Kaladex® 2021L

Image of Kaladex® 2021L low shrinkage, one-side print treated, polyester PEN film

Kaladex® 2021L hazy, annealed polyester PEN film has one side pretreated for adhesion and offers improved shrink properties compared to Kaladex® 2000.

Kaladex® is a polyethylene-naphthalate (PEN) film manufactured by Mylar® Specialty Films (formerly DuPont Teijin Films™). Originally introduced in 1992, Kaladex® polyester PEN film is better equipped for harsh environment applications than traditional polyester PET and has many superior properties such as heat resistance, UV resistance, moisture and oxygen barrier, and more. 

It also serves as a cost-effective alternative to specialty engineered films like polyimides. Kaladex® is used in frontsheets, backsheets, and electrodes within solar cells, hi-fi speaker diaphragms, electrical insulation in high temperature environments like electric vehicle batteries, fuel cells, motors, capacitors, transformers, flat flexible cables, and flexible printed circuitry, and more.

Request a Quote or Sample

Select which type of product you would like a quote for


  • Kaladex® 2021L 1 mil (25 micron)


  • Strong heat resistance
  • Inherent screening of non-visible UV radiation below 380 nm
  • Excellent moisture and oxygen barrier properties
  • Good dielectric properties
  • Superior strength and stiffness
  • Low oligomer extraction
  • Anti-hydrolysis
  • Good chemical resistance
  • Superior dimensional stability and shrink resistance to Kaladex® 2000
  • One side print treated for adhesion

Typical Applications

  • Electrical insulation in high temperature environments
  • Solar cell frontsheets, backsheets, and electrodes
  • Automotive batteries & fuel cells
  • Hi-fi speaker diaphragms/cones
  • Thin film deposition substrate for electrodes and touch displays
  • High temperature motors, capacitors, and transformers
  • Flat flexible cables
  • Flexible printed circuitry
Data Sheets & Summary Sheets

Related Products

Search form