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Bonded Fin Heat Sink

Bonded Fin Heatsink

Heatell is capable of providing your request. We hold an innovative production line imported from Taiwan. It can ensure a short and constant delivery time. Heatell is over 8 years in providing high-quality bonded fin heatsink worldwide.

Heatell bonded fin heatsink allows for higher fin aspect ratios and fin densities when compared to extrusion methodologies. Most clients prefer Heatell bonded fin heatsink to finalize their designs. Our bonded fin heatsink is obtainable for affordable price ranges.

Request Heatell now for an instant quote. We will serve what you deserve!

Your Premier Bonded Fin Heatsink Manufacturer and Supplier

Heatell manufacturing company is 100% capable of handling your orders. Heatell offers custom and standard bonded fin heatsink to complete your projects.  We have over 8 years of experience in the heatsink field.

Bonded Fin Heatsink

We are also an ISO 9001 certified company with qualified customer service staff and fully trained engineers. We can supply you with a bonded fin heatsink that matches entirely your projects.

Bonded Heatsink

Heatell is your go-to source bonded fin heatsink in China. We have all you need with respect to a high-quality bonded fin heatsink.

heat sink manufacturer

Aside from bonded fin heatsink. Heatell also offers heatsink manufacturing such as extruding, stamping, CNC machining, die casting cold forging, and many other technologies.

Contact us now! Let Heatell help your own business grow!

Bonded Fin Heat Sink

Item TypeBonded Fin Heat Sink
Technicalextrusion, skived fin, stamping, cold forging, bonded fin, die cast, liquid cold plates, folded fin
ApplicationInverter / Inverter / Power / IGBT / Rectifier / LED Lighting / Welding Machine / Communication Equipment / Electronics Industry /
Solid State Relay / Controller / Electromagnetic Heating
ShapesBased on your requirements.
Film Thickness
Anodized: Customized. Normal thickness: 8 um-25um.
Powder Coating: Customized. Normal thickness: 60-120 um.
ColorBased on your requirements.
FinishAnodizing, Mill finish, Electroplating, Polishing, Sand blasted, Powder coating, Silver plating, Brushed, Painted, PVDF etc.
Lengthcustomized length
Deep processCNC,drilling,milling,cutting,stamping,welding,bending,assembling,Custom Aluminum Fabrication
Packagingstandard export packaging or as discussed
Service1. Free sample, Free design;
2. OEM/ODM available;
3. Custom-made request;
4. New design solution suggestion
Delivery time15-20 days after sample confirmed & down payment, or negotiated
PortShanghai Port
Our Advantagesuperior quality with competitive price, Certified enterprises in China

heat sink effect

-Standard Packing Option-

* Express Delivery*
* Ocean Delivery*

-Loading & Shipment-

Heatell: The Leading Bonded Fin Heatsink Provider and Manufacturer with Best Price

Are you looking for a medium to high-density fin structure for your applications? The short in height Heatell bonded fin heatsink is an excellent solution.

bonded fin heat sink advantage

Heatell, a professional manufacturer and supplier in China, offers different bonded fin heatsink assemblies. You can choose from either forced or natural convection. Without increasing volume, Heatell bonded fin heatsink increases the surface area of heatsink.

No doubt, Heatell bonded fin heat sink reduces thermal resistance. Whether you manage heat dissipation for densely packaged and high-power applications, Heatell bonded fin heat sink is a cost-effective way.

heat sink profile testing

Heatell bonded fin heatsinks usually come from high-quality aluminum, copper, stainless steel, and Inconel materials. They are typically ranging from .010” to .080” thicknesses. However, if you require a specific thickness, we can custom bonded fin heat sink upon request.

Heatell bonded fin heatsink solutions:

  • Improved thermal resistance
  • Reduce tooling costs
  • Unlimited airflow length
  • Fabrication and material options are available

Heatell is a company specializing in the development, design, manufacturing, and sale of the bonded fin heat sink, which is great for different applications. They are suitable for variable speed motor controls, welding units, laser power supplies, traction drives, power rectification equipment, and uninterruptible power supplies (UPS).

