Aluminum Fin Stock Material
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Aluminum Fin Stock Material

Aluminum foil is widely used in the production of fins for automotive and air conditioning heat exchangers because of its good thermal conductivity, low density, light weight, easy processing, odorless, environmental protection and low price.

The classification of aluminum fin stock material

Aluminum fin stock is divided into Cladding aluminum fin stock and Non-Cladding aluminum fin stock.

Cladding aluminum fin stock

The Cladding aluminum fin stock developed by our company has excellent brazing ability, can resist core layer dissolution and high temperature collapse, and can make the heat exchanger lighter.

Non-Cladding aluminum fin stock

Non-Cladding aluminum fin stock is the most basic heat exchanger material. It only consists of a core layer and does not contain a cladding layer. It can be used in automotive radiators, intercoolers, oil coolers, evaporators, water tanks, heaters, and various air conditioner radiators, etc.

Aluminum Fin Stock

The specifications of Chalco Aluminium fin stock

The specifications of cladding aluminum fin stock

The brazing alloy 4343 can be replaced by 4045, 4047 according to customer requirements, and the core layer can be selected to use 3003MOD or 3005MOD according to customer needs.

Typical alloy material 4343/3003MOD; 4343/3003MOD/4343;
Temper H14, O, etc.
Thickness 0.06-0.08 mm
Width 8-1500 mm
Tube core inner diameter 152; 200; 250; 300; 400; 500 mm, etc.
Maximum outer diameter 1800MM
Number of composite layers single layer, double layer, multi-layer
Compounding rate 4% to 30%

Composite structure

The specifications of Non-Cladding aluminum fin stock

Alloy 1100/1200/1030B/1300/3003MOD/3005MOD/3102/8011/8006/8079/7072 etc.
Temper O, H111, H22, H24, H16, H26, H18, H19, etc.
Thickness 0.06-0.25mm
Width 8-1500 mm
Tube core inner diameter 152; 200; 250; 300; 400; 500mm, etc.
Maximum outer diameter 1800MM

The performance advantages of Chalco Aluminum fin stock

The performance advantages of cladding aluminum fin stock

  • Has good brazing performance, suitable for different brazing furnaces
  • Good consistency, suitable for all kinds of fin machines to roll fins at full speed
  • Good brazing resistance to collapse

The performance advantages of non-cladding aluminum fin stock

  • Has good thermal conductivity
  • Has good anti-corrosion properties
  • Easy to process
  • Odorless, environmentally friendly and inexpensive

The production technology and characteristics of Chalco Aluminum fin material

Cladding Aluminum Finstock

Production process: The cladding aluminum fin stock material is generally composed of a core material and a composite layer. After aluminum ingots - casting - soaking - compounding - hot rolling - cold rolling - slitting - It is produced by multiple processes such as packaging.

The Production Technology and Characteristics of Chalco Aluminum Fin Material

Features: complex process, high price, excellent brazing ability

Non-Cladding aluminum fin stock

The Non-Cladding aluminum fin stock includes plain aluminum foil and Pre-coated Aluminum Fin Stock

The Production technology and characteristics of Plain aluminum foil

Production process: aluminum foil with no surface treatment after rolling and annealing.

Features: simple process, low price

The Production technology and characteristics of Pre-coated Aluminum Fin Stock

Production process: coat both sides of plain foil with anti-corrosion coatings and hydrophilic coatings with various quality requirements.

Features: the heat exchange efficiency is increased by about 59%, thus playing the role of energy saving, material saving, reducing the volume of air conditioners and prolonging the service life.

Several classifications of non-cladding aluminum fin stock

Uncoated aluminum fin stock

Uncoated Aluminum fin stock is actually the silver light plate. It is an aluminum foil that has been rolled and annealed without any form of surface treatment. At present, there are very few uncoated aluminum foils used for air conditioners, accounting for less than 50%. While 15 years ago, uncoated aluminum foils were the mainstream.

Uncoated Aluminum Fin Stock

Pre-coated aluminum fin stock

Coated foil surfaces have been treated to provide more functionality than non-coated ones. Many countries began to use coated aluminum foil in the last 10-15 years. Many of the corrosion-resistant aluminum foils and hydrophilic aluminum foils mentioned in the following content can be classified as coated aluminum foils.

Corrosion resistant aluminum fin stock

As the name suggests, corrosion-resistant aluminum fin stock is coated with a corrosion-resistant protective layer. Corrosion-resistant aluminum foil can not only be used in harsh environments, improve the service life of air conditioners, but also help improve the ventilation quality of air conditioners. So, it is widely used.

