Reliable sealing of silver pins in automotive connectors

The sealing of the connector must be strong and reliable to protect the electronics from moisture, media or corrosion. Automotive suppliers often use silver-plated r connector pins because silver is less expensive than gold and more reliable than copper. A passivation layer is attached to the outside of the silver to prevent dark rust and wear. This coating is usually based on mercaptan. Mercaptan has hitherto been regarded as a difficult material to bond. However, the DELO DUALBOND GE4918 is optimized to reliably seal this type of pin. It not only adheres to mercaptan coatings, but also to the connector housing materials PA and PBT, both of which are commonly used in the harsh automotive industry. The new sealant is flexible in the cured state and compensates for the different thermal expansion of metal pins and plastic housings. It has an excellent high-temperature resistance of up to +150 °C. It is also very resistant to high temperatures in multiple thermal shock tests. In addition, the connectors remain robust after several thermal shock tests in the temperature range of -40 °C to +150 °C. The new sealant has a very good adhesion to the metal pins and the plastic housing in the cured state.

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