Dielectric Silicone Gel Materials: Why should you use them?

Dielectric silicone is a popular and reliable material used across multiple industries such as aerospace, automotive, and medical, for protecting, potting, and encapsulating delicate components. Some of the key uses of dielectric silicone gels include:

• Potting and encapsulating sensors, circuit boards, and LEDs
• Protecting equipment in high vibration and impact environments
• Insulating and protecting electronic components exposed to the elements

Potting power modules and sensors is by far the most popular use for dielectric silicone gel materials, but why should you use them? The simple answer is they provide a strong protective seal for sensitive and electrical components, protecting from dust, dirt, chemicals, weather, physical impacts and more… 

What are the benefits of using dielectric silicones? 

Electrical Insulation 

• Great electrical insulators, protecting sensitive circuits against shorting, electrical failure and voltage fluctuations. They also help distribute and manage heat for longevity i.e. LEDs or batteries
• Non-conductive which is crucial in preventing damage when used in high voltage systems 

Thermal management

• A wide operating temperature range, often from -50C to 200C, helping to stop internal components becoming heat damaged

Flexibility 

• They remain flexible after curing, stopping them from cracking and compressing protection, allowing them to absorb mechanical stress and high vibrations
• Ability to conform to irregular shapes and surfaces, ideal for smaller or more complex components

Weatherproofing

• They provide a strong moisture barrier, preventing damage and corrosion in outdoor environments or where materials will encounter liquids. 
• A high resistance to UV radiation

Easy Usability and Fast Curing 

• Most have a low viscosity making them easy to pour
• Room temperature curing
• Considered non-toxic

Why is fast curing at room temperature important?

• Faster and simpler manufacturing, essential for high volume production 
• Less downtime as less steps are needed, unlike materials which need heat or special curing equipment, making it a more cost-effective solution
• Allows for on demand use and on-site applications

Clear and Colourless

Not all dielectric silicone gels are clear and colourless but those that are, have some added benefits: 

• Allows encapsulated components to be inspected for any defects or imcomplete potting 
• Ensures coverage is even and consistent 
• Allows for maximum light transmission when used for LEDs, light sensors and optoelectronic devices, colour would absorb this light, reducing its efficiency
• Can be used across a range of materials without interfering with appearance and looks cleaner and more visually appealing
• Avoids yellowing or discolouration

Products to Consider: 

The Silopren Gel 6209FC from Momentive was specifically developed for electronic potting applications including hybrid IC insulation, power modules, and sensors, when fast room temperature curing is important. Other notable features include being clear, colourless, and easy to pour.

For more information or to speak to one of our technical team contact us on technical@techsil.co.uk.