HV Coils

HV Coils
Resin coils.

Sacrifice Shrink Film for Resin Rich Coils

Armor Insulation

Shrink Film Armor Insulation

High Voltage Coil Consolidation & Sacrifice Film


The compression force characteristics of Hi-Shrink Tape make it an effective and useful tool for consolidating and compacting resin rich or B-staged materials during cure. In addition, the tape can be used for compressing, debulking, shaping, forming and banding various materials.

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Application Examples & Case Studies

Tedlar replacement coils

Sacrifice Films for HV Coils


High Voltage Motors and Generators


Large OEM in the power generation industry looks to cost reduce their current release film.


Current film is expensive to use as a sacrifice layer and provides very little compaction when heated during the press cycle. Low compression force can lead to poor insulation consolidation and improper shaping of the corner radii on the HV coils. 

Dunstone Solution

Dunstone F-Series Hi-Shrink Tape with PVF Release


The OEM was able to use Dunstone’s F-Series Tape 210F as the first layer of release film instead of the film currently used. Hi-Shrink Tape 210F is a polyester based shrink film, with 10% shrink, which has a fused coating of Tedlar® on one side for release. The product provides the high temperature release characteristics of Tedlar®, combined with the high shrink force of polyester film at an overall lower cost. 

Other applications for Dunstone tapes on high voltage coils

  • Heat shrinkable release film on resin rich insulation for DC Field Poles
  • Heat shrinkable release film on pre-consolidated coils

Case Study End Winding Insulation for HV Coils