Brazing aluminum foil is a composite functional material specially used in heat exchange systems such as heat exchangers, condensers, evaporators and battery cooling components. Its typical structure is a 3003 series alloy substrate with a low melting point brazing layer (such as 4343, 4045 or Zn modified alloy) on the surface, which realizes structural one-piece molding and firm connection after heating.
foil products in various structures and specifications. The basic base layer and brazing layer alloys are as follows:
| Brazing layer grade | Base grade | Temper | Coverage rate (%) | Thickness(mm) | Width(mm) | Plate length (mm) | Coil inner diameter (mm) | Coil outer diameter (mm) |
|
4A13 4A17 4A43 4A45 4045 4045 4047 4104 4343 |
3A11 3003 3003 6A02 6060 6082 6951 7A11 7072 |
O H12 H22 H14 H24 H24 H16 H26 |
3.0 ~ 25.0 | 0.050 ~ 6.000 | 7.0 ~ 1600.0 | ≤10, 000 |
75.0 150.0 200.0 250.0 300.0 400.0 500.0 505.0 |
2500.0 |
| The order of alloy structure is "brazing layer/substrate layer", such as 4343/3003 | ||||||||
| The 7072 grade is an anodic anti-corrosion layer, which is usually used as an outer layer in a three-layer or multi-layer structure. | ||||||||
Brazing aluminum foil is widely used in vacuum brazing, nocolok brazing and controlled atmosphere brazing (CAB) and other processes. Chalco brazing aluminum foil can be customized with coating ratio, alloy type, coil width and other parameters. The product has been widely used in automotive thermal management, HVAC systems, power electronic equipment and industrial heat exchange systems.
Chalco brazing aluminum foil product type recommendation
Chalco provides five categories of brazing aluminum foil products, ranging from conventional single/double-sided coating to multifunctional composite structures with anti-corrosion, thermal conductivity and ultra-thin performance. It also supports the independent supply of core aluminum foil, which can meet the use needs of multiple industries such as heat exchangers, heat dissipation modules, and liquid cooling systems.
Chalco single-side clad foil
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Our single-sided composite brazing aluminum foil has good weldability and cost-effectiveness, and is suitable for heat exchange systems with low structural strength requirements and welding concentrated on one side.
The cooperation areas are extensive: condenser fins, headers, heat pipe brackets, and automotive water cooling structures.
Hot selling alloy combination includes:
- 4343/3003
- 4343/3102
- 4045/3003
- 4345/3003
- 4343/6951
Chalco double-side clad foil
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The double-sided cladding structure is suitable for components that are welded on both sides at the same time, which improves the overall structural connection strength and is a common form of automotive heat exchanger structure.
Typical application areas: evaporator, multi-channel cooling structure, fuel cell cold plate, etc.
Hot selling alloy combination includes:
- 4343/3003/4343
- 4343/3102/4343
- 4345/3003/4345
- 4045/3003/4045
- 4343/3003/4045
- 4104/3003/4104
- 4045/3102/4045
Chalco corrosion-resistant & high-performance brazing foil
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To meet the requirements of use in highly corrosive, high-strength, thermally conductive and customized structural environments, Chalco provides a variety of three-layer/ multi-layer composite brazing aluminum foil products. The composite structure can be combined with an anodic anti-corrosion layer (such as 7072), a high-strength core material (such as 6061, 6951) and a customized Zn content design to improve the reliability and life of the product under harsh service conditions.
Typical application areas: automotive condensers and evaporators, ship refrigeration systems, new energy battery cooling modules, precision liquid cooling structural parts, industrial heat exchangers (high salt spray environment).
Hot selling alloy combination includes:
- 4343/3003/7072
- 4045/3003/7072
- 4343/3003+Zn/7072
- 4343/6061/7072
- 4343/6951/7072
- 4045/3102/7072
Fin stock brazing foil
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Fin Stock Brazing Foil is a specialized aluminum foil designed for efficient heat transfer and strong bonding in heat exchanger manufacturing. It offers excellent brazing performance, high thermal conductivity, and superior corrosion resistance, making it ideal for applications such as automotive radiators, air conditioners, and industrial heat exchangers. Its precise thickness and consistent quality ensure reliable, uniform joints and enhanced durability of the final products.
