Product owner: National Bank of Kazakhstan
Increased Efficiency, Safety or Environmental Protection
Bi-colored (composite) coin is made with the use of tantalum, the metal which is widely used in the space industry. Over coin production the technology of change of color of tantalum is applied. Bi-colored (composite) coin has the round form consisted of the concentric situated ring and disk. In particular attraction Tantalum for using in coin and token production resides in its features. It comes second only to Tungsten and Rhenium on low fusibility (fusing temperature is about 3000°С). High strength and hardness combine in it with perfect plastic characteristics. Pure Tantalum is plastic as gold, it is machined well, easily pressed, treated into the thinnest plates. Valuable feature of Tantalum is exceptional chemical durability: for that matter it is second only to precious metals even not always. Tantalum is not dissolved even in such a chemically aggressive medium like chlorotic acid which easily dissolves Gold, Platinum and other precious metals.
Notably Improved Quality of a Product or Process
The internal disk of coin is made of tantalum, with application of technology of changing color on purple, an external ring from silver.