„Damming“ describes the application of a bead of highly-viscous dispensing media onto one half of a substrate. The dispensing material in this case serves as either a sealant or a connector between the two halves of the component.


Damming with viscous sealants is used where electronic components must be protected from external chemical, corrosive or mechanical influences. For example, in housings of automotive control elements or in photovoltaic equipment. The dispensing media used are the so-called high-viscosity casting resins based on polyurethane, silicone or epoxy.


The goal is to extend the assembly’s service life and to optimise its functionality.



Pros of viscous sealants:

• Suitable for complex geometries of the component – in three dimensions
• Material can be applied automated
• Adapts quickly and easily to different component shapes
• Completely fills surface roughness or gaps
• Possibility of extremely thin sealant layers
• Seal does not shrink or change its shape

Damming and Sealing



Curing


Case Report