Silicone Condensation 20 Polyester – Molding Rubber for Polyester Molds & Composite Casting
Silicone Condensation 20 Polyester – Molding Rubber for Polyester Molds & Composite 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 Molds
Silicone Condensation 20 is a tin-cure silicone rubber with a Shore A 20 hardness, specially developed for creating durable molds for polyester, epoxy, and composite casting. This liquid silicone delivers exceptional detail and combines flexibility with very high tensile strength for long-term use.
Key Benefits
- Excellent fluidity: Captures finest details and textures accurately
- Very high tensile strength: Resistant to intensive use and repeated castings
- Optimal flexibility: Shore A 20 hardness for easy demoulding
- Tailored to polyester: Supplied with Wacker hardener T 51, specifically developed for resistance to polyester resins
- Reliable curing: Predictable processing time and consistent results
- Cost-effective: Long life and high yield per mold
Typical Applications
- Molds for polyester and composite parts in the automotive and maritime industries
- Props and set pieces for theatre, film and events
- Sculptures, ornaments and architectural elements in plaster and concrete
- Candle molds and soap molds for artisanal production
- Prototypes and model building for product design
- Precision foundry and art foundry applications
Technical Features
This condensation silicone is supplied as a two-component system, easy to use at room temperature. Its medium hardness (Shore A 20) offers the ideal balance between flexibility and dimensional stability. Suitable for both brush and pouring applications, depending on the complexity of the model.
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 use Thixo C (0.6%-2%, usually 1%) . This thickener makes the silicone easy to spread. With this processing method, the mold must be provided with aplaster bandage support cap. 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
- Viscosity24000mPa·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 Bred brownColor of component B
- Viscosity B50mPa·sViscosity of component B
- Density A1.08g/cm³Density of component A
- Density B0.92g/cm³Density of component B
Thermal Properties
- Max. temperature240°CMaximum service temperature
- Min. temperature-20°CMinimum service temperature
Certification & Safety
- Chemical resistanceyesResistance to chemicals
Application
- Use caseMould making for polyester and composite 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.| 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 |
|
| Warning | H412 | Harmful to aquatic life with long lasting effects | P273 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.