Automotive

The revolutions in electrification and autonomy are creating a growing demand for highly reliable automotive electronic components – and a need to optimise every aspect of component design and manufacture. Answering this challenge, Henkel has developed an innovative solution for silicone liquid gasketing for the next generation of automotive electronic components.

Loctite SI 5972FC is a one-part RTV silicone form-in-place-gasket (FIPG) solution that accelerates the process of electronic module sealing. With adhesion to a range of metal and plastic surfaces, the highly dispensable liquid silicone material has been specifically designed to pass OEM’s leak or blow-out pressure tests immediately after assembly – minimising the need for time and space-intensive staging.

Through its tin-free catalyst and alkoxy curing system, this 1-component dispensable silicone material provides a REACH compliant approach to sealing electronics. By avoiding the need for curing ovens, Loctite SI 5972FC also helps manufacturers reduce energy usage and carbon emissions.

Module sealing is an essential final stage in the assembly process. While liquid silicone gasketing solutions have proved a versatile option that can address multiple configurations without the inventory challenges and manual assembly required by traditional rubber O-rings, the room temperature vulcanisation (RTV) curing process can be time-consuming. To meet stringent OEM pressure testing, post assembly staging to achieve a full cure can take several days. This not only prolongs cycle times but also consumes precious floor space in the manufacturing environment.

Thanks to its unique design, Henkel states that Loctite SI 5972FC can pass a 3 psi leak test immediately after assembly. Even higher leak test pressures can also be passed in relatively short periods. In addition, the material’s non-corrosive outgassing and low volatility makes it ideal for sensitive electronic components. Recommended applications include electronic control units (ECU), bussed electric centres (BEC), battery disconnect units (BDU), electrical power steering (EPS) power packs, and ADAS components.  

“Today, it is vital to fully understand the impact of materials used in a component – whether this relates to the impact on manufacturing efficiency or the risks to human or environmental safety. Loctite SI 5972FC has been created to help manufacturers address this spectrum of challenges,” explains Arthur C. Ackerman, business development manager automotive electronics at Henkel.