Underfill Application Example

Underfill Process for Dispensing of Insulating Adhesives

Underfill is a process in which an insulating Adhesive (e.g. epoxy) is dosed along the edges of e.g. a Microchip and then, by capillary effect, it fills the space between the Component and PCB. The adhesive ensures better adhesion of the Component to the PCB and protects against Mechanical Stresses and last but not least, it prevents electromigration. The Adhesive is typically thermally cured.

preeflow® impresses XENON

Consistently high quality and absolutely precise dispensing: Characteristics that are part of everyday work for XENON Automatisierungstechnik GmbH. Thanks to the use of precise dispensing systems, the company is enabled to work on a variety of components and even under vacuum. It goes without saying that XENON wanted to maintain its high quality standards in dispensing as well.


Choosing the right dispenser was not difficult for XENON: the required dispensing volume range, the uncomplicated implementation and the precise accuracy of the preeflow dispensers quickly impressed the company. The fully automatic dispensing system offers precision and reliability. And is therefore the perfect partner for XENON.

preeflow Underfill advantages:

  • Precise dispensing
  • Complete control of the underfill process
  • High repeatability

“The spindle dispensing system is controlled directly via the plug´n´dose box and the SPS, so that the volume flow can be easily adjusted to the processing path.”XENON Automatisierungstechnik GmbH

Our Services

Product tests and validation by preeflow

Help with the selection of dispensing components and small dispensing systems

Combination of complete dispensing systems or dispensing equipment

Publication of all tested materials with manufacturer’s approval

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Further products

Preeflow ecoPen Familie

1-component dispenser

The 1-component dispenser: Your perfect partner for low to high viscosity dispensing.

Preeflow ecoDUO Gruppe

2-component dispenser

The 2-component dispenser: Simple and precise dispensing of previously unattained small quantities.

Preeflow ecoSPRAY

Spray dispenser

The spray dispenser: Perfect spraying of fluids in the low to high viscosity spray range.

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preeflow® – automated dispensing systems

More than 25 years of experience in fluid dosing. ViscoTec distinguishes itself with its comprehensive know-how in dispensing technology. In 2008, this wealth of experience was expanded with the introduction of the preeflow brand. With success: For 15 years, preeflow has stood for precise and purely volumetric dispensing of fluids in small and very small quantities. All over the world, a wide variety of industries rely on preeflow products. Always following our philosophy: Smaller, more precise, economical.