For over 50 years, printed circuit applications using FR-4 as a base material were limited to 130 degrees C continuous Maximum Operating Temperature (MOT). This was more of a definition limit by UL and ANSI rather than a lack of thermal performance. Recently UL changed the definition to allow FR-4 to be used up to 150 degrees C if the Long Term Thermal Aging (LTTA) data passed the electrical and mechanical requirements.

Shengyi is the first base material supplier worldwide to have an FR-4 product listed with an electrical and mechanical Relative Thermal Index (RTI) of 150 degrees C. The product, S1170G, is a halogen-free epoxy system with a Tg of 180 and a Td of 390 degrees 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 degrees 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. More information about the company is available at

For more information about Shengyi US visit:

Scarlet Wang
Shengyi Technology Company Ltd.:
office: +86-22271828-2204
mobile: +86 133 8010 0970

Product Information Contacts:
Fred Hickman
VP of OEM Marketing North America
Shengyi Technology Co., Ltd., (SYTECH)
Phone: 602-722-4053