Metallized special films
Steinerfilm® S has become a synonym for metallized and/or customised film where the base film used is neither OPP nor PET.
Polytetrafluorethylene (PTFE is better known as Teflon)
Polytetrafluorethylene (PTFE) is well-known as a heat resistant material.
Teflon has the highest density of all plastic materials. The commercial thickness range starts from 12µm.
Teflon is surprisingly "soft" and can only be wound at a relatively low winding tension despite it's thick gauges.
Polyimide, PI (better known as Kapton)
Polyimide, PI (Kapton) is well-known as a heat resistant material.
The complex Imid-molecules arrange either linear or cyclic.
The commercial spectrum of thickness starts from 12µm.
Polyetherimide (PEI) film
PEI is known as ULTEM by company SABIC, metallised by Steinerfilm.
ULTEM™ film UTF120 is a high heat and high energy density dielectric film that meets the most stringent technical demands for use in professional-grade dielectric film capacitors up to 150°C.
Polyetherketone consists of two basic molecular groups “ x” & “y”. It is well-known as a heat resistant material.
This material is meanwhile established in various non electrical applications where the temperature exceeds the limits of traditional plastics like OPP and PET.
PEEK, a Poly Ether Ether Ketone, is one of the first candidates of this group of materials that has been tested as a dielectric for capacitors. PEEK and PAEK are known by company Victrex.
The thinnest gauge is about 6µm with thinner gauges under development but not yet available.