Silicone adhesive for silicone rubber (Momentive)

Momentive's "TIA225GF" is a two-component addition reaction type liquid silicone material for heat dissipation. The main agent (Component A) and the curing agent (Component B) are mixed in a weight ratio of 1:1 and cured by heating (70°C for 0.5 hours) or at room temperature (23°C for 24 hours). After curing, it becomes a rubber-like elastomer with a thermal conductivity of 2.5 W/(m·K), forming an excellent heat path. This product is a liquid material with excellent thixotropic properties (shape retention), resulting in minimal dripping or smudging after application, making it easy to fill complex-shaped parts and gaps. It ensures stable thermal contact with high followability even on uneven bonding surfaces and narrow gaps, which are difficult to address with conventional thermal interface materials. By containing high-fill fillers, it achieves both high thermal conductivity and electrical insulation, making it suitable for applications requiring high reliability, such as power modules and communication boards.

"When in doubt about what to use, start with this" — The reason why this product continues to be chosen by field engineers In the manufacturing and research and development environments of electrical and electronic devices, there are many situations where silicone-based adhesives and sealants need to be selected. When multiple requirements overlap—such as needing heat resistance, wanting to avoid corrosion on certain metals, needing fast curing, or wanting to keep costs down—searching for a product from scratch each time is a waste of time. Many engineers likely have a trusted go-to product that they use when unsure. For many years, this position has been held by Momentive's TSE39×5 series (TSE3925, TSE3975, TSE3995). We will explain in detail, along with technical backing, why this series continues to be a bestseller in many fields.

Momentive's "TSE3975" is a one-component, moisture-curing, low-volatility silicone adhesive. It cures at room temperature by reacting with moisture in the air, forming a silicone rubber that combines flexibility and elasticity. Unlike the paste-type TSE3925 in the same series, TSE3975 is a flowable type. It maintains moderate flowability while being resistant to dripping, allowing for smooth filling and sealing of gaps and narrow spaces with complex shapes. The curing mechanism employs an alkoxy curing method, releasing alcohol-based vapors during the curing process. Unlike acetate types, it is non-corrosive to metals, making it particularly suitable for use in electrical and electronic devices that utilize various metal components such as copper, iron, aluminum, and stainless steel. It also meets the corrosion test of military standard MIL-A-46146B, ensuring reliability for applications that require high trustworthiness. In terms of adhesive performance, it demonstrates excellent adhesion to a wide range of substrates, including metals, various plastics, glass, and ceramics, without the need for a primer.

Momentive's "TSE3925" is a one-component, moisture-curing, low-volatility silicone adhesive. It cures at room temperature by reacting with moisture in the air, forming a silicone rubber that combines flexibility and elasticity. The product has a non-flowing paste-like consistency, making it resistant to dripping after application. It ensures minimal displacement during application on vertical surfaces, inclined surfaces, and uneven areas, providing stable workability. The tack-free time is approximately 5 minutes at 23°C, demonstrating excellent fast-curing properties that contribute to shortening processes in manufacturing lines and on-site work. In terms of adhesion performance, it exhibits excellent adhesion to a wide range of substrates, including metals, various plastics, glass, and ceramics, without the need for a primer. Additionally, the content of low molecular weight siloxanes is extremely low (0.028 wt%), making it safe for use in sensitive electronic components and sensor areas where siloxane gas may cause contact failure or contamination. For more details, please check our website.