Precision-engineered solutions featuring durable copper piping, high-efficiency condensers, and standard fittings directly from Taojun manufacturing line.
The science of high-pressure refrigerant containment and metallurgy certifications for commercial HVAC/R design.
In modern industrial and residential HVAC/R configurations, the refrigerant R410a represents a pivotal shift towards higher heat transfer rates, but it carries a significant challenge: it operates at pressures up to 1.6 times higher than older gases like R22. This high-pressure environment demands copper tubing that exhibits uncompromising integrity, superior mechanical properties, and strict dimensional tolerances. As a leading high-tech manufacturer, Ningbo Taojun Refrigeration Equipment Co., Ltd. (formerly Xiangshan Refrigeration Accessories Factory of Zhejiang University) has pioneered key innovations in the production of C12200 deoxidized high phosphorus (DHP) copper tubing since 1988, ensuring that high-pressure operations remain safe, energy-efficient, and leak-free for a lifespan exceeding 20 years.
To safely sustain operating pressures that regularly peak at 4.3 MPa (623 psi) in cooling mode, manufacturing engineers must calculate the minimum wall thickness ($t$) of copper tubing using Barlow's Formula: $P = 2St / D$, where $P$ represents the burst pressure, $S$ the allowable stress of the copper temper, and $D$ the outside diameter of the tube. At Taojun Refrigeration, we maintain a wall thickness tolerance limit within ±0.02mm. This precision eliminates localized wall thinning, preventing structural failures or catastrophic refrigerant leaks in high-temperature discharge lines.
To ensure global compatibility, all our R410a copper tubing products adhere strictly to ASTM B280 (Standard Specification for Seamless Copper Tube for Air Conditioning and Refrigeration Field Service) and EN 12735-1 specifications. These guidelines define grain size parameters (typically kept between 0.015 mm and 0.040 mm) to ensure optimal ductility for bending and flaring without cracking, as well as strict carbon residue limit of less than 0.038 g/m² to prevent internal oil contamination.
| Nominal Size (Inches) | Outside Diameter (mm) | Standard Wall Thickness (mm) | Working Pressure (R410a) | Min. Burst Pressure (MPa) | Typical Application Scenarios |
|---|---|---|---|---|---|
| 1/4" | 6.35 | 0.80 | Up to 4.3 MPa | 28.5 MPa | Liquid Line for Residential Mini-Splits |
| 3/8" | 9.52 | 0.80 | Up to 4.3 MPa | 18.2 MPa | Multi-split VRF connecting loops |
| 1/2" | 12.70 | 0.85 | Up to 4.3 MPa | 14.8 MPa | Gas/Suction Line, Mid-range commercial A/C |
| 5/8" | 15.88 | 1.00 | Up to 4.3 MPa | 13.6 MPa | Heavy Commercial Heat Pump installations |
| 3/4" | 19.05 | 1.00 | Up to 4.3 MPa | 11.2 MPa | High-capacity Industrial chiller linking lines |
Established in 1988, Ningbo Taojun Refrigeration Equipment Co., Ltd. has developed deep technical partnerships with the University of Science and Technology of China (USTC) and Zhejiang University. Our R&D center features 15 highly specialized engineers, including doctors and professors, focusing on material physics, thermal dynamics, and pressure-seal technologies.
We deploy advanced imported manufacturing equipment from Germany and utilize an integrated MES (Manufacturing Execution System) to guarantee complete batch traceability. Our continuous eddy current testing (ECT) scans 100% of finished lines to flag micro-defects down to ±10 microns before shipping.
Why sourcing your R410a copper tubing and HVAC parts from Ningbo Taojun ensures lower TCO and maximum reliability.
Located in Xiangshan, Ningbo, our facility is less than 90 km from the Ningbo-Zhoushan Port, the world's busiest port by cargo tonnage. This location minimizes domestic freight costs and simplifies container dispatching, guaranteeing rapid delivery cycles to European, American, and Middle Eastern markets.
We source raw copper cathodes directly from certified smelters. We also process copper pipes, U-bend fittings, and filter driers under one roof. This integration prevents external margins from inflating costs, allowing us to offer highly competitive pricing structures for wholesale volume contracts.
Designated as a national high-tech enterprise in 2021, Taojun leverages national policy incentives to continually upgrade production infrastructure. Our facilities feature advanced helium leak testing booths and MES-connected production parameters, maintaining a defect rate of under 500 PPM.
Meeting requirements for high-capacity projects, industrial OEMs, and international distributors.
Procurement departments at global HVAC brands like Haier, Gree, Whirlpool, and Electrolux require more than off-the-shelf catalog products. They need customized copper configurations that fit seamlessly into their assembly line robots. Taojun Refrigeration addresses this demand by offering tailored copper accessories, custom-shaped U-bends, and specialized filter driers matching proprietary designs.
Our manufacturing capacity is optimized to handle high-volume demands while remaining flexible enough to support customized small-batch orders with a low Minimum Order Quantity (MOQ) starting at 500 units. For global distributors, we provide flexible shipment plans, including straight lengths, pancake coils, and pre-insulated pipe coils. This packaging features highly durable, UV-resistant cross-linked polyethylene (PE) insulation, which minimizes thermal transfer loss in long-run commercial VRF line sets.
Perfect for residential mini-split installation. Highly flexible, easy to bend manually without wrinkling, and available in lengths from 15m (50ft) up to 50m. All ends are sealed via plastic caps to prevent dust and humidity contamination.
