Potting Compounds and Encapsulation Resins for Electronics
Maximum Protection for Sensitive Components
Our potting compounds, also known as encapsulation resins, protect electronic and electrical assemblies against moisture, chemicals, shock, and extreme temperatures. These systems fill the entire housing, replace the air around the components, and keep them working reliably in the field. Whether in automotive, e-mobility, energy, or industrial applications, our casting resins based on epoxy, polyurethane, and silicone are formulated for your part, your process, and your production line. Benefit from high thermal and mechanical strength, controlled curing, efficient heat dissipation, and more than 40 years of experience in reactive resin systems.
What Is a Potting Compound?
A potting compound is a liquid reactive 2-component resin that is dispensed into a housing and cured to fully embed an electronic assembly. Once cured, it replaces the air inside the housing and takes over several jobs at once. It insulates live parts, conducts heat away from the components, seals the assembly against moisture, dust, and chemicals, and absorbs shock and vibration. Because the compound bonds to both the components and the housing, it also stabilizes the assembly mechanically and protects the design against reverse engineering.
Which properties dominate depends on the formulation. Hardness, elasticity, thermal conductivity, curing behavior, and flame retardancy can be adjusted within wide limits, which is why potting compounds are developed for a specific application rather than bought off the shelf.
Potting Compound, Encapsulation Resin, or Casting Resin?
The three terms overlap and are often used for the same product. Potting compound is the common term in North America for the material used to embed electronics. Encapsulation resin describes the same material from the process side and is widely used in the UK and in India. Casting resin is the broader category and also covers applications outside electronics, from tooling to construction. At RAMPF, all three come from the same material family: two-component reactive resins based on polyurethane, epoxy, or silicone.
Potting vs. Conformal Coating
A conformal coating is a thin dielectric layer applied to the surface of a circuit board, typically well below 0.005 inch. It follows the contour of the components and protects mainly against humidity and light contamination. Potting works differently. The compound fi lls the housing completely and encloses the assembly in a solid body of material.
That difference decides the selection. Potting is the right choice when the assembly has to withstand mechanical load, vibration, or immersion, when heat has to be conducted out of the housing, when high voltages require dielectric strength, or when aggressive media are present. A conformal coating is the better fi t when tight tolerances, low weight, or a fast, thin-fi lm process are the priority. Many designs use both, with a coating on the board and a potting compound in the enclosure.
Properties and Functions
- High mechanical strength and thermal strength for long-term reliability
- Efficient heat dissipation reduces thermal stress and prevents overheating
- High chemical and temperature resistance for harsh environments
- Customizable processing time for flexible production processes
- RoHS-compliant and UL-certified to meet the highest safety standards
Your Key Benefits
Services at a Glance
- Material expertise: Epoxy, polyurethane, and silicone potting compounds
- Process know-how: Advanced mixing and dispensing technology for precise potting
- Full-service approach: Material, machinery, and processing technology from a single source
- Custom solutions: Tailor-made formulations to meet your exact requirements
Material Types
Every potting compound starts with the material base. Polyurethane, epoxy, and silicone systems cover different temperature ranges, adhesion profi les, and mechanical properties. The following overview shows the technical data of our RAKU® product families.
Chemical reaction
- Two-component
- Polyaddition reaction
- Minimal exothermic reaction
- Cures at room temperature
- Curing conditions can be flexibly adjusted by adding a catalyst
- Low shrinkage pressure on cast components
Area of application
- Temperature range: -60 to +155 °C, short-term: +160 °C
- Wide range of mechanical properties, from tough to highly elastic
Properties
- Excellent resistance to fluctuations in temperature for sensitive components
- High crack resistance for flexible products
- Good chemical resistance
- Low water absorption
- Impressive electrical properties
- Tg: from -75 to +120 °C
- RTI: to 155 °C
- OBJS2-listed
Adhesion
- Good adhesion to housings and components
- Good adhesion to plastics such as PA, PBT, and ABS
Flame retardancy
- Can be adapted to UL 94 V0
Learn more!
Chemical reaction
- One or two components (1C or 2C)
- Homopolymerization (1C) and polyaddition reaction (2C)
- Cures at room temperature
- Curing can be accelerated using heat
- Heat curing required for one-component and hot-curing epoxy
- Good impregnation properties
- Low sensitivity to moisture
Area of application
- Temperature range: -40 to +180 °C, short-term: +200 °C
Properties
- High thermal dimensional stability
- Low coefficient of thermal expansion
- High dielectric strength
- High media resistance to fuels
- Low water absorption and water vapor permeability
- Tg: -20 to +180 °C
- OBJS2-listed
Adhesion
- Good adhesion to metals
Flame retardancy
- Can be adapted to UL 94 V0
Learn more!
