Hiram, OH: 440.834.7500   Duncan, SC: 864.486.8700
Shrink Film

Polyshrink and Freebond Shrink/Release Films

for processing high voltage coils and composites.

Polyshrink and Freebond shrink and release films are custom designed to optimize compaction forces during the cure cycle of high voltage coils and electrical composites. Before selecting the correct film, thickness, or shrink percentage, Electrolock must first understand your composite structure. The goal is to apply the correct compaction force to the part during the cure cycle, increasing resin flow and reducing voids in the finished part.

We offer multiple materials including but not limited to:

  • PET (Polyethylene terephthalate)
  • FEP (Fluorinated ethylene propylene)
  • PI (Polyimide)
  • ETFE (Ethylene tetrafluoroethylene)
  • OPP (Oriented polypropylene)

Polyshrink films are supplied with our proprietary “non-silicone” release coating on one or both sides of the film, ensuring an easy release off of the cured high voltage coil or part.

Freebond films are made uniquely to bond to themselves during a cure cycle while still capable of acting as a release film on the part.

Need to Place an Order, Request a Sample or Datasheet?


Call OH Office: 440.834.7500

Call SC Office: 864.486.8700

Building success from the inside out.


  • Percent: 5% – 20%
  • Orientation: Machine Direction


  • Thickness: 0.001 in – 0.005 in (0.025 mm – 0.125 mm)
  • Width: 0.5″- 18″+
  • Length: 32-1200+yards
  • Core Size: 1″, 1.5″, 55mm, 3″


  • Non-release coated
  • Release coated 1 side
  • Release coated 2 sides
  • Perforated
  • Perforated w/release

Cure Temperature

  • 160°C to 400°C (film dependent)

Superior Processing Aid for Composite and Resin Products

Customers expect high-quality products that not only perform to specifications but look nice to the end-user. Electrolock’s expertise in providing custom electrical solutions is reflected in our family of shrink and release films – PolyShrink and Freebond. PolyShrink and Freebond Films make an incredible difference in the manufacturing of high voltage coils, or other electrical composites. These films are critical to producing a stronger end product with a fine, smooth finish.

How do they work?

PolyShrink and Freebond Films provide a compaction force when heated by shrinking. The goal is to apply the correct compaction force to the part during the cure cycle. These films not only protect the product during curing but the shrinking compresses the product which ensures good resin flow and eliminates air voids in the finished part. After curing, the films are easily removed with our proprietary “non-silicone” release coating. The end result is a high strength, resin-rich finish.

Tailored Applications

We have the right film for your application needs. We take a hands-on approach to first understand your composite structure and its environment during manufacturing. This allows us to select the correct film for your part with the right thickness and shrink percentage. Additionally, our films come in a variety of release coatings, perforations, and multiple release sides.

We Can Handle the Heat

One of the most critical variables in the curing process is the cure temperature. We have our customers covered with our PolyShrink and Freebond Films. Customers can choose from PET, FEP, Polymides, and other films to match the cure temperature of your part. All of our films are designed and manufactured at our plant in Hiram, Ohio.

Give us a call to learn more about our family of PolyShrink and Freebond films & to request a sample.

A Final Solution You Can Count On

Every manufacturing system consists of manufacturing methods, materials, operators, and equipment. How these system components work together can make a huge difference in the quality of coils, motors, and generators your company produces.

Electrolock can help you identify the insulation materials that will work best in your process. We can also help improve your methods in order to produce a premium high voltage insulation system. Whether you’re using vacuum pressure impregnation, resin-rich technology, or vacuum and pressure autoclave system, call us to help you design the best high voltage insulation system for your application.

Need to Place an Order, Request a Sample or Datasheet?


Call OH Office: 440.834.7500

Call SC Office: 864.486.8700