Reliable sealing of silver pins for automotive connectors

July 22, 2020 //By Christoph Hammerschmidt
Reliable sealing of silver pins for automotive connectors
Adhesives manufacturer DELO GmbH has introduced a light- and humidity-curing sealant for connectors for use in vehicle control units or sensors. DELO Dualbond GE4918 offers good pin sealing properties, increases connector life, and allows efficient production.

For highly reliable connectors, automotive suppliers generally use silver coated connector pins since they are more cost-efficient than gold and more reliable than copper. The silver is given an additional passivation layer to protect it from tarnish and abrasion. This coating is usually based on mercaptan and has been considered difficult to bond – until now.

DELO Dualbond GE4918 has been optimized for reliable sealing for these types of pins. It not only adheres excellently to the mercaptan coating, but also adheres to the typical connector housing materials PA and PBT, even under the stringent conditions of the automotive sector. Since this new sealant is flexible in the cured state, it also compensates for the different thermal expansions of metal pins and plastic housings. It offers very good temperature resistance, up to +150 °C, and is able to keep the connectors tight after thermal shock tests ranging in temperature from -40 °C to +150 °C.

The material at hand enables fast and simple production processes with a high level of safety. According to the vendor, the single-component product is easy to dispense, shows good flow properties, and can be fixed in 10 to 20 seconds with the help of high-intensity UV light. In shadowed areas that cannot reached by light, a second curing mechanism allows the adhesive to cure under the influence of air humidity. An in-line tightness test can be performed immediately after UV light fixation.

With this sealant, automotive suppliers can benefit from its silicone-like properties without having to take special precautions in their production, as is the case with silicones. The outgassing of silicone often leads to contamination of other processes, which is particularly undesirable in painting or coating processes.

DELO Dualbond GE4918 is available for sampling.

More information: https://www.delo-adhesives.com/en/company/


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