Chemical reaction
- One or two components
- Polyaddition and polycondensation reaction
- Minimal exothermic reaction
- Cures at room temperature
- Curing can be accelerated using heat
- Curing without by-products possible (polyaddition reaction)
- Low shrinkage pressure on cast components
- Low sensitivity to moisture
- Hydrophobic
Area of application
- Wide temperature range: -60 to +200 °C, short-term: +250 °C
- Optimum physical properties, virtually constant over the entire application temperature range
Properties
- Very good resistance to temperature fluctuations
- High crack resistance
- Excellent chemical resistance for extreme environments
- Low water absorption
- High water vapor permeability
- Impressive UV and weather resistance
- Tg: always < 0 °C
Adhesion
- Good adhesion to mineral substrates
- Adhesion to other substrates often only with pre-treatment
Flame retardancy
- Can be adapted to UL 94 V0
Learn more!
Find here more information on processing diisocyanates according to REACH, Annex XVII, Entry 74:
How to Select the Right Potting Compound or Encapsulation Resin
The right material follows from the application, not from a data sheet ranking. Six questions usually decide the selection.
Operating temperature: Up to +155 °C, a polyurethane potting compound covers most requirements. Between +155 °C and +180 °C, epoxy is the standard choice. Above that, and for wide temperature swings, silicone keeps its properties across the entire range from -60 °C to +200 °C.
Stress on the components: Sensitive components, fi ne bond wires, and large temperature cycles call for a fl exible, low-shrinkage system. Polyurethane and silicone apply little pressure to the embedded parts, while rigid epoxy systems maximize mechanical strength instead.
Heat dissipation: Where power electronics generate heat, thermally conductive fi llers move it out of the assembly and lower the operating temperature of the components.
Media and environment: Fuels, oils, and cleaning agents favor epoxy. Permanent humidity, UV exposure, and outdoor use favor silicone. Low water absorption is available in all three material bases.
Adhesion to the housing: Epoxy adheres particularly well to metals, polyurethane to plastics such as PA, PBT, and ABS. Silicone bonds reliably to mineral substrates and usually needs a primer on other materials.
Standards and fl ame retardancy: All three material bases can be adapted to UL 94 V0. RoHS compliance and UL certifi cation are part of the specifi cation from the start, not an afterthought.
If several requirements confl ict, we adjust the formulation instead of forcing a compromise. That is the difference between a catalog product and a potting compound developed for your assembly.
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FAQ
A potting compound is a reactive 2-component resin that is poured into a housing and cured to fully embed an electronic assembly. It insulates the components electrically, conducts heat away from them, and protects them against moisture, chemicals, shock, and vibration.
An encapsulation resin is the same material as a potting compound. The term is more common outside North America, for example in India. The resin is dispensed into a housing and cured to fully embed an electronic assembly, protecting it against moisture, chemicals, heat, and vibration.
In practice there is none. Potting is the common term in North America, encapsulation is used more widely in the UK and other markets. Both describe the same process of fully embedding an assembly in a cured resin, and encapsulation resin and potting compound refer to the same class of material.
Use potting when the assembly is exposed to mechanical load, vibration, immersion, high voltage, or aggressive media, or when heat has to be conducted out of the housing. Use a conformal coating when weight, tight tolerances, or a thin protective fi lm are the priority. Both can be combined in one design.
Epoxy systems cover continuous operation up to +180 °C and briefl y up to +200 °C. For an even wider range, from -60 °C to +200 °C and short-term up to +250 °C, silicone is the material of choice because its properties stay nearly constant across the whole range.
Yes. With thermally conductive fi llers, a potting compound dissipates heat from the components to the housing wall. This lowers the operating temperature, reduces thermal stress, and extends the service life of the assembly. It is one of the main reasons for potting power electronics.
All three material bases can be formulated to meet UL 94 V0. Our systems are RoHS-compliant and UL-certifi ed, and the required classifi cation is defi ned together with you as part of the specifi cation.
EV battery modules require potting compounds that offer electrical insulation, thermal conductivity, chemical resistance, and flame retardancy. RAMPF's polyurethane and epoxy-based casting resins are available with thermally conductive fillers and UL 94 V-0 certification, making them well-suited for battery cell potting and module encapsulation.
Epoxy systems offer higher hardness, better chemical resistance, and greater thermal stability — ideal for harsh environments or high-temperature applications. Polyurethane systems provide more flexibility, better vibration absorption, and easier reworkability. RAMPF offers both chemistries and can assist with material selection based on your application's thermal, mechanical, and processing requirements.
RAMPF's thermally conductive potting compounds are formulated with mineral fillers to achieve thermal conductivity values suitable for battery gap-fill and thermal interface applications. These resins maintain electrical insulation while efficiently transferring heat away from battery cells, supporting the thermal management architecture of EV and stationary storage systems.
Most EV battery and power electronics applications require potting compounds rated UL 94 V-0 or better. RAMPF offers halogen-free flame-retardant casting resin systems that meet these requirements without compromising mechanical or thermal performance. Compliance documentation and technical data sheets are available for qualification processes.