- Suitable for corrugated/fish scale/serrated embossing process
- Support multi-layer composite design (double package/triple layer)
- High brazing compatibility, good fin integrity after welding
- With Zn corrosion protection or battery thermal management optimization structure
Recommended thickness range: 0.05–0.15 mm
Examples of typical alloy structures:
- 4343/3003
- 4343/3003/7072
- 4045/3102/7072
It can provide subsequent services such as coil cutting, cut-to-length cutting, surface treatment, oxidation cleaning, etc. to meet the requirements of batch automated fin stamping lines for material consistency and processability.
Chalco brazing foil core material
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Chalco can also supply high-strength core aluminum foil for customers' secondary coating, deep processing or high-strength structural parts production to meet internal composite, molding or intermediate layer manufacturing needs.
Typical application areas: brazing aluminum strip production, heat sink fins, guide vanes, cold plate support layers, etc.
Available alloys and structures:
- 3003 general brazing core
- 3003+Zn modified al core
- 3102 thermal core
- 6061 high strength core
- 6951 heat-resistant core
Customizable thickness of 0.07–0.25mm, O/H14/H24/H18 state; delivered in coils, supports pre-treatment such as degreasing, cleaning, and anode.
In addition to high-quality brazing foil, we also offer a variety of brazing materials, including brazing aluminum strip, filler rods, and welding wires, fully meeting your diverse needs across different brazing processes. Explore our brazing materials range and let us help enhance your production efficiency and welding quality.Quick Quote
Chalco brazing composite aluminum foil product technical parameters and performance indicators
To ensure the long-term stability of brazing aluminum foil in complex heat exchange structures and precision welding processes, Chalco strictly controls key properties such as thickness, tolerance, tensile strength, ductility and corrosion resistance. The following are the core technical parameters of representative brazing foil products, covering typical values of different cladding structures and core alloys, to support customers in efficient comparison in material selection and structural design.
The data in the table are based on YS/T 446 and GB/T standards, and combined with Chalco's independent test results, which are suitable for typical specifications of mass-produced products. We can provide higher-level performance customization solutions and third-party test reports according to customer requirements.
Chalco brazing aluminum foil coverage deviation
| Coverage rate (%) | Coverage rate tolerance (%) |
| 3.0～6.0 | ±1.2 |
| >6.0～8.0 | ±1.5 |
| >8.0～13.0 | ±2.0 |
| >13.0～25.0 | ±3.0 |
Chalco brazing aluminum foil thickness deviation
| Thickness(mm) | ≤1000 mm width deviation | >1000～1320 mm width deviation | >1320～1600 mm width deviation |
| 0.050～0.100 | ±0.006 | ±0.006 | ±0.006 |
| >0.100～0.200 | ±0.015 | ±0.015 | ±0.015 |
| >0.200～0.400 | ±0.020 | ±0.030 | ±0.040 |
| >0.400～0.700 | ±0.030 | ±0.040 | ±0.050 |
| >0.700～1.000 | ±0.040 | ±0.050 | ±0.060 |
Chalco composite aluminum foil width deviation
| Width range(mm) | Width tolerance (mm) |
| 7.0～100.0 | ±0.1 |
| >100.0～300.0 | ±0.3 |
| >300.0～1320.0 | ±1.0 |
Room temperature tensile mechanical properties of Chalco composites
