Premium OEM/ODM Components Catalogue
For modern HVAC systems, industrial cooling units, and automotive fluid circuits, selecting between precision copper tubes and double-walled brazed Bundy tubes is critical to system integrity, life cycle optimization, and cost-efficiency. As high-pressure refrigerants like R410A, CO2 (R744), and eco-friendly R290 become standard, procurement teams face tougher requirements for burst strength, corrosion defense, and wall tolerance.
Bundy tubes, created by double-folding low-carbon steel strip through 360 degrees and copper-brazing it in a reduction furnace, offer exceptional resistance to vibration fatigue and high burst pressures. Meanwhile, copper tubing (specifically C12200 phosphorus-deoxidized copper) remains the gold standard for thermal conductivity, corrosion resistance, and ease of field manipulation. Taojun Refrigeration bridges the gap by manufacturing premium filtration and connection systems built on these metallurgy principles.
A National High-Tech Enterprise Leading in Refrigeration Accessories and Tubing Fabrication Since 1988
Ningbo Taojun Refrigeration Equipment Co., Ltd. is located in Xiangshan, Ningbo, a beautiful tourist city. Founded in 1988, its predecessor was the Xiangshan Refrigeration Accessories Factory of Zhejiang University. Our product lineup includes premium filter driers, check valves, air conditioning valves, condensers, brass and copper accessories, air conditioning cable ties, and specialized tubing systems.
After 30 years of hard work and rapid development, we are now a comprehensive enterprise integrating design, R&D, manufacturing, sales, and after-sales service. In 2021, Taojun was recognized as a National High-Tech Enterprise. With reliable engineering, certified quality, and dedicated after-sales support, our "Lingshan" brand has become a household name in domestic refrigeration accessories.
We are fully certified under ISO9001:2015, EU RoHS, and US UL standards, ensuring our products stand up to severe environmental and operational requirements worldwide.
Our original factory building was expanded to scale up raw copper processing and tooling capabilities.
Deployment of the MES intelligent workshop management system to tracks dimensional quality in real-time.
Integrated automated assembly lines for HVAC copper and Bundy tube components, achieving 0.05% defect rates.
Helping procurement engineers determine the ideal material substrate for high-vibration and high-thermal applications
| Parameters | C12200 Seamless Copper Tube | Double-Walled Brazed Bundy Tube |
|---|---|---|
| Primary Composition | Cu ≥ 99.90%, P: 0.015% - 0.040% | Low-Carbon Steel (SPCC/SAE 1008) + Copper Brazing |
| Thermal Conductivity | ~339 W/m·K (Excellent heat transfer) | ~54 W/m·K (Structural & moderate heat transfer) |
| Tensile Strength (UTS) | ≥ 220 MPa (Annealed temper) | ≥ 290 MPa (High mechanical toughness) |
| Standard Conformity | ASTM B68, ASTM B75, EN 12735 | ASTM A254, SPFC Series, JIS G3445 |
| Corrosion Treatment | Natural oxide layer / optional tinned plating | Zinc-coating, PVF coating, Olive Chromating, Epoxy |
| Primary Applications | Evaporator/Condenser coils, Capillary Tubes | Automotive Brake Lines, Refrigerator Static Condensers |
Note on Galvanic Corrosion Prevention: In components where copper and steel (Bundy) or aluminum interface—such as roll-bonded evaporators—our research team recommends a strict surface coating regimen (Zinc or PVF coatings) to prevent electrochemical breakdown at junction points.
Why Ningbo Taojun Delivers Cost Efficiencies and High Technical Standards Globally
Located in the industrial hub of Ningbo, we sit at the heart of China’s non-ferrous metal trading centers. This reduces shipping overhead and raw material lead times for cathode copper and steel strips.
Every batch of copper capillary filters and Bundy connection structures goes through computerized CCD visual sizing inspection, automated helium leak testing, and thermal aging tests (-35°C to 75°C for 500 hours).
Collaborating directly with the University of Science and Technology of China (USTC) and Zhejiang University, our engineers design flow models that minimize refrigerant noise and optimize flow dynamics.
How global system manufacturers implement our precision tubes and refrigeration elements
Our capillary copper tubing systems and copper molecular filter driers are key components in residential refrigerators and ice makers, absorbing moisture and acid to prevent capillary freezing.
Heavy-duty Bundy tube array condensers engineered to withstand environments like commercial display cases, industrial chillers, and large food storage facilities.
High-vibration resistant copper connecting lines paired with Taojun valves, engineered for split systems, multi-splits, and heat pumps using high-pressure R32 and R410A refrigerants.
To support global supply chains, we ensure our metal treatments meet specific market regulations. Whether it is compliance with the EU RoHS and REACH frameworks, or ensuring UL recognition for the North American market, Taojun structures its manufacturing processes accordingly.
Our surface finishes, including our trivalent zinc coatings and organic protective lacquers, are entirely free of hexavalent chromium (Cr6+), ensuring compatibility with automotive and appliance environmental standards worldwide.
Through our long-term supply agreements with global brands like Haier, Midea, Whirlpool, Electrolux, and Gree, we have optimized our lead times, container packing designs, and port logistics (Ningbo Port is only 2 hours away). This enables us to offer reliable delivery schedules for JIT (Just-In-Time) assembly facilities globally.
A visual walkthrough of our ISO 9001:2015 certified manufacturing facility
Our quality system is verified under CNCA (Registration No.: 41325Q00065R0S). This guarantees that from raw material acceptance through tube drawing, bending, cleaning, and testing, every process is documented and traceable.
Strict Quality System Metrics:
Main ISO Certificate
Detailed Certification Scope
Key technological shifts reshaping the copper and steel tube manufacturing landscape
Eco-friendly refrigerants require higher pressures. Traditional tubing systems are evolving to high-burst double-walled Bundy configurations and microgroove copper structures to support larger systems.
Modern compressor systems require ultra-clean environments. We implement multi-stage ultrasonic degreasing to keep internal residue within 10 mg/m².
Copper is 100% recyclable. We maintain a zero-waste manufacturing framework by redirecting all copper off-cuts and metal shavings back into the smelting cycle.
Addressing the technical, logistics, and material engineering questions asked by procurement teams
Explore More B2B Products
Taojun