Uyemura, a leader in specialty surface technologies, has introduced Topseal 693, a silver anti-tarnish conversion coating.
This high-performance inorganic sealant withstands high heat and high voltages without compromise of resistivity. Contact resistance is low: <10 m W with contact force >5 cN. The thin, invisible layer of Topseal 693 does not affect surface energy or the reactivity of pure silver.
Topseal 693 is an aqueous immersion process that is compatible with both rack and barrel application. It is free from CFCs, CHCs, HCs, chromium and thiols. It is non-foaming, and exceptionally suitable for high-speed processing.
Uyemura says parts treated with Topseal 693 maintain their original brightness and color. They are also bondable, with good adhesion characteristics. The inherent high solderability of silver is fully retained.
The company says Topseal 693 is exceptionally well suited for applications including connectors used in charging systems, large buses, and technical components such as contacts.
The process is available throughout North America exclusively from Uyemura. For details, or to arrange test processing, contact Rich DePoto, sales@uyemura.com. Visit www.uyemura.com
