• Weltweit führender Hersteller von
    hoch qualitativem metallisiertem Film
  • Weltweit führender Hersteller von
    hoch qualitativem metallisiertem Film
  • Weltweit führender Hersteller von
    hoch qualitativem metallisiertem Film
  • Weltweit führender Hersteller von
    hoch qualitativem metallisiertem Film
  • Weltweit führender Hersteller von
    hoch qualitativem metallisiertem Film
  • Weltweit führender Hersteller von
    hoch qualitativem metallisiertem Film
  • Weltweit führender Hersteller von
    hoch qualitativem metallisiertem Film

Metallized BOPP film

Steinerfilm® P is based on Biaxially Oriented PolyPropylene = BOPP film. This film is offered in various metallizing patterns and individual slit widths for highly customised capacitors and applications.

The molecule showing above is the base for all polypropylene materials. The specific arrangement of the molecules, the length of the chain and the orientation of  the  “ - CH3 “ branch separate today’s materials from other  PP-material. These films differ from other technical films due to the highest purity and the absence of additives like fillers or softeners.

A frequently asked key performance indicator for film capacitors is the specific capacitance. This ratio deals with the microfarad per volume and scales with one over thickness square. That pursues the target of the thinnest possible gauge.
The spectrum of film thickness is at the bottom end  of  all ”technical” films. The thickest OPP for capacitor application is about 20 µm ( = 0.020 mm ). Actually the thinnest commercially available gauge for an OPP film is about 1/13th of  this  e.g. 1.6µm  =  0.0016 mm !

Capacitors made with a 2 micron film give 5 µF/cm³.

The self-healing capability separates film capacitors from all other capacitor types. This finally ensures a high reliability and long life of these devices and safety in their applications.

Another key performance indicator for film capacitors deals with energy density. This ratio scales with volt per micron square. That pursues the target of a maximum electrical field stress even at high temperatures.

Steiner’s coating technique implements this in highly customised metallizing patterns that in parallel minimise the risk of excessive self-healing.

Tab.: Typical data for OPP-base

Density ρ0,91g/cm³
Melting point165°C
Long-term temperature range-60 - 100°C
Shrinkage in air md< 5%@ 120°C, 15 min
Shrinkage in air td< 1%@ 120°C, 15 min
Field strength in air DC≥ 600 V/µm@ 23°C
Field strength in air AC (50 Hz)≥ 350 V/µm@ 23°C
Loss factor tan δ <0,0002@ 1 kHz and 23ºC
Dielectric constant 2,2@ 1 kHz and 23ºC
Tensile strength md165 N/mm²@ 23°C
Tensile strength td208 N/mm²@ 23°C
Elongation at break md160%@ 23°C
Elongation at break td50%@ 23°C
Modulus of elasticity md2600 MPa@ 23°C
Modulus of elasticity td4600 MPa@ 23°C
Spec. resistance 10↑18 Ω cm@ 23°C
This difference of machine and transverse direction is typical for biaxially orientated plastic films.

This makes Steinerfilm® P a step ahead for a wide spectrum of  applications, starting with traditional  DC and  AC 50/60 Hz up to the latest so called DC link applications. These inverters/converters deal with high DC voltages plus a  high frequency AC ripple.