Steinerfilm® E is based on a biaxially oriented polyethylene naphthalate; better known by its abbreviation PEN.
This film is offered in various metallizing patterns and individual slit widths for highly customised capacitors and applications.
The molecule shown above is the basis for this film. The complex structure of these macro molecules differentiates this film from other materials.
The PEN film making process also uses additives, so-called nanoparticles of a certain corn size and distribution, to generate the surface structure.
This finally makes the film surface looking like a PET film and the stoichiometric affinity of the molecule puts the electrical character also in the neighbourhood of polyester.
- PEN performs electrically like PET but with a higher mechanical and thermal level
- PEN is inert against moisture at high temperatures
- the lower shrinkage versus temperature and a high melting point makes the film compatible for a reflow soldering process
Typical data for PEN
| Density ρ | 1,36 | g/cm³ |
| Melting point | 266°C | |
| Long-term temperature range | <175°C | |
| Shrinkage in air md | <1,5% | @ 150°C, 30 min |
| Shrinkage in air td | <1,1% | @ 150°C, 30 min |
| Field strength in air | 250 - 350 V/µm | @ 23°C |
| Loss factor tan δ | <0,005 | @ 1 kHz and 23ºC |
| Dielectric constant | 2,9 | @ 1 kHz and 23°C |
| Tensile strength md | 160 - 190 N/mm² | @ 23°C |
| Tensile strength td | 175 - 220 N/mm² | @ 23°C |
| Elongation at break md | 25 - 50% | @ 23°C |
| Elongation at break td | 25 - 40% | @ 23°C |
| Modulus of elasticity md | 4800 - 4900 MPa | @ 23°C |
| Modulus of elasticity td | 5200 - 5500 MPa | @ 23°C |
| Spec. resistance | 2*10↑17 Ω cm | @ 23°C |
| This difference of machine and transverse direction is typical for biaxially orientated plastic films. | ||