The main difference is the chemical composition, and the electrical performance is higher. Also, depending on the grade:

• Grain Size – OC-ETP ® has a smaller grain size.
• Hardness – OC-ETP ® is a harder
• Tensile Strength – OC-ETP ® is tougher

One possible negative effect of the above three items could be ‘Orange Peel’, a minor cracking in the copper surface during the bending that could affect the current flow/power flow.

OC-ETP® vs. Cu-OF, we use a Spectrometer to determine the difference of copper purity in materials. OC-ETP® has a slightly higher Oxygen content than Cu-OF.

Cu-OF does not have Oxygen in the copper, should basically have higher purity and therefore, its conductivity should be higher than OC-ETP®.

However, due to the proper production process for OC-ETP®, it achieves equivalent conductivity to Cu-OF, but with superior mechanical properties.

Cu-OF is suitable as straight Bar or can only be bended through annealing process which will alter the original mechanical properties resulting in the less strength of the Bus Bar.

OC-ETP® vs. Cu-Other – The less purity 0.02% of Cu-Other reduces conductivity due to a critical the impurity elements in the copper. The cost saving of purchase is only 1 % while the resulting watt loss is as high as 12 % which impacts on the whole service life of the Bus Bars.

No, the brightness and shininess are the result of the reduction of material after cold drawing.