Silicone Addition Gel 840 Clear – Transparent Silicone Gel for Potting Electronics & Optical Components
Silicone Addition Gel 840 Clear – Transparent Silicone Gel for Potting Electronics & Optical Components
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In stock
Ordered and paid on a working day: usually ships the same day
Delivery to Netherlands: usually within 1 working day
In stock
Ordered and paid on a working day: usually ships the same day
Delivery to Netherlands: usually within 1 working day
In stock
Ordered and paid on a working day: usually ships the same day
Delivery to Netherlands: usually within 1 working day
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Premium Clear Silicone Gel for Professional Electronics and Optics Applications
Silicone Addition Gel 840 Clear is a pourable, addition-curing (platinum) RTV-2 silicone that cures at room temperature into a crystal-clear, colourless gel. Both components are colourless and are mixed 1:1 by weight (100 parts A to 100 parts B). With a viscosity of 125 cSt the mixture is very free-flowing and self-degassing. The pot life is 80 minutes at 22 °C; after 24 hours at 20 °C the gel is functionally crosslinked and after 2 days it is fully cured. The cured gel has a penetration of 60 (1/10 mm) and therefore remains soft: measuring points on electronic components can still be reached with a test probe, after which the gel closes again sufficiently against moisture when worked carefully. With a dielectric strength of 15 kV/mm and a volume resistivity of 3 × 1015 Ω·cm, Gel 840 is ideally suited for potting electronics and optical components.
Key Benefits
- Crystal clear and colourless: after mixing the gel becomes completely clear – above 30 °C a very faint yellowish tinge may develop over time, which is not a problem for most potting applications.
- Viscosity 125 cSt: very free-flowing and self-degassing – the mixture penetrates into the smallest gaps around components.
- Penetration 60 (1/10 mm): soft, shock-absorbing gel – measuring points remain accessible and the gel closes again against moisture after being pierced.
- Dielectric strength 15 kV/mm: electrically insulating with a volume resistivity of 3 × 1015 Ω·cm – suitable for protecting circuit boards and modules.
- Pot life 80 minutes at 22 °C: ample time to weigh, degas and pour – even for larger potting volumes.
- Mix ratio 1:1 by weight: easy to weigh and to mix by hand or by machine – A and B are always supplied in equal quantities.
Typical Applications
- Potting of circuit boards and electronic modules that must remain measurable afterwards
- Protecting and insulating sensors and electronics against moisture, vibration and shock
- Embedding optical components where a clear, colourless layer is required
- Potting lighting objects and light art, such as the application by Hypar Collective in the video on this page
- Encapsulating small electronic assemblies in prototyping and small production runs
Processing instructions:
- Stir component A and component B separately and thoroughly before use.
- Weigh both components accurately in a 1:1 ratio by weight (100 parts A to 100 parts B). Only use A and B components with the same lot number, mixing different lots can cause curing problems.
- Mix carefully but slowly, preferably in a figure-of-eight motion, by hand or by machine until homogeneous, without stirring in air.
- Preferably degas the mixture in a vacuum chamber immediately after mixing to prevent air bubbles.
- Pour the mixture within the pot life of 80 minutes (22 °C).
- Allow the gel to cure: functionally crosslinked after 24 hours at 20 °C, fully cured after 2 days. Curing in an oven speeds up the process, but leaves more air bubbles in the gel. Pot life and cure time are highly temperature dependent: the warmer, the shorter both become.
The gel can be coloured with silicone colourant, either intensely or while remaining clear. Stored in a closed container, cool and frost-free, the product has a shelf life of at least 1 year. The components are always supplied as a set and are not available separately; for larger pack sizes, please contact us.
Silicones and More, specialist in high-quality mould rubbers and casting materials for professional makers.
Important Warning: Inhibition with Addition Silicones
Please note: This is an addition-curing silicone (platinum cure). Curing can be inhibited by sulphur, nitrogen, amine compounds and metal salts. If you are not sure whether the materials you use (including gloves, spatulas and cups) contain these substances, do a small test first. Inhibiting substances are found in, among others, latex gloves, some plasticines, adhesives and lacquers, condensation silicones, silicone sealant, natural rubber and 3D printing materials (especially stereolithography). On an inhibiting surface, apply a barrier layer of polyvinyl alcohol (PVA).
Professional Support
Silicone Addition Gel 840 Clear remains a soft gel after curing. If you need a firmer but still clear potting compound, take a look at Silicone Addition Clear 0 or Silicone Addition Clear 5. Not sure which one best suits your application? Contact us at info@siliconesandmore.com, we are happy to help.
Product Properties
- Penetration601/10 mmSoftness of the cured gel
- ColorTransparentColor of the finished product
- TransparencyTransparentDegree of transparency
- Viscosity118mPa·sViscosity of the uncured silicone
- Density0.94g/cm³Density of the cured material
- Mix ratio1:1Mixing ratio A : B
- Pot life80minutesWorking time after mixing
- Functionally cured1440minutesTime until functional crosslinking
- Cure time2880minutesTime until full cure
Physical Properties
- Flash point28°CMin. temperature at which the product ignites
Component Properties
- Color AColourlessColor of component A
- Color BColourlessColor of component B
- Viscosity B5mPa·sViscosity of component B
- Density A0.97g/cm³Density of component A
- Density B0.92g/cm³Density of component B
Electrical Properties
- Electrically insulatingYesPrevents electric current flow
- Dielectric strength15.0kV/mmMaximum voltage before electrical breakdown
- Volume resistivity3 × 1015Ω·cmElectrical resistance of the material
Application
- Use casePotting of electronics, sensors and optical componentsIntended use
- Silicone type["Addition","RTV-2","Gel"]Type of silicone or polymer
- Cure speedNormalHow quickly the material can be demoulded
- Cure conditionRoom temperature or heatCondition under which the material cures
- Shelf life12monthsIn unopened original packaging
Safety Information
Component A is not classified as hazardous under the CLP Regulation (EC) 1272/2008. Component B is classified as a flammable liquid category 3 (H226: flammable liquid and vapour, flash point approx. 28 °C) and as toxic to reproduction category 2 (H361f: suspected of damaging fertility), signal word Warning. Component B contains 1 to 5 % octamethylcyclotetrasiloxane (D4). Work in a well-ventilated area, preferably with local exhaust ventilation, and keep the product away from heat, sparks and open flames; take precautions against static discharge. Wear protective gloves to EN 374, tight-fitting safety goggles (a face shield where there is a risk of splashing) and suitable protective clothing. With insufficient ventilation or when handling larger quantities, respiratory protection with filter type ABEK is required. For full information, consult the safety data sheets for component A and component B on this page; the safety data sheet supplied with the product is authoritative. For transport, component B falls under UN1993, class 3, packing group III.| Safety Pictograms | Safety Data Sheets (SDS) |
|---|---|
GHS hazard pictograms
 
Required protection (ISO 7010)
     |
| Signal Word | H‑code | Hazard Statement | P‑codes | P‑statements |
|---|---|---|---|---|
| Warning | H226 | Flammable liquid and vapour | P210 P233 P280 P303+P361+P353 P370+P378 |
|
| Warning | H361f | - | - |
Technical data sheets
YouTube
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.