Vacuum Impregnating of Wound-Copper Coils

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Endicott Coil Company, Inc. produces vacuum impregnated wound copper coils for customers who need to protect their coil from the environment as well eliminating moisture from the coil. Because this process requires little tooling it can be a cost-effective alternative to molding or encapsulating. We place the wound copper coils in a vacuum pressure impregnation tank, which removes the air and moisture and replaces it with a varnish or epoxy impregnant. We matched the resin to customer requirements for a variety of properties, such as chemical resistance, moisture resistance and dielectric characteristics. The process also required curing the pieces in a temperature controlled oven.

These coils are subject to stringent quality processes that included gage dimensioning as well as Hipot and surge testing as well as produced to tolerances of ±0.005″. To learn more about this project or how our vacuum impregnated wound copper coils can improve your next project, contact us today.

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Highlights of Vacuum Impregnating Wound-Copper Coil Project

Product Description

These Coils are Vacuum Impregnated to Guard the Coil from Environmental Conditions

Vacuum Impregnation Capabilities Applied/Processes


  • Design/Product Development
  • Vacuum Impregnating


  • Baking
  • Spray Painting
  • Sanding
  • Dip Varnishing
Equipment Used to Manufacture Part
  • VPI Tanks – Both Heated and Non-Heated
  • Temperature Controlled Baking Ovens
Overall Part Dimensions

2.734″ Length x Ø 2.375″ Diameter

Tightest Tolerances

± 0.005″

Material Used
  • Viking: C1525A, V1630FS, C1525F35
  • John C. Dolph: AC-41, AC-43, BC-346, EB-41,CC-1118, BC-352
  • Dow Corning: 997 Varnish
  • P. D. George: 434-CC
In process testing/inspection performed
  • Dimensional Gage Test
  • Shorted Turns Test
  • Hipot Test
  • Surge Test
Industry for Use
  • Marine
  • Automotive
  • Transportation
  • Electronics
Standards Met
  • Customer Specifications
  • 2D CAD Drawing
  • VDE
Product Name

Impregnated Coils

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