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SAFE partners with Intercept Technology to offer affordable Tarnish Protection for your coins and medals
In comparison tests with other methods of corrosion protection, Intercept Technology has been proven clearly the most effective of all those available today. Intercept Technology® is a Lucent Technologies (foremerly Bell Labs) patented and licensed polymer process. The Technology has been licensed, manufactured, distributed, and sold by licensees since 1991. In order to ensure the highest quality production, samples of production materials are regularly retained and tested. These checks, coupled with periodic inspections and updated improvements in formulations create a technically advanced product. Periodically, final products are laboratory tested for static and/or corrosion protection performance.
Intercept Technology is designed to protect copper, silver and their alloys from tarnishing. These metals are commonplace in the electronic equipment Lucent Technologies manufactures. Therefore, it is beneficial for Lucent Technologies to test their performance of such systems so as to expand our information base in the matter of the atmospheric corrosion protection of electronic materials.
Storage systems for coinage have been tested for corrosion protection from atmospheric trace sulfur gases. Intercept Technology significantly outperformed non-Intercept Technology products.
Copper, silver and their alloys have been degraded from atmospheric gases from the moment they were purified and polished more than 5,000 years ago. The most abundant corrosive gas is oxygen.
Upon exposure to oxygen copper forms an oxide film of Cu2O, which, is semitransparent, and self limiting. This oxide grows to approximately 15Å in one hour to an upper limit of approximately 2 NM at 20° C2.
Typical copper degradation occurs when sulfur and water vapor are deposited on the metal surfaces. Liquid water, sufficient to form an acidic condensate slurry with sulfur, occurs at relative humidity levels greater than 60%. This slurry penetrates and breaks protective oxide interstitial grain boundary bonds. Eventually, sulfur and copper ions form copper sulfide, which, mix into the oxide, and form directly on the copper surfaces. In very thin layers an overall darkening will occur at thicknesses as low as 10 nm3.
Typically, experiments used to mimic these natural occurring processes utilize water and a corrosive gas. We have chosen this proven method to evaluate product performance. The gas we wish to use as a catalyst for the test is hydrogen sulfide. It is abundant in the atmosphere. It has a natural vapor pressure of 292 psi at STP, is colorless, and it has an affinity for reacting with copper having a chemical stoichiometry favoring a Cu reaction as does carbonyl sulfide and three to four times more than So2.Intercept Technology ® is a Lucent Technologies patented and licensed polymer process. The Technology has been licensed, manufactured, distributed, and sold by our licensees since 1991. In order to ensure the highest quality production, and manufacture of Intercept products are maintained, samples of production materials are regularly retained and tested. These checks, coupled with periodic inspections and updated improvements in formulations create a technically advanced product. Periodically, final products are laboratory tested for static and/or corrosion protection performance.
The evaluation of Intercept Technology ® encompassed equivalent 10 year sulfurous atmospheric trace gas corrosion testing followed by optical evaluation, scanning electron microscopy, and x-ray elemental analysis. This generic testing and evaluation was designed to demonstrate the protection ability of material packages in reference to corrosive atmospheric sulfur trace gases and their reactions with copper, silver, and their alloys. The test results show the tested Intercept Technology products offer a considerable increase over other non-Intercept protective products.