Designed for commercial piping systems where straight, rigid spans are required. Delivered in standard 5.8m or 6m lengths to fit directly into sea containers without bending or deformation.
Utilizes multi-layer elastomeric foam insulation with embossed UV-resistant outer skins. Meets global construction flammability codes, including ASTM E84 Class A, preventing condensation along the piping path.
Ensuring trouble-free customs clearance and building code approvals across key global markets.
Building codes vary significantly between North America, Europe, and Asia. Importing construction materials requires strict compliance certificates to protect importers from legal liabilities and customs delays.
In line with modern sustainability demands, Ningbo Taojun has introduced fully recyclable plastic end-caps, biodegradable cardboard casing, and eco-friendly protective sleeves. Our manufacturing process minimizes material waste via computerized nesting systems and collects 100% of copper scrap for certified closed-loop recycling. This approach aligns your supply chain with global decarbonization initiatives.
Staying ahead of changes in refrigerant technologies and processing techniques.
The global HVAC/R market is currently undergoing a structural phase-down of high-GWP (Global Warming Potential) HFCs like R410a, driven by the Kigali Amendment. The industry is transition towards low-GWP alternatives such as R32, R454B, and natural refrigerants like CO2 (R744) and Propane (R290). This transition impacts copper tubing requirements in two ways:
Natural CO2 cycles operate at transcritical pressures exceeding 12 MPa (1740 psi). This requires specialized copper-iron alloys (such as C19400) or much thicker C12200 tubes. Taojun's R&D team is actively testing high-tensile copper alloys to support transcritical CO2 chiller networks.
To maximize heat transfer efficiency in eco-friendly systems, we utilize inner-grooved micro-fin technology. Spiral micro-grooves inside the tube increase the internal surface area, boosting heat transfer coefficients by up to 30% compared to smooth bore tubes.
Where Taojun's R410a copper tubing and HVAC parts perform under pressure.
Ideal for multi-zone residential ductless splits. Our flexible pancake coils allow installers to navigate tight structural spaces in homes without requiring elbow joints, reducing the risk of installation leaks.
Commercial variable refrigerant flow systems involve long horizontal and vertical piping runs. Taojun's straight-length hard tubes maintain structural alignment over long spans, reducing sag and improving refrigerant flow stability.
Used heavily in food display cabinets, Walk-in freezers, and industrial ice makers. Designed to resist corrosion from humidity and cleaning agents, ensuring constant system uptime.
Ningbo Taojun Refrigeration: A reliable partner backed by ISO certificates and rigorous quality audits.
Ningbo Taojun Refrigeration Equipment Co., Ltd. is located in Xiangshan, Ningbo. Established in 1988, our product range includes filter driers, check valves, access valves, condensers, brass and copper accessories, and air conditioning cable ties. Over 30 years of development, we have grown into a comprehensive manufacturer integrating design, production, and after-sales service. In 2021, Taojun was recognized as a national high-tech enterprise.
With an unwavering pursuit of quality, our filters and accessories have become well-known brands across domestic and international markets. The company holds ISO9001:2015 quality management system, EU RoHS environmental, and US UL certifications. We focus on customer needs to deliver stable and efficient supply chains.
ISO 9001 Certificate
Detailed Scope Document
Zhongci Quality Verification
National High-Tech Certificate
Building trust through decades of innovation, honesty, and cooperative development.
Our original factory building expanded to meet growing demand from China's domestic refrigeration brands, upgrading tooling lines for automated tube cutting and copper processing.
Introduced the MES intelligent workshop management system, enabling real-time monitoring of raw material copper compositions, tube drawing tolerances, and batch testing data.
Taojun upgraded its production facilities, introducing automated visual alignment robots, helium mass spectrometer leak detectors, and green manufacturing processes to prepare for low-GWP refrigerant lines.
A global brand is sustained by its corporate culture. At Taojun, we drive business growth through: Honesty, Innovation, Responsibility, and Cooperation.
Find expert answers to common queries regarding R410a copper tubing and procurement policies.
R410a operates at pressures up to 60% higher than R22 (peaking at ~4.3 MPa under standard condensing limits). Standard R22 tubing with thinner walls risks bursting under these conditions. To prevent structural failure, code specifications like ASTM B280 mandate thicker walls for copper tubing used in R410a systems.
Our R410a copper tubing is made from C12200 Deoxidized High Phosphorus (DHP) copper, containing a minimum of 99.9% pure Copper (Cu) and a Phosphorus (P) content between 0.015% and 0.040%. This alloy offers excellent weldability, ductility for bending and flaring, and resistance to hydrogen embrittlement.
Yes, we provide full support for OEM/ODM customization. We can adjust the outside diameter, wall thickness, coil lengths, and bend configurations according to your engineering drawings. Our automated extrusion and CNC pipe bending equipment ensures precise control, matching a minimum order volume of 500 units.
We perform continuous online eddy current testing (ECT) during extrusion to identify internal cracks. Finished products undergo high-pressure hydraulic tests, thermal shock tests (cycling from -35°C to 75°C for 500 hours), vacuum drying to eliminate residual moisture, and helium-leak verification to guarantee zero leakage.
We are located near Ningbo Port, allowing us to manage ocean freight and customs processing efficiently. We issue complete documentation portfolios, including Mill Test Certificates (MTC), ISO 9001 compliance logs, Certificate of Origin documents, and safety compliance paperwork to ensure trouble-free clearance in your home port.
Explore our extended catalog of high-efficiency cooling fans, mounting brackets, control systems, and quick adapters.
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