Dielectric Resins for encapsulation and potting

Dielectric Resins

Dielectric resins are used to coat or encapsulate electrical components to protect them from damage due to voltages and currents.

They are made from synthetic polymers and have a number of properties that make them ideal for this purpose. Dielectric resins are electrical insulators, meaning that they do not conduct electricity. This is crucial in electrical equipment, as it helps to prevent electrical shorts and other types of electrical failure.

In addition to their insulating properties, dielectric resins also have high dielectric strength, which refers to the maximum voltage that can be applied across the resin before it breaks down and loses its insulating properties. This high dielectric strength makes dielectric resins ideal for use in electrical components that are exposed to certain voltages and currents, such as transformers and capacitors.

Dielectric resins also provide mechanical protection to electrical components. This protection helps to reduce the risk of damage to the components due to impacts, vibrations, and other types of physical stress.

The use of dielectric resins can improve the overall durability and reliability of electrical equipment, as well as extending its lifespan.

Dielectric resins play an important role in protecting electrical components and improving the reliability and performance of electrical equipment. By insulating and protecting these components, dielectric resins help to reduce the risk of electrical failure and improve the safety of electrical systems.

AMT Composites has several casting resins for mechanical and numerous electrical applications especially for low or medium voltage.

Use examples:

    • Insulating and protecting electrical components such as transformers, capacitors, and motor windings.
    • Inductive elements, capacitors.
    • Electronic cards and components.
    • Encapsulating and potting electronic devices to protect against environmental factors such as moisture and vibration.

We have a variety of options to meet your needs.

The table includes a list of our most popular Dielectric Resins for encapsulation and potting.

What is encapsulation and potting?

Encapsulating and potting electronic devices refers to the process of coating electronic components with a layer of dielectric resin to protect them from the environment and mechanical stress. The resin forms a protective barrier around the components, preventing exposure to moisture, dust, and other contaminants that could cause corrosion or damage. Additionally, the resin helps to stabilize the components and reduce the risk of mechanical damage due to vibrations or impacts.


In encapsulating, the electronic components are placed in a mold and the resin is poured over them, surrounding them completely. This provides a high degree of protection for the components and is often used for larger electronic devices or components that need to be protected from the environment.


Potting involves filling a container with resin, and then placing the electronic components inside. The resin is then allowed to cure, creating a solid, protective barrier around the components. This is often used for smaller electronic devices or components that are more susceptible to mechanical stress, as the resin helps to dampen vibrations and absorb shocks.

Overall, encapsulating and potting electronic devices with dielectric resins helps to improve their reliability and longevity, and reduce the risk of damage or failure. By protecting the components from the environment and mechanical stress, dielectric resins help to ensure the long-term performance and functionality of electronic devices.

Need assistance?

Contact AMT Composites product specialist Steven Coetzee on 011 392 4232.

Dielectric Resins for encapsulation and potting

ProductShore HardnessFlexible / Semi Rigid / RigidUnique Property / ApplicatioTemperature Rating
(Post-cure may be required)
Resin BaseColourUsage Examples
RE33/HE3338 AFlexibleRe-Enterable40-50°CPolyurethaneClearEncapsulation of electrical components where Re-enterablity is needed
SikaBiresin RE 880-95 / RE 102
(previously RE 11880-(95) / RE 1020)
88 AFlexibleShock Resistant,
Good Adhesion
130°CPolyurethaneBlackpotting electronic cards and components
SikaBiresin RE 560 / RE 102
(previously RE 12560 / RE 1020)
56 DSemi RigidWater Resistant120°CPolyurethaneBlack / Whitetransformers, inductive elements, electronic cards and components.
SikaBiresin®RE 891 / RE 203
(previously RE 22891-(98) / RE 2030)
88 DRigidSelf Extinguishing
UL 94: V0
UL 746B: RTI 90 °C
150°CEpoxyBlackcapacitors, coils, transformers, protection electrical motor

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