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Using PCB smt underfill epoxy and bga underfill material for different applications

Using PCB smt underfill epoxy and bga underfill material for different applications

Underfill applications make use of different adhesive compounds to fill up gaps that exist between PCBs and microchip packages. This is very important because different chip packages, like chip scale packages and ball grid arrays, have to be surface mounted.

This is not the same as the dual inline packages used in the past. These have metal leads inserted in the PCB holes and then soldered. The metal leads offered a secure PCB mount. However, there was a breakage issue of the PCB connections because of mechanical and thermal stresses.

Today, epoxy can be applied to the edges of chip packages. After applying heat, the adhesives will flow through capillary action below the chip.

Best Pressure Sensitive Adhesive Manufacturers In China
Best Pressure Sensitive Adhesive Manufacturers In China

Application methods

Various application methods can be used to underfill epoxy.

  • Full underfill: in this case, they ensure that the space that exists between the PCB and chip package is covered
  • Edge bonding: in this case, a short distance is filled under the chip package edge
  • Corner staking: this applies adhesive at the corners

Important adhesive flow properties

Different things must be considered when picking the right to underfill epoxy. Choosing correctly means ease of application and a superior cure. Some of the flow properties include:

  • Low viscosity: this makes it possible for the adhesive to flow in small spaces if needed
  • Low thixotropy: this is to say that the adhesive viscosity remains  constant even with time passage and the application of shear stress
  • Good wetting: this allows the formation of a good bond between the PCB and the chip package
  • Anti-foam properties: this helps avoid any air bubbles within the cured adhesive

For an adhesive to be a good underfill, it has to possess some good mechanical properties. These include drop impact resistance determined by toughness. The other thing is a low thermal expansion which means that it can resist shear stress. Low moisture penetration and chemical absorption ensure that the solder connections remain protected from issues such as corrosion.

Underfill encapsulants

In many cases, these are made using epoxy materials. They are commonly used in electronic assemblies to deal with gaps between flip chip components and the PCBs. The components remain protected against vibration, thermal cycling drop, and shock impacts.

At DeepMaterial, you can find some amazing underfill epoxies with unique features, including small gap applications and good flow.

Epoxy is one of the most popular materials that is being utilized in a wide range of applications and industries today. This owes to its superior qualities, which makes it stand out from the rest.

Finding a good manufacturer/ supplier

Underfills are an important part of the assembly in different industries. With the elimination of soldering in sensitive components, adhesives have come in to offer a durable and stable solution that can last for years.

Underfill epoxy protects components from moisture, heat, shock, and vibration. Finding the right manufacturer offering high-quality epoxy underfill ensures that your processes are not compromised.

Best Industrial Epoxy Adhesives Glue And Sealants Manufacturers In USA
Best Industrial Epoxy Adhesives Glue And Sealants Manufacturers In USA

At DeepMaterial, there is a wide range of products that you can choose from. We work at creating the right products to fit various situations. We can custom-make solutions for you if the need arises. Please browse through our products and talk to us about the best underfill epoxy for your industry and needs.

For more about using PCB smt underfill epoxy and bga underfill material for different applications,you can pay a visit to DeepMaterial at for more info.

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