Dielectric gels are a special encapsulant with the exceptional capacity to remain a soft and flexible material post-curing. Available as one- or two-part materials, this product category meets the requirements of most applications and process situations. Having said that, it can be effective for use on actuators.
One Or Two-Part Dielectric Gels
As a solventless material, dielectric gels are normally low-viscosity liquids. Although available as one or two-part gels at your local electrical insulation supply store, two-part products are the most commonly designed and distributed with a 1:1 mix ratio, in the form of parts A and B; catering for either a room temperature or a heat accelerated cure.
Products formulated as one-parts evoke ease and convenience for the user since the need for mixing is done away with. However, they of course require a heat cure. Advancements have found that certain specialized one-part gels now can allow for a swift UV cure.
In this latest blog post a more, a closer look is provided at dielectric gels including their features and benefits.
Features & Benefits
One of the most stand-out and impressive characteristics of dielectric gels is the product’s ability to re-heal in case it becomes broken. That being so, dielectric gels come as an extremely resilient material and provide cushioning; while also offering the dimensional stability of an elastomer.
What makes dielectric gels able to re-heal is their natural tacky surface, which forms post-cure. This surface will stick to all typical substrates without requiring the assistance of a primer.
Some outstanding features of dielectric gels are temperature resistance, low modulus, good dampening properties, low viscosity; tacky adhesion at room temperature, and high dielectric strength (>18kV/mm).
This is assured to create reliability along with other useful benefits such as under-the-hood usage, thermal and mechanical stress protection; and a smooth flow around components so blocking the formation of thermally induced voids.
Dielectric gels sold at an electrical insulation supply store have solid stress-relief characteristics, comparable to those of a liquid. As a consequence, this specialist material is extensively used on electronic circuits to isolate the circuit from the damaging effects of contaminants.
Dielectric gels not only offer electrical insulation for high voltages, but they also allow for electronic circuit stress relief and protection, from thermal and mechanical stresses.
A Range Of Applications
There is a range of applications where dielectric gel would come in handy. This could be a material application from standard insulators to applications where dielectric properties are controlled for active device architectures.
Additionally, these can include sensor potting, ECU potting, power module potting; rectifiers, semiconductors, transducers, capacitors; transformers as well as for use with cable joints.
The Final Thoughts
Dielectric gels are a resilient material type that can aid in a large number of complex applications, all because of their significantly low modulus. Dielectric high-temperature gels are silicone dielectric gels, best suited for potting and protecting devices; particularly in PCB and power modules for protecting dies and interconnects from environmental conditions along with providing dielectric insulation.