Shengyi Technology Earns UL Listing for FR-4 with RTI of 150°C


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For over 50 years, printed circuit applications using FR-4 as a base material were limited to 130°C continuous maximum operating temperature (MOT). This was more a definition limit set by UL and ANSI rather than a lack of thermal performance by the FR-4 products. Recently, UL changed the definition to allow FR-4 to be used at temperatures up to 150°C if the long term thermal aging (LTTA) data passed the electrical and mechanical requirements.  

Shengyi is the first base material supplier world-wide to have an FR-4 product listed with an electrical and mechanical Relative Thermal Index (RTI) of 150°C. The product, S1170G, is a halogen-free epoxy system with a Tg of 180°C and a Td of 390°C designed for lead-free processing. The excellent CAF resistance allows S1170G to be used for high reliability applications including automotive, smartphone, and consumer electronics

The product is listed in Shengyi’s UL File # E109769 as an ANSI Grade FR-15.1. FR-15.1 indicates that it is a halogen-free FR-4 product with RTI of 150°C.

Board designers can feel more comfortable knowing that S1170G can be used at higher   temperatures than for traditional FR-4s. Other current FR-4 products will also be listed as

FR-15 in the Shengyi UL file as customer requirements dictate.

About Shengyi Technology Company Ltd.

Based in Dongguan since 1985, Shengyi Technology Co., Ltd. (SYTECH) is a world leader in the development and production of laminates and prepregs. The company maintains a high commitment to on-going R&D efforts and provides a complete portfolio of products ranging from composites to high reliability, thermal management, HSD and RF/PTFE laminate materials. Shengyi maintains a state-of-the-art manufacturing facility in Dongguan where it manufactures FR4, CEM-1, CEM-3 and a variety of Prepregs. In addition, the company maintains laminate and prepreg manufacturing operations in Suzhou, Shaanxi and Changshu. Shengyi’s products are used in single-sided, double-sided and multilayer printed circuit boards and the company’s global customer base spans a broad spectrum of markets including mobile phones, automotive, telecommunication equipment, computers and higher-level electrical products. For more information can be found here

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