Hydrophilic aluminum fin stock

The surface of hydrophilic aluminum Fin Stock foil has strong hydrophilicity and certain corrosion resistance. Its main function is hydrophobicity, which avoids the effect of water droplets "bridge" between the heat exchange fins and affects the ventilation effect of the heat exchanger. In this way, it can improve the heat exchange rate of the air conditioner and save electricity under the same cooling capacity. In the past, the general hydrophilic aluminum foil on the market not only has good hydrophilicity on the surface, but also has high corrosion resistance, so that the performance of the air conditioner is more optimized.Quick Quote

Hydrophilic Aluminum Fin Stock

Hydrophobic aluminum fin stock

Hydrophobic aluminum fin stock foil is also called hydrophobic aluminum foil. Its surface properties are the opposite of hydrophilic aluminum foil, but its ultimate goal is also to prevent condensed water from remaining between the heat exchange fins. The difference is that the hydrophobic aluminum foil achieves the purpose of removing the condensed water between the heat exchange fins by increasing the contact angle between the condensed water and the heat exchange fins, so that the condensed water forms droplets that are easy to slide off.

Self-lubricating aluminum fin stock foil

Self-lubricating aluminum fin stock foil does not need to add lubricating oil separately during its punching process, and the lubrication during punching is borne by the pre-treated film on the surface of the aluminum foil. Since there is no need to add lubricating oil, the subsequent cleaning and drying processes of trichloroethylene are also omitted.

Mildew-proof aluminum fin stock foil

Mildew-proof aluminum finstock foil is mainly used for the indoor unit part of the air wither. Its main function is to prevent the surface of the heat exchange fin from becoming moldy due to the use or placement for a long time, thereby improving the ventilation quality of the empty wither.

Mildew-proof Aluminum Fin Stock foil

The main experimental test of Chalco Aluminum fin stock

Alkali resistance test

Since the lubricating oil on the surface of the heat exchange fin after punching needs to be removed with an alkaline cleaning agent, it is required that the functional coating on the surface of the aluminum foil must have a certain alkali resistance. The experimental conditions are generally immersed in 20% NaOH solution for 3 minutes, and then take out the experimental aluminum foil to see if the aluminum foil foams.

Alkali Resistance Test

Humidity and heat resistance test

This experiment is to test the degree of corrosion after a long time at a certain temperature and a certain humidity, so as to judge its corrosion resistance. This performance is also an important indicator to measure the weatherability of the heat exchanger fins.

Humidity and heat resistance test

Salt spray test

The purpose of the experiment is to carry out the salt spray experiment of extreme test on the corrosion resistance of the fins with professional instruments to simulate the influence of the harsh environment on the fins in reality.

Salt Spray Test

Experimental conditions: The test aluminum foil was placed in a salt water spray environment of 35 °C and 3%.

Experimental basis: "GB/T10125-2012-Artificial Atmosphere Corrosion Test-Salt Spray Test". General outdoor environmental materials require resistance to neutral salt spray for 500h.

Experimental requirements: No corrosion spots are required for 500h, because the resistance to salt spray corrosion is directly related to the service life of the heat exchange fins.

The application of aluminum fin material

The aluminum fin material is punched and flanged by a punching machine to become a heat dissipation fin. A heat exchanger is formed after tube threaded, tube expanded, degreased, and assembled. Cladding aluminum fin stock is mainly used in automotive parallel flow condensers.

Non-composite aluminum fin materials are mainly used in automotive radiators, intercoolers, oil coolers, evaporators, water tanks, heaters, and various air conditioner radiators, etc.

Why choose Chalco Aluminum?

Our company has world-class hot rolling mills and cold rolling mills

CM mass flow control; tighter thickness tolerances.

Precision thin slitting, the latest imported cutter shaft.

Narrowest shear: 8mm, outer diameter: 1800mm

We have more than 30 years of experience in supplying clad and non-clad aluminum fin stock for heat exchangers, intercoolers, condensers and evaporators. Now we have become a world-renowned enterprise in the market of rolled aluminum for heat exchangers and other related fields.

We have passed the IATF16949 certification required by the automotive industry, the AS9100 certification required by the aviation industry, and the DNV BV LR ABS RINA CCS certification required by the shipbuilding industry.Quick Quote

The Chalco brand stands for quality, delivery and a strong reputation. With leading technology and globally competitive products, we can continue to develop together with our customers in the future.

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