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PRODUCTS -- COPAL Bimetal washers to prevent bimetallic galvanic electro-corrosion at copper and Aluminium joints. What
is Copal? Copal consists of copper (sheet metal) cladded on pure Aluminium (base metal), both metals being diffused together to form an inseparable whole by roll bonding process. Copal, is therefore not and alloy and copper layers are not Electro plating but are rather mechanically welded Aluminium sheets. Why
Copal? It is known that when the Aluminium Terminals are directly connected to Copper Terminals to carry current at a high voltage, a bimetallic galvanic corrosion occurs, resulting in a high resistance at the joint. The heated joints are oxidized and loses contact resulting in sparks, voltage dropout power losses and failure, damage to machinery. When Copal bimetal is placed between Aluminium Terminal and Copper Terminal at the joint (with Copper facing Copper and Aluminium facing Aluminium), bimetallic galvanic corrosion is averted due to absence of air in COPAL bimetal. COPAL is thus used at dissimilar metals joints of Aluminium and Copper to make similar metal's contact. COPAL has been successfully evaluated and used by many of the world's leading electrical equipment manufacturers. Applications
Include The Following
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