Can copper die castings be used in refrigerant-based systems?
Can Copper Die Castings Be Used in Refrigerant-Based Systems?
Suitability of Copper Die Castings in Refrigerant Environments
Yes, copper die castings are well-suited for use in refrigerant-based systems such as air conditioners, chillers, and heat pumps. Copper alloys like C12200, C11000, and C18200 offer excellent thermal conductivity, corrosion resistance, and compatibility with common refrigerants including R-134a, R-410A, and CO₂. These properties make copper castings ideal for components exposed to both thermal cycling and pressurized refrigerant environments.
Key Performance Advantages
High Thermal Conductivity Copper alloys provide thermal conductivity between 320–400 W/m·K, ensuring efficient heat transfer in evaporators, condensers, and thermal interfaces.
Corrosion and Pitting Resistance Alloys such as C12200 (phosphorous-deoxidized copper) resist hydrogen embrittlement and internal oxidation, making them suitable for brazed joints and sealed refrigerant loops.
Pressure Compatibility Cast copper components offer excellent pressure handling for use in sealed refrigeration systems. With proper wall design and post-machining, fittings and manifolds can withstand pressures exceeding 3.5 MPa.
Common Applications in Refrigerant Systems
Expansion valve housings
Heat exchanger headers
Compressor inlet/outlet fittings
Refrigerant manifolds and coupling blocks
Brazed connections in split systems
Alloy Recommendations for Refrigerant Exposure
Alloy | Refrigerant Compatibility | Key Feature |
|---|---|---|
C12200 | R-134a, R-410A, CO₂ | Excellent weldability and corrosion resistance |
C11000 | All refrigerants | Maximum thermal transfer efficiency |
C18200 | High-temperature systems | High strength and arc resistance |
Compliance and Testing Standards
Neway ensures refrigerant system components meet the following:
ASTM B124 / B584 – Casting standards for copper alloys
ISO 14903 – Refrigerant leakage and pressure testing
UL 207 – Safety standard for refrigerant-containing components
All fittings and housings are pressure-tested and leak-checked before delivery.
Customer-Oriented Copper Solutions for HVAC and Refrigeration
Neway Die Casting delivers precision-engineered copper parts for demanding refrigerant-based systems:
Copper Die Casting: High-performance alloys tailored for pressure and thermal cycling.
Post-Machining Services: CNC-finished sealing faces and brazing-compatible joints.
Engineering Consultation: Design and material support for refrigerant compatibility and durability.