| Temper | Thickness(mm) | Tensile strength Rm (N/mm²) | Specified non-proportional elongation strength Rp0.2 (N/mm²) | Elongation after fracture A50mm (%) |
| O | 0.050～0.100 | 95～160 | 35 | ≥6.0 |
| >0.100～0.200 | 35 | ≥10.0 | ||
| >0.200～1.300 | 35 | ≥18.0 | ||
| H12 | 0.050～0.100 | 120～170 | 90 | ≥1.0 |
| >0.100～0.200 | 90 | ≥3.0 | ||
| >0.200～1.300 | 90 | ≥4.0 | ||
| H22 | 0.050～0.100 | 120～170 | 80 | ≥2.0 |
| >0.100～0.200 | 80 | ≥6.0 | ||
| >0.200～1.300 | 80 | ≥6.0 | ||
| H14 | 0.050～0.100 | 150～200 | 125 | ≥0.5 |
| >0.100～0.200 | 125 | ≥1.0 | ||
| >0.200～1.300 | 125 | ≥2.0 | ||
| H24 | 0.050～0.100 | 150～200 | 115 | ≥1.0 |
| >0.100～0.200 | 115 | ≥3.0 | ||
| >0.200～1.300 | 115 | ≥3.0 | ||
| H16 | 0.050～0.100 | 170～230 | 150 | ≥0.5 |
| >0.100～0.200 | 150 | ≥1.0 | ||
| >0.200～1.300 | 150 | ≥2.0 | ||
| H26 | 0.050～0.100 | 170～230 | 140 | ≥1.0 |
| >0.100～0.200 | 140 | ≥2.0 | ||
| >0.200～1.300 | 140 | ≥3.0 | ||
| H18 | >0.100～0.200 | ≥200 | 170 | ≥0.5 |
| >0.200～6.000 | 170 | ≥1.0 |
Room temperature tensile mechanical properties of composite materials
| Temper | Thickness(mm) | Tensile strength Rm (N/mm²) | Specified non-proportional elongation strength Rp0.2 (N/mm²) | Elongation after fracture A50mm (%) |
| O | 0.050～0.100 | 95～165 | 35 | ≥6.0 |
| >0.100～0.200 | 35 | ≥10.0 | ||
| >0.200～1.300 | 35 | ≥18.0 | ||
| H12 | 0.050～0.100 | 125～205 | 90 | ≥1.0 |
| >0.100～0.200 | 90 | ≥2.0 | ||
| >0.200～1.300 | 90 | ≥3.0 | ||
| H22 | 0.050～0.100 | 125～205 | 80 | ≥2.0 |
| >0.100～0.200 | 80 | ≥3.0 | ||
| >0.200～1.300 | 80 | ≥7.0 | ||
| H14 | 0.050～0.100 | 145～225 | 125 | ≥1.0 |
| >0.100～0.200 | 125 | ≥2.0 | ||
| >0.200～1.300 | 125 | ≥4.0 | ||
| H24 | 0.050～0.100 | 145～225 | 115 | ≥2.0 |
| >0.100～0.200 | 115 | ≥3.0 | ||
| >0.200～1.300 | 115 | ≥5.0 |
Room temperature tensile mechanical properties of composite materials
Brazing layer: 4004, 4045, 4104, 4343
Matrix: 6A02, 6060, 6063, 6951
| Temper | Thickness(mm) | Tensile strength Rm (N/mm²) | Specified non-proportional elongation strength Rp0.2 (N/mm²) | Elongation after fracture A50mm (%) |
| O | 0.200~6.000 | ≤160 | 85 | 16.0 |
Room temperature tensile mechanical properties of composite materials for fins
Brand: 4A13, 4A17, 4A43, 4A45, 4004, 4045, 4104, 4343
Base: 3A11, 3003, 7A11
| Temper | Thickness(mm) | Tensile strength Rm (N/mm²) | Specified non-proportional elongation strength Rp0.2 (N/mm²) | Elongation after fracture A50mm (%) |
| H14 | 0.050–0.100 | 150–210 | 135 | ≥0.5 |
| >0.100–0.200 | ≥1.0 | |||
| H16 | 0.050–0.100 | 170–230 | 160 | ≥0.5 |
| >0.100–0.200 | ≥1.0 |
Comprehensive brazing foil solutions for 6 major sectors by Chalco
As a key material in composite heat exchange structures, brazing aluminum foil is widely used in automotive thermal management, new energy battery cooling, rail transit HVAC, industrial refrigeration and air conditioning heat exchange, military and aviation thermal control systems, etc. According to different service environments and welding methods, customers have highly differentiated requirements for foil thickness, composite structure, solder alloy, anti-corrosion layer, thermal conductivity, etc.
Automotive heat exchangers
The automotive industry demands lighter, integrated, and reliable heat exchangers. Brazing aluminum foil serves as the main bonding and packaging material in evaporators, condensers, and intercoolers, enabling uniform welding of large heat exchange surfaces and enhanced durability with corrosion-resistant layers like 7072.