At Heatell, if you rush it, we can fabricate it. Heatell will be your reliable and full-service partner from design to the shipping process. We have a total asset team in customer service, offering fabrication services to make your design a fulfillment.

Our team is hardworking to grow up quality relationships with our clients by committing to you. We will do our very best to assure that you have made the right choice.

Bonded Fin Heat Sink: The Ultimate Guide

I know choosing highly efficient heat sink can be an overwhelming task – a reason this guide will make everything simple for you.

It explores everything you need to know about bonded fin heat sink – from material type, design, features, manufacturing process to surface finish options, amongst others.

So, keep reading to learn more.

1. What Is Bonded Fin Heat Sink?

It is a mechanical component attached to an electrical device to facilitate heat transfer from the device to the surrounding environment.

Mostly, the surrounding is air, but in some applications, it could be fluids like coolant and water among others.

bonded heat fin sink

bonded fin heat sink

This type of heat sink has fins, which increase surface area of the device hence efficient heat transfer to the surrounding.

2. Parts Of Bonded Fin Heat Sink

Ideally, this type of heat sink contains three main parts, which include the following;

Base With Grooves

You can find the base in different designs, but extruded bases are preferred.

Most materials used for making the base for these heat sinks exhibit significant thermal conductivity.

Therefore, extrusion makes it easy to manage, especially in production and labor.

Alternatively, you can go for bases made out of large slabs of o-metal and machined out of a groove to create fins.

Lastly, you may consider casted bases even though this technique is quite expensive and requires a large upfront investment.


Most fins for this type of heat sink are cut from coil stock.

Adhesive For Bonding Fins To The Base

Often made of epoxy to ensure it puts all the fins together into the groove base and provides an efficient heat sink assembly.

3. How To Manufacture Bonded Fin Heat Sink

Technically, the manufacturing process of this component involves machining or extruding base of a specific metal material.

The fins are then stamped out of roll stock and attached to the base using thermal epoxy, soldering or brazing.

You can manufacture this heat sink using different techniques based on material and preferred shape.

However, the common methods you can use include the following;


Notable bonded fin heat sinks are derived from extrusion process.

It entails extruding aluminum metal to create cylindrical or sheet fins.


This bonded heat sink manufacturing method is common in production of heat sinks with heat pipes in the fins.

You can press the required form out of copper or aluminum.

Bonded heat sink made from this process is ideal for large-scale production.

CNC Machining

It is primarily suitable for manufacturing bonded fin heat sinks with complex geometry.

This process is effective, fast and accurate but usually costly.


This heat sink manufacturing process involves slicing the metal material based on the required heat sink profile.

Mostly, thin slices are sliced and bent upward to produce heat dissipation fins.

4. Applications Of Bonded Fin Heat Sink

You can use bonded fin heat sinks in a wide range of applications, such as the following;

  • Compressors
  • Automobile radiators
  • Refrigerator condensers
  • Electric motor
  • Electric transformers
  • IC cooling
  • AC/DC converter
  • Amplifiers
  • Power transistor
  • Relays

5. How Bonded Fin Heat Sink Work

Generally, the working principle of this type of heat sink revolves around eliminating heat away from the primary parts of the component or device.

Here are the aspects surrounding how this heat sink works;

  • Heat generation from the source

In this sense, source refers to any system capable of generating heat you require to eliminate for optimum operation.

  • Transfer of heat from source

Here, heat moves to the bonded fin heat sink from the source through natural convection method.

Ideally, thermal conductivity of this particular heat sink influences the entire process.

As such, materials like copper and aluminum come in handy when making bonded fin heat sink.

  • Distribution of heat on heat sink

Heat then moves to the bonded fin heat sink through natural convection from high to low-temperature sections.

  • Dissipation of heat from heat sink

At this point, heat moves from bonded fin heat sink to the surrounding as a result of temperature gradient.

