Four TUC FR-4 Materials Now Listed Under UL

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George Hsin, chief strategy officer of Taiwan Union Technology Corp. (TUC), has announced that the company now has four products listed as FR-15.1 in their UL file.

FR-15 listed products are FR-4 base materials that have tested to have 150°C electrical and mechanical relative thermal indices (RTI). The electrical and mechanical RTI is determined by the Long Term Thermal Aging program by UL. Recently UL has established a new definition FR-4 which extends the maximum operating temperature (MOT) from 130°C to 150°C.

TUC’s four products listed as FR-15.1 includes the TU-862 HF FR-15, TU-865 FR-15, the TU-862T FR-15, and the TU-863+ FR-15 (Thunderclad 1). These FR-4 type products all can be used in boards operating between 130°C and 150°C.

About TUC

TUC is a leading global developer and manufacturer of prepregs and laminates for the electronics industry. We provide materials that deliver solutions for present and future designs by partnering with our customers, as well as market-leading OEMs. We are committed to innovation and leading technologies while maintaining product manufacturability and unparalleled service and support. We provide superior global technical resources and a competitive edge to equip customers with solutions that generate extraordinary value. For more information, visit


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