Shin-Etsu Launches KE-348 High-Performance Elastic Sealant, Redefining Industrial Bonding Standards

TOKYO, August 28, 2025 – Shin-Etsu Chemical Co., Ltd., a global leader in silicone technology, today announced the worldwide launch of its revolutionary KE-348 single-component room-temperature curing elastic sealant. Featuring proprietary "Unprimed Adhesion Technology", this breakthrough material delivers unprecedented sealing performance for electronics manufacturing, automotive engineering, and precision equipment industries.

A Century of Silicon-Based Innovation

As the world's largest silicone products manufacturer, Shin-Etsu boasts over 90 years of material R&D heritage. With more than 2,000 core patents, the company consistently provides foundational materials for high-tech sectors including semiconductors, renewable energy, and biomedical engineering. Holding the No.1 global market share in silicon wafers for 15 consecutive years, its specialty sealants have been designated as critical components by NASA, Tesla, and other cutting-edge institutions.

1. Revolutionary Bonding Process
   While conventional sealants require complex substrate pretreatment, KE-348 utilizes molecular-level surface penetration technology (Patent: SE-PCT/JP2023-04568) to form direct chemical bonding on metals, engineering plastics, and ceramics. Test data shows 0.90 MPa shear strength on aluminum alloy with 300% improved peel strength.

2. Smart Rheological Engineering
   Exceptional thixotropy (Thixotropic Index > 4.5) enables zero-sag application on vertical surfaces, while maintaining ultra-high elongation at break of 410% to absorb equipment vibration. Its thermal cycling resistance (-40℃ to 180℃) exceeds industry standards by 2.3x.

3. Electrical Insulation Revolution
   With volume resistivity of 10 TΩ·m, dielectric strength of 20 kV/mm, and dielectric constant of 2.5@50Hz, it is the ideal solution for new energy vehicle battery sealing and 5G base station circuit protection. Huawei Labs verification confirms 1000-hour endurance under 85℃/85%RH harsh testing.