To manufacture high-quality industrial products, manufacturers must strictly control raw material standards from the very beginning. A good raw material must have reliable origins, proper processing, and excellent purity.
The refined copper material used by Ruby Copper meets all these requirements and plays a critical role in producing high-quality copper tubes for global markets.
What Is Copper Cathode?
As commonly taught in chemistry, the anode is the positive electrode while the cathode is the negative electrode in the electrolysis process.
During electrolysis, oxidation occurs at the anode surface, causing metal atoms to lose electrons and become positively charged ions. These ions move through the electrolyte solution toward the cathode. At the cathode surface, reduction occurs, allowing the metal ions to gain electrons and deposit as pure metal.
Based on this principle, copper cathode — also known as electrolytic refined copper — is a highly pure copper product refined through electrolysis.
The final product forms on the cathode surface inside the electrolytic refining tank.
Pure copper has a reddish-orange color, a density of approximately 8.94 g/cm³, and copper content that satisfies international standards. These products are typically manufactured into sheets of around 1 square meter with rough surfaces and packed into bundles weighing approximately 2.2–2.4 tons.
How Copper Cathode Is Produced
Copper ore and copper scrap are first transported to copper smelters for processing.
The raw materials then undergo multiple production stages using specialized equipment, including:
- Ore crushing
- Ore concentration
- Matte smelting
- Blister copper refining
- Electrolytic refining
- Anode copper casting
Through these complex stages, copper purity gradually increases from around 5–8% in raw ore to approximately 99.5% in anode copper plates.
However, this purity level is still insufficient for international refining standards. To produce high-purity refined copper, the anode plates must undergo a final electrolytic refining process.
In this stage, a thin sheet of high-purity copper serves as the cathode, while the less refined anode plate acts as the positive electrode.
When direct current passes through the electrolyte solution, Cu²⁺ ions released from the anode move toward the cathode and are reduced into pure copper metal.
During this process:
- The anode gradually dissolves
- The cathode becomes thicker with pure copper deposits
- Impurities settle at the bottom of the tank as anode sludge
The final product removed from the cathode side is the refined copper material used by modern copper tube manufacturers.
Why Does Ruby Copper Only Use Copper Cathode?
Copper tubes are widely used in:
- Air conditioning systems
- Refrigeration systems
- Water supply systems
- Gas transportation
- Transportation industries
- Medical gas systems
Many of these applications require extremely pure copper materials to ensure safety, durability, and long-term performance.
If copper contains excessive impurities, electrochemical corrosion can occur more rapidly, shortening the lifespan of the copper tube and affecting system reliability.
Therefore, using high-quality refined copper is essential for minimizing harmful impurities and ensuring product safety.
Ruby Copper understands the importance of premium raw materials and exclusively uses Grade 1 copper cathode with a minimum copper purity of 99.9% according to international copper trading standards.
Where Does Ruby Copper Source Copper Cathode?
Ruby Copper carefully evaluates all suppliers through a strict approval process based on the following criteria:
- World-class product quality
- Strong international reputation
- Large-scale production capacity
The selected suppliers are consistently ranked among the world’s top refined copper manufacturers and are listed on the London Metal Exchange (LME), the world’s leading marketplace for base metal futures and options trading.
By sourcing premium raw materials from globally recognized producers, Ruby Copper ensures stable quality, high purity, and reliable performance for all copper tube products.
Conclusion
Copper cathode is one of the most important raw materials in copper tube manufacturing. Its high purity directly affects product quality, durability, and safety across industrial and HVAC applications.
By using only premium-grade refined copper, Ruby Copper maintains strict international quality standards and delivers reliable copper tube solutions for customers worldwide.
