An introduction to The Use of Electronic Assembly Adhesive

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An introduction to The Use of Electronic Assembly Adhesive

Various types of adhesives are employed in the electronic industry. The performance of an electronic component can be determined by the reliability of the electronic adhesive used. That is why you must use the right adhesive for an electronic application.

So, do you have any idea of electronic assembly adhesive? This post will explain what you need to know about electronic adhesives. Every relevant information worth knowing about them will be revealed in this post. For instance, it will discuss how such adhesives differ from other multi-purpose adhesives.

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Printed Circuit Board

Electronic components are always mounted on a printed circuit board (PCB), making it the most significant item in the industry. The PCB normally comprises components that are connected in series and parallel. Simply put, it is a combination of various connections.

Those components you see on the surface of a printed circuit board are bonded with adhesives. Electronic assembly adhesive can be used for conformal coatings, wire tackling, and encapsulation of components.

Having said that, there are different types of electronic assembly adhesives that are used on different PCB components. In the next section, we will talk more about those adhesives.

Different Types of Electronic Assembly Adhesives

There are various phases that one should take into consideration when choosing the right electronic assembly adhesive for any particular application.

The way the adhesive is applied is equally of huge importance. That is because the right amount of adhesive must be applied at the precise location.

Of course, the different methods of applying electronic assembly adhesives include Pin Transfer, Syringe Application, and Screen Printing. Of all the methods, the most popular is syringe application. It is used during the manufacture of most PCBs.

We will take a look at the various electronic assembly adhesives the next section.

Electrically Conductive Adhesives

Most organic and inorganic adhesives are not meant to be conductive. The bulk of adhesives used on PCBs are originally non-conductive. Acrylics, epoxies, silicones, cyanoacrylates, and urethane acrylates are some of the adhesive with non-conductive properties.

Notwithstanding, conductive adhesives are required in many PCBs, including ICs. They are also needed for surface-mounted devices.

Thankfully, non-conductive adhesives can be changed to electrically conductive adhesives by adding a compatible filler to the base material. The latter is usually an epoxy-based resin. Fillers that can be used to make an adhesive conductive include carbon, nickel, and silver.

Electrically conductive adhesives exist in 2 forms: anisotropic and isotropic forms. Anisotropic adhesives have the unique property of being able to conduct electricity in every direction. However, isotropic adhesives do conduct theirs in one direction, the z-axis to be precise.

NB: Even though conductive adhesives can allow flow of electrons; they cannot replace solders in the electronic industry. That’s because they don’t combine well with tin or aluminum. They also don’t seem to perform well when exposed to humid conditions.

Thermally Conductive Adhesive

The reduction in the size of an electronic circuit normally comes with a price – heat generation. Such heat buildups can result in the failure of electronic components because their operating temp would have been exceeded.

In the electronic assembly adhesive industry, thermally conductive adhesives are used to create a pathway for heat flow to prevent any heat buildup inside the circuit. They can also be used to fasten diodes, transistors, as well as other power components.

Non-metallic and metallic powders are combined with the electronic assembly adhesive to make them more viscous. The resulting adhesives are high thermally conductive adhesives.

Most thermally conductive solutions are made from acrylics, silicone, and epoxies. With thermally conductive adhesives on a PCB, it can be used without the fear of heat generation.

UV Curing Adhesives

Adhesives that cure with light are being used more often in the electronics industry because they satisfy the material and processing requirements in the industry.

Adhesives that cure with light are user friendly. They can cure quickly without any need for high temperatures.

Such adhesives are formed around acrylic compounds and do contain light initiators in them. One of the shortcomings of such adhesives is that the ultraviolet light must penetrate the uncured resin. Light-curing adhesive solutions can hardly penetrate thick or dark-colored resins. That can influence the efficiency of such electronic assembly adhesives.

Other Adhesive Types

We have just discussed the main adhesives that are employed in the electronic industry. But those are not all the adhesives in the industry. Other types of adhesives are also used in the electronic industry today.

Cyanoacrylates

These adhesives are mostly noted for their wire-tacking abilities. They are commonly referred to as super glues. This single-part kind of adhesive cures extremely fast when exposed to the atmosphere.

When an activator is used along with this adhesive, it even fast-tracks the curing process more.

Silicone Resins

These adhesives look more like sealants than structural adhesives. They are used for encapsulation and conformal coatings. Silicone resins possess high and low heat resistant properties, which makes them ideal to function between -60 degrees Celsius and +200 degrees Celsius.

However, silicone resins can be problematic when used as electronic assembly adhesive for bonding and painting. Their release of certain compounds can lead to surface contamination over a period of time.

Polyimides

These are high-temperature adhesives employed in electronics applications that utilize high temperatures for their operations. They are mostly used for flexible circuits and wire coatings. Their curing cycles are quite difficult compared to other electronic assembly adhesive.

There are other electronic assembly adhesives employed in the electronics industry that may not have been mentioned here. It is also possible that many other adhesives will be produced in the near future.

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Final Words

The electronics market comprises of various industries like the computer, communications, consumer electronics, and other industries. They all use PCBs as the building block for all products. This post has disclosed the role of electronic assembly adhesive in all the industries mentioned above. We also emphasized that there are different adhesives for different purposes. It is obvious that the adhesive industry will continue to expand based on a number of factors. Take advantage of the many thermally and electrically conductive adhesives to improve your electronics products today.

For more about choosing an introduction to the use of electronic assembly adhesive, you can pay a visit to DeepMaterial at https://www.epoxyadhesiveglue.com/category/electronic-adhesives-glue/ for more info.