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Chalco's hot-selling brazing aluminum foil and composite structure product recommendations:
- 4343/3003/7072: Widely used in the main structure of automotive heat exchangers such as condensers and evaporators
- 4045/3102/7072: Suitable for air conditioning system evaporator and internal circulation condensing system
- 4343/6951/4343: Suitable for high-strength and high-pressure parts such as intercoolers
- 4343/6061/7072: High-strength composite structure, suitable for heavy-duty heat exchange in engine compartments
- 4343/3003+Zn/7072: Cooler applications with higher corrosion resistance requirements
Recommended brazing products for automotive heat exchange systems:
4343/3003-H14 Fin Stock Foil
Composite strip for brazing
4045/3003 coil + spray coating pretreatment
New energy batteries and thermal control systems (battery cooling systems)
Demand is rising for brazed aluminum in EV battery cold plates and thermal structures, with higher standards for conductivity, weldability, corrosion resistance, and thinness. Ultra-thin multilayer brazed aluminum foil is now key for integrated liquid and electric cooling, offering fast thermal response and reliable sealing for next-gen electric drive platforms.
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Chalco's hot-selling brazing aluminum foil and composite structure product recommendations:
- 4343/3003+Zn/7072: Suitable for high-power cold plates, with excellent anti-corrosion performance
- 4045/3102/7072: Suitable for lightweight module radiators, with both weldability and stability
- 4343/6951/7072: Suitable for power battery modules with high structural requirements, taking into account both strength and processability
- 4343/6061/7072: High thermal conductivity + high strength composite structure, suitable for new energy high heat flux density working conditions
- 4004/3003/7072: Suitable for multi-channel structure applications of large-size custom cold plates
Recommended brazing products commonly used for new energy thermal control structures:
3003-H16/6951 Fin Stock Foil
4045/3003/7072 Brazing Coil
4343/3102/4343 Brazing Strip
HVAC & commercial cooling
In HVAC equipment such as air conditioners, chillers, ventilation modules, etc., the brazed aluminum foil structure has excellent thermal conductivity, processability and consistency, and is suitable for high-efficiency connection of batch fin structures, especially for fin-tube evaporators, condensers, headers and distribution pipes.
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Chalco's hot-selling brazing aluminum foil and composite structure product recommendations:
- 4045/3003/7072: Main material for air conditioning condensers, with good weldability and corrosion resistance
- 4343/3102/7072: Special for chiller fins and condensing structures
- 4343/3003/4343: Dedicated to large-size evaporator main structure, suitable for commercial HVAC systems
- 4004/3003/7072: Customized construction for heat pump type HVAC modules
- 4343/6951 7072: For large multi-channel current collecting structures
Recommended brazing products for commercial refrigeration equipment:
3003-H16 Fin Foil
4343/3003/7072 Coil
4343/3003/7072 Coil
Heavy machinery & rail systems
Engineering equipment and rail trains have higher standards for cooler reliability and structural strength. Brazed aluminum foil is suitable for large- sized plate-fin structures under medium and high-pressure conditions, especially in complex environments such as engine oil cooling systems and train air-conditioning heat exchange structures.
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Chalco's hot-selling brazing aluminum foil and composite structure product recommendations:
- 4343/6061/7072: High strength + excellent welding performance, suitable for heat exchange structures of heavy-duty vehicles
- 4343/3003/7072: Composite foil for rail vehicle roof air conditioning condensation system
- 4045/3102/7072: High-throughput thermal module universal type
- 4343/6951/7072: Suitable for cooling components of equipment with frequent vibrations
- 4343/3102/4343: High weld strength, suitable for long-distance vehicle cooling units
Recommended brazing products for engineering and rail transit thermal control:
Large fin aluminum foil material
Multilayer plate-fin structure brazing coil
Structural plate + tube shell brazing plate combination
Marine cooling & anti-corrosion systems
Marine cooling and oil & gas heat exchangers require high salt spray corrosion resistance. Composite brazing aluminum foil with anode alloys (e.g., 7072) provides active protection, ideal for ship HVAC, engine cooling, and offshore thermal control.
