SilSo Lite 21025 – Liquid Silicone Foam for Potting & Encapsulation
SilSo Lite 21025 – Liquid Silicone Foam for Potting & Encapsulation
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Premium Two-Component Silicone Foam for Professional Applications
SilSo Lite 21025 is a two-component, room-temperature platinum-cure silicone foam, developed specifically for liquid dispensing with automated dispensing systems. It combines low viscosity with a fast cure and excellent thermal protection – ideal for lightweight potting and encapsulation of complex components.
Key Benefits
- Low viscosity (17,000 cP mixed): Excellent flow around complex components and into tight spaces.
- Fast room-temperature cure: Gel time of 90 seconds at 25 °C – efficient production rates without an oven.
- Fire-safe (UL-94 V-0): Certified low smoke and toxicity profile on combustion (UL File QMFZ2.E205830).
- Primerless adhesion: Chemical adhesion at room temperature to a range of substrates without pre-treatment.
- Hydrolytically stable & reversion-resistant: Long-term reliability in humid and thermally stressed environments.
- Electrical insulation & shock protection: Protects components against environmental influences and mechanical stress.
Typical Applications
- Lightweight potting and encapsulation of electronics
- EV battery modules – thermal protection and weight reduction
- PCB staking and component fixing
- Thermal insulation in industrial equipment
- Protection of sensors and connectors in automotive applications
- Aerospace: lightweight sealing of electronic assemblies
Technical Characteristics
Mix ratio 1:1 by volume (1.17:1 by weight). Part A (black, 1.17 g/cm³) contains the platinum catalyst; Part B (colourless, 1.00 g/cm³) is the curing agent. Cured product: opaque black foam with a density of 0.4 g/cm³, elongation at break 70%, maximum service temperature 200 °C, thermal conductivity 0.067 W/mK. Storage temperature max. 38 °C, shelf life 12 months. Dispensing through a static mixer is recommended (e.g. 8×8 mm, 32 elements, at 1–2 g/s).
CHT Germany GmbH is a specialist manufacturer of high-performance silicones and functional chemicals, based in Tübingen, Germany. CHT supplies technical silicones for demanding industrial applications worldwide.
Professional Support
Do you have questions about the right application, dispensing equipment or process optimisation? Our technical team will be happy to advise you on using SilSo Lite 21025 in your specific production environment. Contact us for tailored advice.
Product Properties
- ColorBlackColor of the finished product
- TransparencyOpaqueDegree of transparency
- Viscosity17000mPa·sViscosity of the uncured silicone
- Density0.4g/cm³Density of the cured material
- Mix ratio1.17:1Mixing ratio A : B
- Elongation at break70%Maximum stretch before breaking
- Pot life1minutesWorking time after mixing
- Cure time2minutesTime until full cure
Component Properties
- Color ABlackColor of component A
- Color BTranslucent whiteColor of component B
- Viscosity A20000mPa·sViscosity of component A
- Viscosity B12000mPa·sViscosity of component B
- Density A1.17g/cm³Density of component A
- Density B1.0g/cm³Density of component B
Thermal Properties
- Max. temperature200°CMaximum service temperature
- Thermal conductivity0.067W/m·KHow well heat is transferred
- Cold flexibility-60Remains flexible at low temperatures
Electrical Properties
- Electrically insulatingYesPrevents electric current flow
Certification & Safety
- Flame retardantYesSlows down fire spread
- Fire classUL 94 V-0Fire safety classification
- Chemical resistanceGoodResistance to chemicals
- Moisture resistantYesResistant to moisture and water absorption
Application
- Use casePotting and encapsulation of electronics, insulation, EV batteries, PCBsIntended use
- Silicone type["Addition cure","RTV-2","Foam"]Type of silicone or polymer
- Cure speedFastHow quickly the material can be demoulded
Safety Information
GHS: H361f (suspected of damaging fertility), H412 (harmful to aquatic life). Contains octamethylcyclotetrasiloxane (SVHC). Wear butyl rubber gloves and safety glasses. Use in a well-ventilated area. Avoid release to the environment.| Safety Pictograms | Safety Data Sheets (SDS) |
|---|---|
GHS hazard pictograms
 
Required protection (ISO 7010)
  |
| Signal Word | H‑code | Hazard Statement | P‑codes | P‑statements |
|---|---|---|---|---|
| Warning | H361f | - | - | |
| Warning | H412 | Harmful to aquatic life with long lasting effects | P273 P501 |
|
Technical data sheets
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Frequently asked questions
What is the delivery time for my order?
Orders placed and paid on working days are in most cases shipped the same day. Weekend orders are processed on the next working day.
Indicative delivery times: Netherlands usually within 1 working day, Belgium and Germany typically 1–2 working days, other countries depending on destination and carrier. These are guidelines, not guarantees: peak periods, public holidays or carrier delays can have an effect.
What is the return policy?
You have 30 days to return after receipt. Email info@siliconesandmore.com within 30 days of delivery with your name and order number. The full conditions are in our return policy.
How can I track my order?
As soon as your order has shipped, you'll receive a track & trace code by email. It can take up to 24 hours before the code is active.
I have a problem with my order – how do I reach you?
Contact us via our contact page or email info@siliconesandmore.com. We're happy to help you quickly.
Can I order as a business?
Yes. Apply for a business account; we review your application within 3 working days. After that you order while logged in and pay on invoice, with payment terms of 14 days after delivery.
EU businesses outside the Netherlands with a valid VAT number order with VAT reverse-charged (0%, intra-community supply). The VAT number is stored in your business account; it cannot be added to an order after it has been placed.