6. Skived Heat Sink Vs Bonded Fin Heat Sink

Skived heat sink, in some instances, is known as a zipper fin heat sink.

This type of heat sink is constructed using a dedicated machine by cutting the fins and pushing them up into the right position.

skived heat sink

skived heat sink

The position is determined by a slight curve at fin base.

Bonded fin heat, on the other hand, is constructed by assembling individual fins by attaching them to the base in a dense array.

bonded fin heat sink

bonded fin heat sink

Ordinarily, bonded fin heat sink is suitable for space-limited or bespoke applications.

7. Best Material For Bonded Fin Heat Sink

It is manufactured from three main materials, which include the following;

  • Aluminum – It is a relatively lightweight, non-corrosive metal ideal for making bonded fin heat sinks used in non-ferrous applications.
  • Copper – This material is soft, ductile, and malleable metal exhibiting high thermal conductivity.
  • Iron – It is also ductile, reasonably soft, exhibiting moderate heat conductivity. Iron is malleable, lustrous, chemically reactive thus can rust in damp air but not in dry air.

8. Features Of Bonded Fin Heat Sink

The notable features of a typical bonded fin heat sink include the following;

  1. Reduced thermal resistance for high power component heat dissipation.
  2. Fabricated fins from different metals or extrusion methods are easy to cut to size to fit specific use.
  3. Easy-to-customize wings based on your thermal performance demands and packaging right height.
  4. Efficient for high power forced convection cooling applications.
  5. High heat dissipation capacity than conventional heat sinks with similar footprints
  6. 2-3 times increased cooling surface area than traditional heat sinks.
  7. Comes with a bonding resin with higher thermal conductive capacity for reduced thermal loss.
  8. Higher aspect ratio and high fin density increase cooling surface area for enhanced performance.
  9. Exceptionally durable hence increased service lifespan.

9. Surface Finishing For Bonded Fin Heat Sink

Different manufacturers apply a wide range of surface finishing treatments on bonded fin heat sinks.

However, the most common ones include the following;

  • Anodized surface treatment – This surface finish option entails using an electrochemical process to convert metal surfaces into a decorative, resilient and corrosion-resistant anodic oxide finish.
  • Nickel plating finish – It is an excellent wear-resistant yellowish-white hard-reflective finish exhibiting excellent dimensional repeatability and solderability.
  • Powder coat finish – This is a surface coating treatment formed by an electric charge, which triggers dry powder to fuse to the material surface.
  • Clear chromate finish – It is a type of conversion coating for passivating metals to provide corrosion resistance on the non-ferrous surface.

10. Types Of Bonded Fin Heat Sinks

They are available in different types based on the specific fin design.

Some common ones in the market include the following;

  • Annular bonded fin heat sink – The fins herein are annular-shaped and fixed on the margin of a cylindrical body.

Annular bonded fin heat sink

Annular bonded fin heat sink

  • Straight bonded fin heat sink – It consists of straight fins generally assembled to body surface in parallel directions.
  • Pin bonded fin heat sink – This design has a lower cross-section area with a more exposed surface area to the convection.
  • Radial fin – It is fixed on a cylindrical surface.

11. Factors Influencing Thermal Conduction And Convection Of Bonded Fin Heat Sink

They are quite a number, but the notable ones are as follows;

  • Specific type of material used for making the bonded fin heat sink
  • Actual thermal resistance of bonded fin heat sink
  • Type of fan used in the heat sink, whether blower, AC, DC or EC fan. Consider the mechanical design, air conduction and air convection of the type of fan you choose.
  • Manufacturing method of a bonded heat sink

12. Is It Possible To Black Anodize Bonded Fin Heat Sink?


However, the black hue finish would not necessarily be essential to reducing heat in forced convection.

Hence, this will, in the long run, increase costs significantly.

It is thus ideal to consider economical gold chromate as the perfect finish to protect the bonded fin heat sink against corrosion.

