UMICORE SEALING 691 EL Protection for Technical Precious Metal Surfaces Umicore Sealing 691 EL is a perfect all-rounder to protect technical precious metal surfaces including electrical contacts. The coefficient of friction will be reduced enormously, the sliding performance of connectors will be improved, and even under strong mechanical stress, the functional layer is protected for much longer. In addition, Umicore Sealing 691 EL prevents tarnishing and discolouring. Silver surfaces treated with Umicore Sealing 691 EL as a final layer produce outstanding results in K2S tests. There are no disadvantages in using Umicore Sealing 691 EL: Electrical characteristics are unchanged, and solderability and contact resistance are unaffected. In addition, Umicore Sealing 691 EL is easy to use: either in a simple dipping process or by electrolytic application for very short contact times in reel-to-reel plating. Finally, Umicore Sealing 691 EL is free of chromium and doesn’t contain environmentally harmful substances like CFCs, CHCs and HCs. • Especially developed for technical components like electrical contacts • Very short treatment times, making it suitable for reel-to-reel plating • Long-lasting protection against tarnishing and discolouration • Easy to use, both electrolytic and dipping process • Free of components like CFCs, CHCs, HCs and chrome • No influence on colour or brightness of the finished coating • Increased sliding performance, reduced insertion force • Provides high reliability in K2S test, therefore a perfect protection for silver lay

UMICORE SEALING 691 EL TECHNICAL SPECIFICATIONS Electrolyte characteristics Coating characteristics Aqueous, metalfree passivation Weakly acidic to neutral pH value Operating temperature Immersion time Rack/barrel Reel-to-reel Anode material Umicore Sealing 691 Reduces Friction Forde Friction Marks After 500 Friciton Cycles Sliding properties Contact resistance < 10 mΩ Protected parts remain bondable Stable Contact Resistance Dip Time vs Contact Resistance at Contact Normal Force 50 cN on silver Pure silver without sealing COF: 0.76 Pure silver with Umicore Sealing 691 COF: 0.04 Electrolyte type...