Wacker Elastosil M 4641® A/B – Transparent Addition Silicone Rubber for Prototyping & Vacuum Casting

Product form

Wacker

Wacker Elastosil M 4641® A/B – Transparent Addition Silicone Rubber for Prototyping & Vacuum Casting

✔ High-quality silicone from Wacker
✔ Fast and non-shrink curing at room temperature
✔Shore A 43
✔ Transparent
✔High tear strength
✔ Food safe (FDA)
✔ Excellent resistance to casting resins
✔ Very suitable for clear casting resins Read more

€634,95 Incl. BTW

SKU: S11227

30-day return period

More than 100,000 satisfied customers

Pay afterwards with Klarna

Lowest Price Guarantee on Silicones– We match the price +5% extra discount

This product is ordered regularly

Make a choice

22 kg. Set (20 A + 2 B)
220 kg. Set (200 A + 20 B)
5,5 kg. Set ( 5 A + 0,5 B)

22 kg. Set (20 A + 2 B)

€634,95

€28,86/kg

220 kg. Set (200 A + 20 B)

€6.598,00

€29,99/kg

5,5 kg. Set ( 5 A + 0,5 B)

€169,95

€30,90/kg

✅ Lowest Price Guarantee – Europe
Found this silicone product cheaper elsewhere in Europe? We match the price + 5% extra discount. Terms

Do you have a question about this product?

Contact Us

✔ High-quality silicone from Wacker
✔ Fast and non-shrink curing at room temperature
✔Shore A 43
✔ Transparent
✔High tear strength
✔ Food safe (FDA)
✔ Excellent resistance to casting resins
✔ Very suitable for clear casting resins

Premium Transparent Addition-Curing Silicone Rubber for Professional Prototyping and Vacuum Casting Applications

The Wacker Elastosil M 4641 A/B is a pourable, addition-curing (platinum-cure) two-component RTV-2 silicone rubber that vulcanizes shrink-free at room temperature and can be considerably accelerated by applying heat. The highly transparent, translucent vulcanizate has a Shore A hardness of approximately 43, a mixing ratio of 10:1 by weight, a pot life of 90 minutes and a curing time of 12 hours at 23 °C. Thanks to its outstanding resistance to polyurethane and epoxy resins and its oil-free, dry surfaces, this product is ideally suited for vacuum casting and rapid prototyping, especially when crystal-clear casting resins are used.

Key Benefits

Shore A 43: → medium-hard flexibility combining dimensional stability with easy demolding of models with undercuts.
Pot life 90 minutes: → ample working time for deairing and casting larger or complex molds.
Shrinkage < 0.1 %: → accurate, dimensionally stable reproductions without chemical shrinkage during curing.
Tensile strength > 4.5 N/mm² and tear strength > 25 N/mm: → high mechanical strength for long service life and many reproductions per mold.
Resistance to polyurethane and epoxy: → suitable for repeated casting of aggressive resins without degradation of the mold surface.
Food-safe (FDA and BfR compliant): → suitable for the manufacture of food contact materials when processed correctly.

Typical Applications

Vacuum casting for rapid prototyping with polyurethane and epoxy resins.
Crystal-clear casting resins requiring an oil-free mold surface.
Reproduction of models with undercuts and fine details.
Food-safe molds for culinary applications.
Prototype molds in product development and industrial design.

Processing Instructions

Stir the A and B components separately and thoroughly before use.
Mix by weight in a ratio of 10 parts A to 1 part B. Note: only use A and B components with the same batch number.
Stir slowly and without introducing air, preferably in a figure-8 motion, until a homogeneous mixture is obtained.
Preferably deair the mixture under vacuum to remove air bubbles.
Cast within the pot life of 90 minutes.
Allow to cure for 12 hours at 23 °C. Curing can be accelerated by heating; after demolding, optionally post-cure the mold for 2 to 3 hours at 100 °C to fully degas it.

⚠️ Note – inhibition with addition-curing silicones: This is a platinum-cure addition silicone. Curing can be inhibited by sulfur, nitrogen, amino compounds and metal salts. These substances occur, among others, in many latex gloves, some plasticines, paints, adhesives, condensation silicones, one-component silicone sealants, natural rubbers and 3D printing material (especially stereolithography). If you are unsure whether your materials (including gloves, spatulas and cups) contain these substances, first carry out a small test. If you still wish to mold an inhibited surface, first apply a protective layer of polyvinyl alcohol.

