Copper Capillary tubes Manufacturer, Supplier and Exporter

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Copper capillary tubes are slender, cylindrical pipes made of high-grade copper, primarily used for controlling the flow of refrigerants in refrigeration and air conditioning systems. Their function is critical in regulating pressure and ensuring efficient heat exchange within these systems.

Copper is chosen for capillary tubes due to its excellent thermal conductivity, corrosion resistance, malleability, and long-term durability. These properties ensure reliable performance even under high pressure and varying temperature conditions.

In refrigeration cycles, copper capillary tubes act as throttling devices. They reduce the pressure of the refrigerant as it flows from the condenser to the evaporator, allowing it to evaporate at a lower temperature and absorb heat effectively.

Capillary tubes are manufactured in various inner diameters, typically ranging from 0.3 mm to 2 mm, depending on system requirements. The length and diameter of the tube determine the flow rate and pressure drop, which must be precisely calculated for optimal performance.

Specification of Copper Capillary tubes

Parameter	Specification
Material	High-purity copper (99.9% Cu, as per ASTM B280)
Outer Diameter (OD)	1.5 mm to 4.76 mm
Inner Diameter (ID)	0.3 mm to 2.0 mm
Wall Thickness	0.2 mm to 0.9 mm
Length	1 meter to 6 meters (custom lengths available)
Tolerance	±0.02 mm (OD), ±0.01 mm (ID)
Surface Finish	Smooth, clean, oil-free
Hardness	Annealed (soft) or half-hard available
Maximum Working Pressure	Up to 800 psi (varies with size and system)
Temperature Range	-40°C to +150°C
Refrigerant Compatibility	R-22, R-134a, R-404A, R-600a, R-290, etc.
Standards Compliance	ASTM B280, EN 12735-1
Packaging	Coiled and sealed in moisture-proof packaging

These tubes are widely used in domestic refrigerators, freezers, air conditioners, water coolers, and small-scale cooling units. Their simplicity and reliability make them suitable for both household and commercial refrigeration systems.

Chemical Composition of Copper Capillary tubes

Element	C11000 (ETP Copper)	C12200 (DHP Copper)	Typical Function
Copper (Cu)	≥ 99.90%	≥ 99.90%	Base metal, excellent thermal conductivity
Phosphorus (P)	≤ 0.04%	0.015% – 0.040%	Deoxidizer (improves weldability in C12200)
Oxygen (O)	≤ 0.04%	< 0.02% (residual)	Lower oxygen improves corrosion resistance
Iron (Fe)	≤ 0.05%	≤ 0.05%	Trace impurity
Lead (Pb)	≤ 0.005%	≤ 0.005%	Should be minimal for cleanliness
Other Impurities	≤ 0.05% total	≤ 0.05% total	Includes Bi, Sb, As, etc.

With a proven track record as a Copper Capillary tubes exporter in over 30 countries, Sumer Metal Industries ensures global availability, third-party inspection support, and client-specific customization. Our wide export network combined with strict quality standards has made us a preferred choice for SS Grade3 tubing worldwide.

Specification of Copper Capillary tubes

Parameter	Specification
Material	High-purity copper (99.9% Cu, as per ASTM B280)
Outer Diameter (OD)	1.5 mm to 4.76 mm
Inner Diameter (ID)	0.3 mm to 2.0 mm
Wall Thickness	0.2 mm to 0.9 mm
Length	1 meter to 6 meters (custom lengths available)
Tolerance	±0.02 mm (OD), ±0.01 mm (ID)
Surface Finish	Smooth, clean, oil-free
Hardness	Annealed (soft) or half-hard available
Maximum Working Pressure	Up to 800 psi (varies with size and system)
Temperature Range	-40°C to +150°C
Refrigerant Compatibility	R-22, R-134a, R-404A, R-600a, R-290, etc.
Standards Compliance	ASTM B280, EN 12735-1
Packaging	Coiled and sealed in moisture-proof packaging

🏭 Industry & Application

✅ copper Capillary Tubes for Medical Industry
✅ copper Capillary Tubes for Chemical Processing
✅ copper Tubes for Instrumentation Lines
✅ Copper Capillary tubes for Gas & Liquid Flow
✅ copper Tubes for Heat Exchangers

❓ Frequently Asked Questions (FAQs)

Q1: What is a copper capillary tube?

A copper capillary tube is a small-diameter tube made of copper, used primarily in refrigeration and air conditioning systems to regulate the flow of refrigerant between the high-pressure and low-pressure sides of the system.

Q2:How does a capillary tube work in a refrigeration system?

It acts as a throttling device, reducing the pressure of the refrigerant as it moves from the condenser to the evaporator. This pressure drop allows the refrigerant to evaporate and absorb heat efficiently.

Q3:Why is copper used for capillary tubes?

Copper offers excellent thermal conductivity, corrosion resistance, ease of fabrication, and durability—making it ideal for critical HVAC and refrigeration applications.

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