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HVAC industry
Aluminum Foil for Heat Exchangers (Fin Stock)
Mainly used for fins in evaporators and condensers.
Surface treatments: plain foil, hydrophilic coated foil (blue/gold), hydrophobic coated foil (white/black), anti-mold/antibacterial coating, etc.
| Alloy Series | Typical Temper | Thickness Range (mm) | Characteristics and Applications |
| 1100 | O, H22, H24, H26 | 0.08–0.20 | Pure aluminum, excellent thermal conductivity, commonly used as base material for hydrophilic foil |
| 8011 | O, H22, H24, H26 | 0.08–0.20 | Slightly higher strength, most widely used base material for hydrophilic and hydrophobic coatings |
| 1030B | H22 | 0.10–0.15 | Frequently used in high-end Japanese systems |
| 3003 | H14, H24 | 0.08–0.12 | Better corrosion resistance, used in mid-to-high-end units |
| 4343+3xxx+4343 Clad Foil | H14 | 0.08–0.15 | Brazing clad foil, used in micro-channel and parallel-flow condensers |
Tubing (Heat Transfer Tubes and Connection Tubes)
Brazing Clad Aluminum Materials (Nocolok brazing, mainly for automotive heat exchangers and some residential parallel-flow condensers)
- Clad sheet: 4045/3003, 4343/3003/4343
- Clad strip: used for bending into headers
- Micro-channel tube + clad fin + clad header → fully brazed assembly
Type | Common Specifications | Alloy/Temper | Applications |
Smooth tubeoothSmooth tube | Φ5, Φ7, Φ7.94, Φ9.52 mm etc. | 1050, 1070, 1100, 3003 / O, H14 | Copper tube replacement, used for rifled tubes |
Internally rifled tube | Φ5 mm, Φ7 mm (50–70 teeth) | 3003, 3102 / H12 | Mainstream choice for residential AC evaporators and condensers |
Pancake coil | 3.0–25.4 mm | 1070 / O | Connection tubes, insulated lines |
Micro-channel parallel flow tube (MPE) | 16×1.8 mm, 20×2.0 mm, 25.4×2.4 mm etc. | 1100, 3003 / H112 | Automotive parallel-flow condensers, residential micro-channel heat exchangers |
- Pure aluminum pots
Very common in the past, now relatively rare. They offer the best heat conduction but low hardness, easy deformation, and the surface tends to blacken. - Hard-anodized aluminum (hard anodized)
The surface undergoes anodizing treatment to form a hard aluminum oxide layer, greatly increasing hardness, wear resistance, and corrosion resistance. Usually dark gray or champagne in color (e.g., Supor hard-anodized pots in China, Anolon and Circulon abroad). - Aluminum alloy + surface coating (mainstream non-stick pans) Aluminum alloy base with PTFE (Teflon) or ceramic coating sprayed on the surface—the most common form of non-stick pans today (e.g., Supor, Zwilling, GreenPan, T-fal, etc.).
- Composite-bottom / multi-layer clad aluminum pots
A layer of stainless steel or steel is clad to the bottom to make the pan compatible with induction hobs (e.g., steel-aluminum-steel three-layer composite bottom). - Die-cast aluminum pots
Formed by die-casting process, allowing wall thickness of 4–6 mm or more for better heat retention. Common in high-end non-stick lines (e.g., Chinese brands Chudakou, Eisin, ASD’s premium series).