This product is intended for the business market. For larger quantities or custom products, please contact us at info@nedform.com or +31 (0)46-3030989.

Wacker Chemie AG is the world market leader in the development and production of silicones for industrial and technical applications.

Professional Support

Do you have questions about processing the Elastosil M 4641 A/B, its suitability for your casting resins or preventing inhibition? Our specialists are happy to assist you. Contact us for personal advice.

Safety Information

The Wacker Elastosil M 4641 A and B are not classified as hazardous under the CLP Regulation and do not require GHS labeling under normal use. Component B can form hydrogen gas on contact with water, alcohols, acids, amines and metal salts; avoid contact with these substances and keep the packaging tightly closed. When processing, wear protective gloves made of nitrile or butyl rubber (in accordance with EN374) and safety goggles (in accordance with EN166). Ensure adequate ventilation. In case of mist or aerosol formation, additional respiratory protection (FFP1, EN149) is recommended. For full safety information, please refer to the safety data sheets for components A and B.

Safety Pictograms	Safety Data Sheets (SDS)
	📥 EN SDS ELASTOSIL M 4641 A 📥 EN SDS ELASTOSIL M 4641 B

More information about H and P statements: UK HSE &ECHA

Our story

Our story began with our father, the founder of Nedform BV. We— Roel, Rutger, and Rob Collaris —are his sons and wanted to bring his passion and knowledge to the online world. That's how SAM (Silicones and More) was born—a creative space for everyone.

Whether you're a beginner, an expert, or an enthusiastic DIYer looking for the right tools, materials, and some guidance, you've come to the right place. We've worked with silicones, resins, and casting materials ourselves for years. That's why we not only deliver quality but also genuine support—based on experience.

Small team with a great love for creating

Honest advice and reliable materials!

We help makers bring their ideas to life.

More about us

FAQs

What is the delivery time of my order?

Orders placed and paid for on business days will be shipped on the same day in most cases. Orders received on weekends will be processed on the next business day.

We always do our best to ship orders as quickly as possible, but actual shipping times may vary due to high volume, stock availability, or carrier circumstances.

Delivery time depends on the destination country and the carrier. Below is a general indication:

Netherlands: usually within 1 business day
Belgium & Germany: typically within 1–2 business days
Other countries: depends on the destination and the local carrier

Please note: these are guidelines, not guarantees. The final delivery time may differ due to factors beyond our control, such as sorting center delays, public holidays, or exceptionally high volume.

What is the return policy?

We offer a 30-day return policy as an added service. If you'd like to return an item or if there's something wrong with your order, please email us at info@siliconesandmore.com with your name and order number within 30 days of delivery. We'll help you quickly. The full terms and conditions can be found on our returns page.

How can I track my order?

Once your order has been processed and shipped, you'll receive a track and trace code by email, allowing you to easily track your package. Please note that it can sometimes take up to 24 hours after processing for the track and trace to be active.

I have a problem with my order, how can I reach you?

If you have any questions or run into any problems, please feel free to contact us via our contact page or email us at info@siliconesandmore.com . We'll be happy to help you quickly.

If you want an immediate answer, ask our chatbot. They have extensive knowledge of all our products and can often help you right away!

Can I also order for business purposes?

Yes, business orders are possible . Customers within the EU outside the Netherlands can order VAT-free with a valid EU VAT number (0 percent intra-Community supply).

Enter your VAT number on the shopping cart page , not at checkout.

Go to the shopping cart via the link below and enter your VAT number and email address, after which the VAT will be automatically removed.

https://siliconesandmore.com/cart

Please note that if you only enter your VAT number at checkout, it will not be processed correctly and VAT may still be charged.

Huismerk - SAMSAM Bodycasting Set

Huismerk - SAMPorcelain Plaster – Premium Casting Plaster for Molds & Detailed Casts

WackerWacker Elastosil Vario 15 Normal – Translucent Platinum Silicone for Molds & Prototyping

SAM - Silicones and MoreSilicone Condensation 20 Universal Set – Molding rubber for universal molds

Wacker Elastosil M 4641® A/B – Transparent Addition Silicone Rubber for Prototyping & Vacuum Casting

Wacker Elastosil M 4641® A/B – Transparent Addition Silicone Rubber for Prototyping & Vacuum Casting

Pairs well with