Condensation Silicone 20 Resin – Molding Rubber for Polyurethane & Epoxy Casting
Condensation Silicone 20 Resin – Molding Rubber for Polyurethane & Epoxy Casting
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All technical specifications, safety information and data sheets remain available below.
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Premium Condensation Silicone for Professional Applications
Condensation Silicone 20 Shore A is a medium-hardness tin-cure molding rubber, specially developed for making durable molds for polyurethane and epoxy casting. This liquid silicone combines excellent detail reproduction with high tensile strength, making it ideal for both prototyping and production work.
Key Benefits
- Excellent fluidity: Captures finest details and textures effortlessly
- High Tensile Strength: Durable molds that can withstand heavy use
- Medium hardness (20 Shore A): Optimal balance between flexibility and stability
- Compatible with PU and epoxy: No inhibition when used with polyurethane and epoxy systems
- Reliable curing: Predictable processing time and consistent results
- Cost-effective: Excellent value for professional use
Typical Applications
- Molds for polyurethane casting (PU foam, elastomers, hard resins)
- Epoxy and acrylic resin casting (Acrylic One, concrete look, decorative objects)
- Prototyping and production work in design and engineering
- Props and set construction for film, theatre and events
- Copying images and ornaments for artists and restorers
- Jewelry and small-scale reproduction in creative industries
Technical Features
This condensation silicone is supplied as a two-component system that is easy to use at room temperature. Its medium hardness of 20 Shore A creates flexible molds that are easy to demould, while its high tensile strength allows for long-term use. Suitable for plaster, concrete, wax, polyurethane, and epoxy.
Note: Pot life (processing time) and demold time depend heavily on the mixing ratio and humidity. Adding more silicone B (hardener) or increasing humidity will shorten the pot life and demold time.
Ironing, Smearing or Spatula
For spreading, spatulating or smoothing silicone you can Thixo C (0.6%-2%, usually 1%) . This thickener makes it possible to spread the silicone. With this processing method, the mold must be provided with a support cap ofplaster cast, epoxy support cap, or acrylic resin with thickener and glass fibre.
Manufactured by Silicones and More , specialists in high-quality moulding rubbers and casting materials for professional makers.
Professional Support
Questions about processing time, mixing ratios, or application possibilities? Our technical team is happy to advise you on the right material for your project.
Product Properties
- Hardness24Shore AHardness of the silicone material
- ColorWhiteColor of the finished product
- TransparencyOpaqueDegree of transparency
- Viscosity18000mPa·sViscosity of the uncured silicone
- Density1.08g/cm³Density of the cured material
- Mix ratio100:5Mixing ratio A : B
- Tensile strength3.92MPaMaximum tensile force before breaking
- Tear strength27.5kN/mResistance against tearing
- Elongation at break450%Maximum stretch before breaking
- Pot life120minutesWorking time after mixing
- Cure time2880minutesTime until full cure
Component Properties
- Color AwhiteColor of component A
- Color BcolorlessColor of component B
- Viscosity A18000mPa·sViscosity of component A
- Viscosity B15mPa·sViscosity of component B
Application
- Use caseMould making for polyurethane and epoxy castingIntended use
- Silicone type["Condensation curing","RTV-2"]Type of silicone or polymer
- Cure speedSlowHow quickly the material can be demoulded
Safety Information
Wear splash goggles, suitable liquid-tight gloves, an apron, and work in a well-ventilated area. See the Safety Data Sheet for more information.| Safety Pictograms | Safety Data Sheets (SDS) |
|---|---|
GHS hazard pictograms
Required protection (ISO 7010)
   |
| Signal Word | H‑code | Hazard Statement | P‑codes | P‑statements |
|---|---|---|---|---|
| Warning | H373 | May cause damage to organs through prolonged or repeated exposure | P260 P501 |
|
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.