DuPont Teijin Films is the leading supplier of PET and PEN thin films for capacitor dielectrics. Our unique thin film stretching process gives our films a special balance of mechanical properties and thermal shrinkages which makes them the films of choice for both wound and stacked capacitors. In addition this special stretching process minimises surface defects and leads to fewer voltage breakdown events in the finished capacitor.
DuPont Teijin Films supplies three types of films for capacitor dielectrics:
Mylar® film capacitors are used in a wide range of applications where their smaller physical size than other filmic material capacitors makes them ideal for miniaturisation of devices such as mobile phones etc. Mylar® polyester film can be readily metallised or can be combined with layers of aluminium foil to produce wound and stacked capacitors as well as SMD capacitors. The ability of metallised Mylar® polyester film to 'self heal' should there be any localized breakdowns gives an advantage for higher voltage applications. DuPont Teijin Films produces a wide range of Mylar® polyester films tailored to individual capacitor types to ensure the maximum performance in use.
In situations where a higher service temperature is required Teonex® Q71 and Teonex®Q72 films are often used. Typical applications are in lead free soldered SMD capacitors and automotive lighting.
TEONEX® HV - The new High Temperature Dielectric for Power Capacitors
DuPont Teijin Films has developed Teonex® HV film which provides a dielectric with a high service temperature and highest energy density compared to all current materials. In addition when metallised it has excellent self healing properties. Potential Teonex® HV applications are high temperature power applications such as DC link in EV/HEV automotive and avionics, industrial energy conversion and renewable energy.