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Extem UP Thermoplastic Polyimide

Extem UP Thermoplastic Polyimide

SABIC Innovative Plastics' flame-retardant Extem UP thermoplastic polyimide (TPI) resins are extreme high-heat materials that recently achieved a UL746B relative temperature index (RTI) rating of 240C by incorporating polyetheretherketone (PEEK) into its Extem resin. This unique blend technology opens opportunities for lower-weight, high-temperature continuous use applications such as semiconductor chip trays, connectors for harsh environments and metal replacement in high-heat oil and gas and aerospace environments.

Extem UP resins combine the best features of semi-crystalline PEEK, including excellent chemical and wear resistance and high flow, with the advantages of a high glass transition temperature amorphous material, including mechanical strength/stiffness, dimension stability and creep resistance at high temperatures. They meet UL746B requirements at an RTI of 240C, indicating retention of certain mechanical and electrical properties at this temperature over a period of 10 years.

SABIC says specific performance highlights are: up to five times greater flex strength and up to five times higher stiffness than unfilled PEEK at 200C; and dimensional stability expressed as a coefficient of thermal expansion (CTE) is up to 30 percent lower than unfilled PEEK. These performance properties allow customers to design parts with greater freedom and efficiency, achieve higher strength and stiffness using thinner walls to reduce material weight and costs, and provide tighter dimensional control for high-precision applications.

Extem UP resins are currently available as unfilled grades. Glass fiber-, mineral- and carbon-fiber-filled, as well as lubricated grades are now under development. The materials are an excellent candidate for conversion processes like injection molding and extrusion. Potential applications include semiconductor parts (seals, pick-up systems), electrical components (connectors, wire and cable), industrial parts (bearings, gears, bushings) and transportation composites and connectors.

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