TOBO Industrial (Shanghai) Co., Ltd., a leading manufacturer and global supplier of precision-engineered metal products, has announced the launch of its Copper-Nickel Alloy 3/8" AC Insulated Pancake Pair Coils, complemented by an integrated professional welding service for air conditioning and refrigeration installations. This comprehensive solution combines the superior corrosion resistance of copper-nickel alloy with factory-applied insulation and value-added fabrication support, addressing critical challenges in installation efficiency, system longevity, and on-site safety.
The Material Advantage: 90/10 Copper-Nickel Alloy (C70600)
The new product line is manufactured from UNS C70600 Copper-Nickel 90/10 alloy, a material that has demonstrated exceptional performance in marine and industrial environments for decades. The alloy's composition—approximately 90% copper and 10% nickel with controlled iron and manganese additions—delivers:
Superior Corrosion Resistance: Outstanding resistance to formicary corrosion ("ants' nest corrosion") caused by VOCs from insulation and building materials, as well as exceptional resistance to stress-corrosion cracking and pitting in coastal and industrial environments.
Enhanced Mechanical Strength: Higher tensile strength (typically 275-450 MPa) and superior resistance to vibration-induced fatigue compared to pure copper, critical for compressor discharge lines.
Natural Biofouling Resistance: The alloy's surface chemistry inhibits biofilm and mineral scale adhesion, maintaining heat transfer efficiency over time.
Proven Longevity: Service lives exceeding 30-40 years in challenging environments.
The Pancake Pair Coil Format: Efficiency by Design
The 3/8" copper-nickel tubes are factory-insulated and co-wound into a compact, flat pancake pair coil. This design delivers significant benefits:
Space Optimization: The flat pancake design reduces warehouse and service vehicle storage requirements by up to 60% compared to traditional round coils.
Installation Efficiency: Pre-insulated coils reduce installation time by up to 50%, with pre-paired liquid and suction lines at identical lengths eliminating measurement errors.
Factory-Applied Insulation: Consistent closed-cell foam insulation with thermal conductivity of 0.036-0.039 W/m·K eliminates variability and gaps common with field-applied insulation, preventing condensation damage.
Professional Welding Service: Complete Installation Support
TOBO complements the material supply with integrated welding services, including TIG (GTAW) welding for thin-wall tubing, orbital welding for high-purity applications, and silver brazing for standard refrigerant line connections. All welding procedures meet ASME Section IX requirements, with certified welders experienced in copper-nickel alloys and non-destructive testing available to validate joint integrity.
Industry Applications and Sustainability
The product serves residential and commercial air conditioning, mini-split and VRF systems, marine and coastal HVAC installations, and industrial refrigeration systems. The adoption of C70600 tubes aligns with sustainability objectives, offering extended service life, maintained efficiency, reduced leak risk, and 100% recyclability.
About TOBO Industrial (Shanghai) Co., Ltd.
TOBO is a professional manufacturer and exporter of precision-engineered metal products based in Shanghai, China, serving customers worldwide across HVAC/R, marine, energy, and industrial sectors with strict quality control and complete traceability.