Wacker Elastosil® M 4440 Set – Pourable Condensation Silicone for Mold Making & Casting Resin Reproduction
Wacker Elastosil® M 4440 Set – Pourable Condensation Silicone for Mold Making & Casting Resin Reproduction
This product is sold to businesses only
We supply this product exclusively to registered business customers. Request a business account: we review requests within 3 working days, after which you can order this product and pay by invoice.
Why is this product sold to businesses only?
Already have a business account? Sign in
All technical specifications, safety information and data sheets remain available below.
- 30-day returns
- Over 100,000 happy customers
- Pay later with Klarna
- Personal advice from material experts
Question about this product? Our material experts are happy to help you choose the right product. Contact us
Premium Pourable Condensation Silicone for Professional Mold Making and Casting Resin Reproduction Applications
The Elastosil® M 4440 is a pourable, condensation-curing (RTV-2) two-component silicone rubber that cures at room temperature to a final white color with a Shore A hardness of approximately 37. This kit includes the matching hardener Catalyst T 37, which provides a long processing time of approximately 80 minutes and a curing time of approximately 10 hours. Thanks to its very good flowability and self-deaeration, the material effortlessly fills even fine details, while its excellent resistance to polyester and polyurethane resins ensures a long mold life. With a mixing ratio of 3% T37 by weight, this is a reliable all-round molding rubber for cost-effectively producing molds.
Key Benefits
- Shore A hardness 37 – firm yet flexible mold with good dimensional stability and easy demolding.
- Mixing viscosity 20,000 mPa·s – very good flowability and self-deaeration, fills fine surface details without air entrapment.
- Tear strength 4.5 N/mm – excellent resistance to tearing, even with repeated demolding.
- Elongation at break 220% – high flexibility for demolding models with slight undercuts.
- Linear shrinkage 0.4% – limited shrinkage for dimensionally accurate reproductions.
- Pot life 80 minutes with T37 – ample processing time for larger or complex molds.
Typical Applications
- Production molds for casting polyester and polyurethane resins.
- Reproduction of ornaments, statues, and decorative elements.
- Molds for plaster, concrete, and artificial stone.
- Wax and candle molds for artisanal and industrial applications.
- Prototyping and small-series production where dimensional stability is required.
Processing Instructions
- Before use, carefully stir the A-component (silicone base) in its packaging to evenly distribute any settled fillers.
- Weigh the Catalyst T 37 (B-component) by weight: 3% of the A-component amount (3 grams of T37 per 100 grams of silicone).
- Mix both components slowly and thoroughly, scraping the sides and bottom of the mixing container until a homogeneous mixture is formed.
- Preferably deaerate the mixture under vacuum (10–20 mbar) to prevent air entrapment.
- Pour the mixture into the mold in a thin stream from a low height within the pot life of approximately 80 minutes.
- Allow the silicone to cure for approximately 10 hours at room temperature (23 °C). Higher humidity and a higher dosing ratio will shorten the processing and curing times.
Wacker Chemie AG is a world market leader in the development and production of silicones for industrial and technical applications.
Professional Support
Are you unsure if Elastosil® M 4440 is the right choice for your mold or reproduction material? Our specialists are happy to advise you on hardness, resin resistance, and the desired number of casts. Feel free to contact us for personalized advice.
Product Properties
- Hardness37Shore AHardness of the silicone material
- Shrinkage0.4%Linear shrinkage after curing
- ColorWhiteColor of the finished product
- TransparencyOpaakDegree of transparency
- Viscosity20000mPa·sViscosity of the uncured silicone
- Density1.23g/cm³Density of the cured material
- Mix ratio100:3Mixing ratio A : B
- Tensile strength2.5MPaMaximum tensile force before breaking
- Tear strength4.5kN/mResistance against tearing
- Elongation at break220%Maximum stretch before breaking
- Pot life80minutesWorking time after mixing
- Cure time600minutesTime until full cure
Certification & Safety
- Chemical resistanceGood resistance to polyester and polyurethane resinsResistance to chemicals
Application
- Use caseMold making for cast resin reproductionIntended use
- Silicone type["Condensation curing","RTV-2"]Type of silicone or polymer
- Cure speedRoom temperatureHow quickly the material can be demoulded
- Cure conditionKamertemperatuurCondition under which the material cures
Safety Information
Under normal use, the Elastosil M 4440 silicone base is not classified as hazardous. The supplied hardener Catalyst T 37 is classified as hazardous (GHS08, health hazard): H373 may cause damage to organs through prolonged or repeated exposure and H413 may cause long lasting harmful effects to aquatic life. Avoid breathing vapor or spray and avoid release to the environment. When processing, wear suitable protective gloves (butyl rubber), tight-fitting safety glasses, and protective clothing. Ensure good ventilation. In case of nebulization or aerosol formation, use a respiratory mask with an ABEK or ABEK-P2 filter. Do not eat, drink, or smoke during work and wash hands thoroughly after use. For complete information, always consult the Safety Data Sheet (SDS) for both Elastosil M 4440 and Catalyst T 37.| 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.