 14  Inch
Reel Weight 250  lb
Reel Width 6 Inch Inner x 8.75 Inch Outer 

Superior Essex Formvar RW18HFJE Heavy Build Round Magnet Wire, 18 AWG, Copper, Natural, 24" Reel (PC24) Technical Data Sheet 

Features :

  • Formvar is a synthetic film insulation containing polyvinyl acetal and phenolic resins. It has been in general use in the electrical industry as a class 105 deg C wire for over fifty years
  • Formvar magnet wire insulation exhibits high dielectric strength
  • Flexibility and adhesion properties of Formvar magnet wire film, because of its unique construction, excel in wire winding and roll flattening applications
  • Formvar is unsurpassed in its resistance to mineral oils. It is the best magnet wire coating available for these applications
  • Formvar magnet wire is a non-solderable product and must be mechanically stripped before soldering or terminated by means of insulation piercing terminals
  • Formvar easily passes 175 deg C heat shock

Applications :

  • For Oil-Filled Transformers, Motors, Random Wound Coils, Solenoids