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Chalco's hot-selling brazing aluminum foil and composite structure product recommendations:
- 4343/3003/7072: Special for brazing structure of marine air conditioning condenser
- 4343/3102/7072: Suitable for platform anti-corrosion heat exchange unit
- 4343/6951/7072: High-strength and corrosion-resistant structure, suitable for modular cooling equipment of ships
- 4045/3003/7072: Core materials for lightweight modular brazing systems
- 4343/6061/7072: Suitable for use in offshore equipment with strict anti-corrosion requirements
Recommended brazing products commonly used in marine systems:
High corrosion resistant brazing coil (double-sided 7072)
Anti-corrosion fin aluminum foil (3003+Zn)
Brazing structural plates (composite cladding)
Three aspects to confidently choose Chalco brazing aluminum foil
As a source manufacturer of aluminum alloy composite materials, Chalco offers a fully integrated production chain for brazing aluminum foil, from casting, rolling, composite bonding, to heat treatment, cutting, testing, and packaging. All key processes are independently controlled, ensuring stable quality, fast delivery, and full traceability. We provide customized solutions to meet the strict requirements of global heat exchanger, power battery, and electronic thermal management industries.Quick Quote
1. Advanced composite rolling capability
Chalco supports single-side, double-side, and multi-layer structures, with widths from 7 mm to 1320 mm and thickness down to 0.0045 mm. Our high-precision control ensures thickness tolerance up to ±0.006 mm, suitable for cold plates, battery modules, and other demanding applications.
2. Clean & Precise production environment
Production is conducted in high-cleanliness environments, meeting standards for aerospace and electronic materials. This ensures excellent surface cleanliness, batch consistency, and product reliability.
3. Flexible customization & packaging
Chalco offers custom alloy design (e.g., Zn-modified, anti-corrosion, high thermal conductivity layers), cut-to-length or die-cut processing, and support for various tempers (O, H12, H14, etc.). Packaging is export-ready, with options for vacuum sealing, anti-static, moisture-proof, and wooden crate shipping for sea, air, or rail transport.
FAQ for purchasing Chalco Brazing Aluminum Foil
Does Chalco support customized service for brazing aluminum foil?
Yes, Chalco provides customized brazing aluminum foils in single-sided, double-sided, triple-layer and multi-functional composite structures. The alloy combination, coverage, thickness, width, roll diameter and surface pretreatment can be customized according to customer requirements to meet the process requirements of different application scenarios .
What is the typical thickness and width range for brazing foil?
The conventional thickness range is 0.05mm-0.30mm, and the width range is 10mm-1320mm. The ultra-thin structure can be as thin as 0.03mm, and it also supports precision slitting and fixed roll diameter delivery.
What typical brazing structures are suitable for automotive heat exchange systems?
The recommended structure is:
- 4343/3003/4343 (double cladding)
- 4343/3003/7072 (three-layer anti-corrosion structure)
- 4045/3102/7072 (high corrosion resistant composite)
- 4343/6951/7072 (high-strength core material structure)
These structures are widely used in condensers, evaporators, battery cold plates and other fields.
Does Chalco provide post-processing of brazing foils such as fin stamping?
We can provide supporting materials for fin processing. Some cooperation projects support primary processing services such as punching, forming, and punching. We can also provide recommendations and parameter support for composite brazing foils for fin stamping.
What are the main states of brazing aluminum foil? Can it be heat treated?
Common states of brazing aluminum foil include O, H12, H14, H16, H18, H22, H24, H26, etc. Most products are non-heat-treated strengthened alloys (such as 3003, 6951, etc.), and some core materials (such as 6061) can be heat-treated to improve strength.
Is brazing foil suitable for vacuum brazing, hydrogen brazing or salt bath brazing?
Chalco products are widely used in vacuum brazing and hydrogen shielded brazing. If there is a special atmosphere or heat source requirement (such as salt bath, induction brazing), it is recommended to specify the process environment in advance so that we can optimize the coverage, alloy layer thickness and diffusion control.
How to choose the alloy structure of brazing aluminum foil?
- Is an anti-corrosion layer required (such as 7072)?
- Soldering temperature and fluidity (such as 4343 vs 4045)
- Are there any core material strength requirements (such as 6951, 6061)
- Whether deep drawing, molding, bending and other processing requirements are required in the future
If you have more technical selection or project customization requirements, please click "Get a quote" at the bottom of the page to get one-on-one support and sample recommendations from engineers!
Chalco can provide you the most comprehensive inventory of aluminum products and can also supply you customized products. Precise quotation will be provided within 24 hours.
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