Crystal-clear, soft silicone potting compound for electronics, PCBs and LEDs
ADDV-10-EG CRYSTAL CLEAR is a low-viscosity, addition-curing 2-component silicone for transparent encapsulation and potting of sensitive electronic and electromechanical components.
With a dielectric strength of 15–22 kV/mm, a volume resistivity of > 1 × 1015 Ω·cm and a dielectric constant of 2.9 at 1 MHz, the material is particularly suitable for printed circuit boards, electronic assemblies, sensors and LED applications.
Its low mixed viscosity of 600 ± 150 mPa·s allows the compound to flow easily around small components and into narrow gaps. After curing, it forms a very soft, elastic encapsulation with a hardness of 10 ± 2 Shore A, helping to protect sensitive components while reducing mechanical stress and vibration.
Special offer: 20% discount on fully compliant A-grade material.
The reduced price is part of a promotional campaign and is not related to any quality defect.
ADDV-10-EG CRYSTAL CLEAR was developed primarily for the potting and encapsulation of electronic components. According to the manufacturer, the material is used for PCB potting and is also suitable for LED encapsulation applications.
Unlike conventional mould-making silicones, the main benefit of this product is not high tear strength for flexible moulds, but the soft, electrically insulating and transparent encapsulation of sensitive components.
Its low viscosity enables the silicone to flow into narrow spaces and around small components. At the same time, the cured material remains very soft at Shore A 10. This makes it particularly suitable for assemblies where rigid potting compounds could transfer mechanical stress to sensitive components, solder joints or connecting wires.
Technical data
| System |
2-component, addition-curing silicone |
| Colour / appearance |
Crystal clear, transparent |
| Mixing ratio A : B |
100 : 100 parts by weight (= 1 : 1) |
| Mixed viscosity |
600 ± 150 mPa·s |
| Density |
0.95 g/cm³ |
| Pot life at 25 °C |
30–60 minutes |
| Curing time at 25 °C |
4–6 hours |
| Hardness |
10 ± 2 Shore A |
| Linear shrinkage |
≤ 0.2% after 7 days at 23 °C |
Electrical and thermal properties
| Dielectric strength |
15–22 kV/mm |
| Volume resistivity |
> 1 × 1015 Ω·cm |
| Dielectric constant |
2.9 at 1 MHz |
| Thermal conductivity |
≥ 0.2 W/(m·K) |
| Temperature range according to manufacturer |
−60 to +240 °C* |
| Flammability |
Manufacturer information: UL 94 HB* |
* Manufacturer information. No additional information on test methods, specimen configuration or an independent UL certification of the product is currently available to us. For safety-critical applications, application-specific testing is therefore required.
Advantages
- Developed for electronic potting: particularly suitable for encapsulating PCBs and electronic assemblies.
- Excellent electrical insulation: dielectric strength of 15–22 kV/mm and volume resistivity of > 1 × 1015 Ω·cm.
- Crystal clear: components, indicators and assemblies remain visible after encapsulation.
- Low viscosity: 600 ± 150 mPa·s for good flow around small components and into narrow gaps.
- Very soft and elastic: Shore A 10 ± 2 provides flexible encapsulation of sensitive components.
- Mechanical stress relief: the elastic potting compound can help reduce vibration and local mechanical stress.
- Low shrinkage: ≤ 0.2% after 7 days at 23 °C.
- Addition curing: cures without releasing volatile condensation by-products.
- Simple mixing ratio: components A and B are mixed in equal parts by weight.
Typical applications
ADDV-10-EG CRYSTAL CLEAR is particularly suitable as a transparent, soft silicone potting and encapsulation compound for electrical and electronic components:
- PCB potting and encapsulation
- electronic assemblies and modules
- LED potting and LED assemblies
- displays and electronic indicators
- sensors and measuring assemblies
- control and connection components
- electrical terminals and contact areas
- sensitive electromechanical components
- prototypes, small production runs and custom electronic assemblies
The combination of electrical insulation, high elasticity and transparency makes the material particularly suitable where electronic components need to be protected without being rigidly locked into a hard potting compound.
Transparent encapsulation for LEDs and visible electronics
ADDV-10-EG CRYSTAL CLEAR cures to a transparent finish and can therefore also be used where light needs to pass through the encapsulant or where the embedded component should remain visible. Typical examples include LEDs, displays, sensor assemblies and electronics that still need to be visually inspected after potting.
No specified manufacturer data is currently available for light transmission, refractive index or long-term UV/yellowing resistance. For optically demanding applications and permanent UV exposure, we therefore recommend carrying out a preliminary test under actual service conditions.
Processing
Mix components A and B thoroughly at a ratio of 1 : 1 by weight. At 25 °C, the pot life is approximately 30–60 minutes. Curing at room temperature takes approximately 4–6 hours.
For a clear, low-bubble finish, avoid entraining unnecessary air during mixing. Where high optical quality is required, trapped air can be removed by vacuum degassing after mixing.
Components must be clean, dry and free from contamination before potting. For unknown plastics, coatings, conformal coatings or other contact materials, a compatibility test is always recommended.
Important information for addition-curing silicones
The curing reaction of addition-curing silicones can be inhibited by certain contaminants. Inhibition may result in sticky, noticeably softer or incompletely cured areas.
- Preferably use nitrile gloves during processing; latex may interfere with platinum-catalysed curing.
- Mixing containers and tools must be clean and free from residues of other materials.
- Avoid contact with sulphur compounds, amines, condensation-curing silicones and other potentially inhibiting substances.
- Always perform a compatibility test with unknown materials, coatings or component surfaces.
- ADDV-10-EG CRYSTAL CLEAR cannot be pigmented with R&G Universal Colour Pastes.
Not intended as a conventional mould-making silicone
Due to its comparatively low tear strength, ADDV-10-EG CRYSTAL CLEAR is not intended for the production of mechanically demanding silicone moulds. Its strengths lie specifically in electronic potting, electrical insulation and the soft, elastic encapsulation of sensitive components.
FAQ
Is ADDV-10-EG suitable for PCB potting?
Yes. Potting of electronic assemblies and printed circuit boards is one of the applications stated by the manufacturer. A compatibility test is recommended for unknown conformal coatings, PCB finishes, housing materials or other contact materials.
What electrical insulation properties does the material provide?
The manufacturer specifies a dielectric strength of 15–22 kV/mm and a volume resistivity greater than 1 × 1015 Ω·cm. The dielectric constant is 2.9 at 1 MHz.
Can the potting compound be used for LEDs?
Yes. LED potting is stated by the manufacturer as a typical application. Because the material is transparent, it is particularly suitable where light needs to pass through the encapsulant. As no specified values are available for light transmission, refractive index or long-term yellowing, a preliminary test is recommended for optically demanding applications.
How soft is the cured silicone?
With a hardness of 10 ± 2 Shore A, the material remains very soft and elastic. This allows sensitive components to be flexibly embedded and mechanically decoupled from vibration and stress.
Is ADDV-10-EG thermally conductive?
The manufacturer specifies a thermal conductivity of at least 0.2 W/(m·K). The material should therefore not be regarded as a specialised high-thermal-conductivity potting compound, although this value is relevant for the thermal design of electronic assemblies.
Can ADDV-10-EG be used as a mould-making silicone?
This is not the intended application. For conventional silicone moulds, we recommend R&G mould-making silicones designed for higher tear and tear-propagation resistance.
Can components A and B be ordered separately?
No. The two components are batch-matched and are therefore supplied exclusively as a corresponding A+B set.
MSDS component A (PDF)
