Bimetal washers to prevent bimetallic galvanic electro-corrosion at copper and Aluminium joints.

 
 What is Copal Bimetal?
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 Bimetal at transition joints?
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 as a transition plate 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.
 
 Committed to quality
Established in 1978, We have been of the forefront in the manufacture of bimetals and tri-metals. Equipped with the most modern machines and sophisticated testing equipment's, we ensure perfect quality and excellence performance of our products.
Over these years we have earned the confidence of reputed original equipment manufacturers, utilities and projects. The continuous patronage of these giants in the field is a testimony to the quality and performance of our products.
 
 Towards tomorrow
With the expertise and experience gained over the past years, We look forward to meeting the challenges of tomorrow with hope and confidence.
 
Applications Include The Following
Substation & Switchyard Bimetallic clamp and connectors
Cable lugs and cable end connectors
Distribution, panel boards, bus ducts and bus bar chambers
Bus ducts and bus bar chambers
Isolators and switchgears
Oil & Vacuum Circuit Breakers
Overhead connectors
  Flexible connectors
Technical Specification
Property Units Copal/Cupal
Purity
          Aluminium
          Copper

% min
% min

99.00
99.90
Standard Composition   80:20 85:15
          By Volume

          By Weight
Copper %
Aluminium %
Copper %
Aluminium %
20
80
45
55
 15 
85
40
60
Density at 200C
gms/cm3
3.95
3.40
Max electrical resistivity at 200C
µΩ/cm
2.6
2.8
Min electrical conductivity at 200C
% IACS
65
63
 
In addition Copal is subject to various other mechanical test such as bend test, erichen cup test and reversible bending test.
 
CUPAL BIMETAL
 
Bimetal at Aluminium Copper joints
 
Bimetallic joints in Busways or Busducts
 
Copal Cupal in Electrical distribution systems
 
CUPAL at Cable Lugs joints
 
CUPAL at Bimetallic Connectors
 
 
 
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