Wacker Elastosil® M 4644 A/B – Transparent Addition Silicone for Prototyping & Mould Making
Wacker Elastosil® M 4644 A/B – Transparent Addition Silicone for Prototyping & Mould Making
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Variant: 1.1kg. Set [1 kg. A + 100 gr. B)
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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
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Premium Transparent Addition-Cure Silicone for Professional Prototyping and Mould-Making Applications
Elastosil® M 4644 A/B is a pourable, addition-cure (platinum-cure) two-component silicone rubber that vulcanises at room temperature; curing can be accelerated considerably with heat. The silicone has a medium hardness of Shore A 40, good transparency once cured and cures without shrinkage (linear shrinkage ≤ 0.1%). With a mix ratio of 10:1 by weight, a mixed viscosity of approx. 50,000 mPa·s and a pot life of 90 minutes, this material offers ample working time, becoming tack-free after approx. 12 hours at 23 °C. The silicone exudes a small amount of oil, which aids release, and it is highly resistant to casting resins such as polyurethane and epoxy, giving moulds a very long service life. Its core application is vacuum casting for rapid prototyping.
Key Benefits
- Shore A hardness 40 – medium hardness that combines dimensional stability with enough flexibility to demould models with undercuts.
- Tear strength > 25 N/mm – high tear resistance for moulds that have to withstand many demoulding cycles.
- Tensile strength 5.5 N/mm² – robust mechanical properties for a long mould life.
- Elongation at break 400% – plenty of stretch for demoulding complex geometries without tearing.
- Linear shrinkage ≤ 0.1% – shrink-free curing for dimensionally accurate castings and precise reproduction.
- Mixed viscosity 50,000 mPa·s – a free-flowing mix that accurately reproduces detail and undercuts.
Typical Applications
- Vacuum casting for rapid prototyping of polyurethane and epoxy parts.
- Production moulds with a long service life for casting resins.
- Reproduction of models with fine details and undercuts.
- Prototype building in industrial design and product development.
- Moulds for small series in polyurethane and epoxy systems.
Processing Instructions
- First stir Part A and Part B thoroughly, each separately.
- Mix Part A and Part B at a ratio of 10:1 by weight. Only use A and B together if they have the same batch number.
- Mix slowly and thoroughly (figure-of-eight motion or mechanically at low speed) until the mix is homogeneous and free of streaks.
- Preferably degas the mix under vacuum to remove trapped air.
- Pour the mix within the pot life of 90 minutes.
- Allow to cure for approx. 12 hours at 23 °C. Curing can be accelerated considerably with heat.
Note on Addition-Cure Silicones
Addition-cure (platinum-cure) silicones are sensitive to inhibition. Substances such as condensation-cure silicones, sulphur-containing clays, latex, and tin- and amine-containing compounds can delay or prevent curing. If in doubt, always test on a small area first before casting the entire model.
About the Manufacturer
Wacker Chemie AG is a global market leader in the development and production of silicones for industrial and technical applications.
Professional Support
Our specialists will be pleased to advise you on vacuum casting and mould making with Elastosil® M 4644 A/B. This product is intended for the business market. For larger quantities or custom products, please contact us at info@siliconesandmore.com.
Product Properties
- Hardness40Shore AHardness of the silicone material
- Shrinkage0.1%Linear shrinkage after curing
- ColorTranslucentColor of the finished product
- TransparencyTranslucentDegree of transparency
- Viscosity50000mPa·sViscosity of the uncured silicone
- Density1.07g/cm³Density of the cured material
- Mix ratio10:1Mixing ratio A : B
- Tensile strength5.5MPaMaximum tensile force before breaking
- Tear strength25.0kN/mResistance against tearing
- Elongation at break400%Maximum stretch before breaking
- Pot life90minutesWorking time after mixing
- Cure time720minutesTime until full cure
Physical Properties
- Flash point307°CMin. temperature at which the product ignites
Component Properties
- Color ATranslucentColor of component A
- Color BColorlessColor of component B
- Viscosity A70000mPa·sViscosity of component A
- Viscosity B500mPa·sViscosity of component B
- Density A1.08g/cm³Density of component A
- Density B0.97g/cm³Density of component B
Application
- Use caseVacuum casting for rapid prototypingIntended use
- Silicone type["Addition cure","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
According to the safety data sheet, Elastosil® M 4644 A/B is not classified as a hazardous substance or mixture under normal and intended use. No GHS labelling is required. Please note that the product can release hydrogen gas when it comes into contact with water, alcohols, acids, bases, metal salts, and amines, among other substances. Observe general hygiene measures for handling chemical substances. The use of protective gloves (nitrile, thickness greater than 0.1 mm, or butyl, thickness greater than 0.3 mm) and safety glasses according to EN 166 is recommended. In case of atomisation or aerosol formation, suitable respiratory protection is advisable. Always consult the full safety data sheet for complete information on safe use, storage, and processing.| Safety Pictograms | Safety Data Sheets (SDS) |
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Required protection (ISO 7010)
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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.