San Antonio, TX. SABIC is introducing here at APEC 2018 a new 7-µm ULTEM UTF120 polyetherimide (PEI) dielectric film for high-temperature capacitor applications. This advanced new material targets increasingly higher voltage applications that require thicker film with greater storage capacity. The new 7-µm ULTEM UTF120 film is the second product in a planned portfolio of high-performance SABIC dielectric films featuring different thicknesses to help meet customers’ specific voltage requirements. SABIC, which launched a 5-µm ULTEM UTF120 film last year, said it is the only materials supplier offering extruded PEI film at these thicknesses.
“Our new 7-µm ULTEM UTF120 PEI film is yet another example of how SABIC is continuing to invest in next-generation film technologies for power electronics that can meet tough, ever changing electrical application challenges,” said Stephanie Gathman, director, emerging applications, SABIC. “It also underscores the commitment to our customers by illustrating our ability to understand their needs and address evolving market trends—such as the move to wide-bandgap semiconductors. We aim to deliver products that can support a full range of capacitor voltages and energy densities.”
To share industry trends driving development of this new material, SABIC application development technical specialist Neal Pfeiffenberger, Ph.D., is giving a talk at APEC 2018. He will speak on “ULTEMTM UTF120 High Temperature Dielectric Film for Capacitor Applications” on Wednesday, March 7, at 12:00 p.m.
The new 7-µm ULTEM UTF120 PEI dielectric film enables the design of lightweight, compact, high-energy-density capacitors that can store large amounts of electrical energy for long periods without significant current leakage or loss of charge at high temperatures. This technology can offer proven advantages for capacitor applications, beginning with dielectric and insulative properties. It also maintains low heat loss at target frequencies.
In the event of breakdown caused by excessive voltage, the new ULTEM film is self-healing, which allows the capacitor to continue functioning. These self-healing properties surpass those of polyphenylene sulfide (PPS), a competitive and lower-performing high-heat material.
With a temperature range of -40 to 150°C, ULTEM UTF120 film exceeds the temperature performance of commodity capacitor materials such as polypropylene (PP) and polyethylene terephthalate (PET) film, making it potentially suitable for demanding applications such as DC/DC converters and electric compressors for electric vehicles. Because the ULTEM UTF120 film can handle higher temperatures, it can reduce or eliminate the need to actively cool converter capacitors by way of a secondary source. Cooling loops, for example, traditionally used to reduce temperatures for PP and PET film capacitors, take up precious under-hood space and can constrain design flexibility. Additionally, capacitors using ULTEM UTF120 film are also capable of passing industry-standard 260°C reflow soldering processes.
SABIC 7-µm ULTEM UTF120 film also provides excellent handling through metallization, capacitor winding, and flattening (squashing), the company said. It can be processed on existing equipment and has been validated with both film-foil and metalized electrodes, including flat, tapered, and patterned metalized electrode designs.
SABIC’s ULTEM UTF120 film portfolio is commercially available worldwide and is on display at the company’s booth for the duration of APEC 2018.