The tube is produced to strict internal cleanliness requirements, with residual contamination controlled to ≤38 mg/m² (per EN 12735-1) or tighter. This is critical because contaminants inside the refrigerant circuit can damage compressors and expansion valves. Tubes are supplied with both ends capped and plugged to preserve cleanliness during shipping and storage . Available in plain (smooth) and inner-grooved configurations; inner-grooved tubes feature a spiral thread pattern on the inner surface that increases heat transfer area by 20–25% compared to smooth tubes of the same diameter, significantly improving evaporator and condenser efficiency .

Key Features:

• Excellent Brazing Performance: Phosphorus content (0.015–0.040%) improves molten filler flow and reduces joint porosity during brazing .

• Hydrogen Embrittlement Resistance: Low oxygen content prevents micro-cracking at grain boundaries during high-temperature brazing .

• High Internal Cleanliness: Capped ends and controlled residue levels prevent compressor contamination.

• Superior Formability: Soft annealed temper allows easy bending, flaring, and on-site installation without cracking .

• Enhanced Heat Transfer: Inner-grooved options increase surface area and turbulence for higher system efficiency .

Applications:

• HVAC/R Systems: Connecting tubes, refrigerant lines, and capillary tubes in air conditioners, refrigerators, and heat pumps.

• Heat Exchangers: Evaporator and condenser coils (inner-grooved tubes preferred).

• Refrigeration Equipment: Commercial refrigeration, cold storage, and compressor connection lines.

• Compressor & Valve Connections: High-reliability brazed joints in R410A, R32, and other high-pressure refrigerant systems.