Black Anodized bonded fin heat sink

black anodized bonded fin heat sink

13. Do Bonded Fins In Heat Sink Fall Out?

The ideal way of ensuring bonded fins in heat sinks never exhibit any error is by ensuring you use proper materials.

Additionally, surface preparation of the bonded fins would also be helpful in preventing these components from falling out.

Besides, strict process control and going for high-quality standards when manufacturing bonded fins for heat sinks prevent them from falling out.

14. Ideal Spacing For Bonded Fins In Heat Sinks

Ordinarily, it depends on actual base breadth or foundation.

For instance, when the width of the base is up to 8.0 inches, it is advisable to space the fins at an average of 0.125 inches.

However, if you are working with a base of between 8.0 and 16 inches, the spacing could be about 0.2 inches from center to center for 0.05 inch thick fins.

But if the base has a width of over 16 inches, it would be ideal to evaluate the spacing on a case-by-case basis.

Simply put, there is no definite spacing for bonded fins in heat sinks.

15. Factors Determining Efficiency Of Bonded Fin Heat Sink

The main elements influencing overall performance of this type of heat sink include the following;

  • Dimensions – The length and width of the bonded fin are integral in determining the actual performance of the component.
  • Thermal resistance – It refers to heat property and measure of temperature difference based on how the material resists heat flow.
  • Fin spacing – Ideally, well-spaced fins in the heat sink enhance the overall performance of the component in the respective applications.
  • Fin density – The thickness of the specific fins assembled to make the heat sink is also a fundamental consideration of its general performance.
  • Volumetric resistance – It merely refers to electrical resistance of a body to current that passes through its bodily substance regardless of any surface leakage.
  • Airflow – The level and design of airflow inside the heat sink also determine its efficiency.

16. Ways Of Attaching Bonded Fin Heat Sink For Optimal Heat Transfer

You can use several methods, but the main techniques include the following;

Using Thermal Tape

It involves using pressure-sensitive adhesive tape, which in many instances is made of acrylic material.

Using this technique in bonding fin to heat sink is easy and generally economical.

However, it is not necessarily suitable for attaching heavier heat sinks since it doesn’t secure them firmly.

Moreover, you must ensure the heat sink surface and chip are clean to enable the tape to bond appropriately and fulfil its dual role.

Thermal Epoxy

It is a material that comes in either single or dual part mixed adhesive with thermally conductive fillers.

Using this material guarantees exceptional mechanical adhesion and affordability.

But its major shortcoming is that you have to refrigerate it before applying it.


This is an economical mechanical technique for attaching bonded fins in heat sinks.

Ideally, it entails using a stainless steel wire to create a clip for compressing the heat sink onto the chip and holding it down.

A Z-clip is essential since it offers a sturdy and secure mechanical bond.

Hence, it is most suitable in applications where shock and vibrations are a concern.

Secondly, it is easy to apply and remove since it is non-destructive to semi-conductors.

Bit its main downside is that it needs engineering to create and use, thus likely to take a few steps when assembling hence time-consuming.

17. Does Epoxy Limit Heat Flow In Bonded Fin Heat Sink?

Not necessarily.

What happens is that the conductivity of epoxy substance integrated into the bonded heat sink guarantees high performance even at extreme temperatures.

Therefore, epoxy hardly restricts heat flow inside the bonded finds heat sink.

18. Elements Determining Cooling Capacity Of Bonded Fin Heat Sink

The primary factors that influence cooling capacity of this type of heat sink include the following;

  • Attachment – This mainly refers to the type of bonding used to attach the fins in the heat sink.
  • Thermal resistance – It is heat property and measure of temperature difference based on how the material resists heat flow.
  • Surface treatment – The type of surface coating material and process used plays a fundamental role in ascertaining cooling capacity of this heat sink.
  • Fin design – This merely refers to the length, width and thickness of the specific fins assembled in the heat sink.
  • Cooling material – Ordinarily, cooling materials come in a wide variety, thus making it an ideal bonded fin heat sink cooling capacity.

Related Resources:

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