Wacker Elastosil® M 4630 A/B – White Food-Safe Addition-Cure Silicone for Concrete Molds & Casting Resins
Wacker Elastosil® M 4630 A/B – White Food-Safe Addition-Cure Silicone for Concrete Molds & Casting Resins
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Premium Food-Safe Addition-Cure Silicone for Professional Concrete and Casting Resin Applications
Wacker Elastosil® M 4630 A/B is a pourable, addition-curing (platinum-cure) two-component silicone rubber (RTV-2) that cures shrink-free at room temperature. Curing can be considerably accelerated by applying heat. With a low Shore A hardness of approximately 28, a white final cure and outstanding resistance to concrete, this material is designed for making durable molds. The mixing ratio is 10:1 by weight, the pot life is approximately 90 minutes and the product is tack-free after approximately 12 hours. Thanks to its good flow and self-deaeration, the material delivers sharp, accurate reproductions of models with deep undercuts. Core applications are concrete molds and casting reproduction materials such as casting resins.
Key Benefits
- ✓ Low hardness Shore A28 – supple mold that demolds easily even with deep undercuts
- ✓ High tear strength > 30 N/mm – long mold service life under repeated use
- ✓ Tensile strength 6.5 N/mm² with 700% elongation – withstands mechanical stress during demolding
- ✓ Linear shrinkage < 0.1% – dimensionally accurate reproductions without chemical shrinkage
- ✓ Mixed viscosity 10,000 mPa·s – good flow and self-deaeration for bubble-free molds
- ✓ Food-safe per EC 1935/2004 (BfR XV) – suitable for food contact when properly processed
Typical Applications
- → Molds for casting concrete reproductions with deep undercuts
- → Casting molds for casting resins (epoxy, polyurethane, polyester)
- → Decorative concrete elements and architectural concrete
- → Reproduction of models in restoration and sculpture
- → Culinary molds where food contact is required
- → Prototyping and small-series production of castings
Processing Instructions
- First stir component A and component B separately and thoroughly.
- Mix A and B in a 10:1 ratio by weight. Use A and B only with the same batch number.
- Mix slowly and thoroughly in a figure-8 motion until homogeneous; avoid trapping air.
- Optionally degas the mixture under vacuum for an optimally bubble-free result.
- Pour the mixture within the pot life of approximately 90 minutes.
- Allow to cure for approximately 12 hours at room temperature; curing can be accelerated with heat.
Wacker Chemie AG is the world market leader in the development and production of silicones for industrial and technical applications.
Professional Support
Not sure whether Elastosil M 4630 A/B is right for your concrete or resin casting project? We are happy to help you choose the right silicone for your application. Contact us for advice, samples or larger quantities.
Product Properties
- Hardness28Shore AHardness of the silicone material
- Shrinkage0.1%Linear shrinkage after curing
- ColorWhiteColor of the finished product
- TransparencyOpaqueDegree of transparency
- Viscosity10000mPa·sViscosity of the uncured silicone
- Density1.13g/cm³Density of the cured material
- Mix ratio10:1Mixing ratio A : B
- Tensile strength6.5MPaMaximum tensile force before breaking
- Tear strength30.0kN/mResistance against tearing
- Elongation at break700%Maximum stretch before breaking
- Pot life90minutesWorking time after mixing
- Cure time720minutesTime until full cure
Physical Properties
- Flash point294°CMin. temperature at which the product ignites
Component Properties
- Color ALight grayColor of component A
- Color BWhiteColor of component B
- Viscosity A15000mPa·sViscosity of component A
- Viscosity B800mPa·sViscosity of component B
- Density A1.14g/cm³Density of component A
- Density B1.01g/cm³Density of component B
Certification & Safety
- Food-gradeYesSuitable for food contact
- Chemical resistanceResistant to concrete and casting resinsResistance to chemicals
Application
- Use caseMoulds for concrete and resin castingIntended use
- Silicone type["Addition curing","RTV-2"]Type of silicone or polymer
- Cure speedNormalHow quickly the material can be demoulded
- Cure conditionRoom temperature or heatCondition under which the material cures
Safety Information
Wacker Elastosil M 4630 A/B is not classified as a hazardous substance or mixture under Regulation (EC) No 1272/2008. No GHS labelling is required. The material contains SiH groups and may, under certain conditions, release small amounts of hydrogen; keep it away from strong acids, bases, alcohols and oxidising agents. No respiratory protection is required under normal use. Nitrile rubber or butyl rubber safety gloves, safety glasses to EN 166 and good workplace ventilation are recommended. Do not eat, drink or smoke while working, and wash hands after handling. Always consult the full Safety Data Sheet (SDS) for complete hazard, handling and first-aid information before working with this product.| Safety Pictograms | Safety Data Sheets (SDS) |
|---|---|
| Signal Word | H‑code | Hazard Statement | P‑codes | P‑statements |
|---|---|---|---|---|
| Warning | EUH066 | Repeated exposure may cause skin dryness or cracking | P264 P362+P364 |
|
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.
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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.
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Can I order as a business?
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