Why choose platinum-cure silicone? Platinum silicones are silicone rubbers that cure through an addition reaction with a platinum catalyst, hence the name addition-hardening silicone . This reaction produces no byproducts, resulting in a stable structure with very low shrinkage , high tear resistance , and a flexible, rubbery end product,...
The Silicone Foam Closed Cell 5 is a 2-component (Platinum) Poly-Addition casting silicone that cures at room temperature and foams up to 5 times its volume. This silicone can of course also be colored with silicone dye.This silicone is used...
Zhermack SFX 00-20 – Ultra-flexible silicone for realistic applications Discover Zhermack SFX 00-20, a colorless, biocompatible silicone rubber with exceptional stretchability and softness. This high-quality 2-component platinum-cured addition silicone is specially developed for applications where realistic skin textures, extreme flexibility...
ELASTOSIL® FX platinum-cure silicone rubbers are used to create realistic skin effects in film, television and theater. Use the range of base rubbers, gels and additives to reach astonishing results for: FX make-up / lifecasting, Masks, Body parts /prosthetic effects,...
Semsil HTV Platinum Silicone Top Quality HTV Platinum Silicone – Your Ultimate Solution for Versatile Applications! Are you in need of high-performance HTV (High Temperature Vulcanized) silicone that meets the stringent requirements of the FDA 21 CFR Section 177.2600? Look...
The Silicone Foam Open Cell 6 is a 2-component (Platinum) Poly-Addition casting silicone that cures at room temperature and foams up to 6 times its volume. This silicone can of course also be colored with silicone dye.This silicone is used...
Castable, Addition curing, 2 component silicone rubber that vulcanizes at room temperature. Main application: mold making, encapsulation of electrical and electronic components, coating, engineering production molded parts • Easy to process due to low viscosity• Fast and shrink-free curing at...
The Silicone Foam Closed Cell 3 Spreadable is a 2-component (Platinum) Poly-Addition casting silicone/ spreadable silicone that cures at elevated temperature and foams up to 3 times the volume. This silicone can of course also be colored with silicone dye.This...
WACKER SilGel® 612 A/B is a pourable, addition-curing, RTV-2 silicone rubber that vulcanizes at room temperature to a very soft silicone gel. Main application:- Electronic Control Unit (ECU)- Electronics- Heating, Ventilation, Air Conditioning (HVAC)- Potting & Encapsulation- Power Control Unit (PCU)...
The Stensil ECO 50 malleable silicone, is a 2 component (Poly-Addition) silicone that cures at room temperature. The silicones are very easy to mix and process by hand. The silicones are ready for use after just 5 minutes. Easy to...
A colorless, very soft and stretchable silicone ideally suited for masks, robotics and similar projects. Colourless Low shrinkage <0.1%. Good fluidity Self-ventilating Usable on the skin Very soft Extremely stretchy 850% Mixing of components 1:1 according to weight ratios very...
The Silicone Foam Open Cell 7 Spreadable is a 2-component (Platinum) Poly-Addition casting silicone that cures at elevated temperature and foams up to 7 times its volume. This silicone can of course also be colored with silicone dye. This is...
ELASTOSIL® RT 629 A/BRoom Temperature Curing Silicone Rubber (RTV-2). Castable, addition-curing, two-component silicone rubber that vulcanizes at room temperature.Main application: making antistatic pressure pads also known as printing tampons. Properties• Antistatic finish• Very good fluidity• High reactivity for fast demoulding...
ELASTOSIL® C 1200 A/B has been specially developed for the professional production of reusable vacuum bags for the production of composite parts. Due to its shear thinning behavior it is self-levelling, but does not run off vertical surfaces. The medium...
The Wacker Elastosil M 4641 is a two-component casting silicone. This silicone cures at room temperature. These silicones are food safe! These silicones are used a lot, especially in prototyping. Because the original can be seen reasonably well in the...
Speed up the standard curing time of the Wacker Elastosil FX silicone by adding the FX Fast. First weigh and mix the required amount of silicone as described. Then add the Wacker Elastosil FX Fast in the desired amount. Then...
The Silicone Gel 840 is a 2-component (Platinum) Poly-Addition molding silicone that cures at room temperature to a clear colorless gel. The silicones are very fluid after mixing. The silicone can take on a very faint yellowish glow over time...
True Skin 20 - Professional Platinum Silicone Elastomer This is a castable, two-component, addition-curing silicone elastomer system. After mixing parts A and B in the correct proportions, the system will cure at ambient temperature within 24 hours, but the cure...
Description This is a castable, two-component, addition-curing silicone elastomer system. After mixing parts A and B in the correct proportions, the system will cure at ambient temperature within 24 hours, but the cure rate can be accelerated by applying heat....
Wacker Elastosil M 4600 AB - Professional RTV-2 Silicone Elastosil M 4600 AB is a high-quality 2-component RTV silicone rubber from Wacker that cures at room temperature to a flexible, durable rubber. Product features: RTV-2 system - Room Temperature Vulcanizing...
Platinum SiliconeQM 272 – High-quality casting silicone for professional use Key Features Relatively high hardness for silicone rubber Low shrinkage <0.1% for dimensionally stable results Good fluidity and self-venting during processing Suitable for hard but flexible molds Excellent resistance to...
Platinum silicones are silicone rubbers that cure through an addition reaction with a platinum catalyst, hence the name addition-hardening silicone . This reaction produces no byproducts, resulting in a stable structure with very low shrinkage , high tear resistance , and a flexible, rubbery end product, ideal for precision silicone molds.
Platinum silicones, also known as RTV2 addition silicones, combine dimensional stability with pleasant processing. They are available as clear or colorless variants and as a castable, brushable or kneadable system for a variety of projects.
Addition-hardening casting rubbers are a specific class of silicone rubbers that, after curing, produce a beautiful, rubbery, and flexible result. They are also known as platinum silicone or RTV2 silicone .
Curing mechanism: Platinum-catalyzed addition reaction, curing at room temperature. Gentle heat can accelerate curing if the product allows it.
For: Mold makers, restoration and sculpting studios, prop and SFX workshops, culinary artists, and serious beginners looking for skin-friendly, low-shrinkage silicone molds.
Key Benefits
✓Stable curing addition reaction with platinum catalyst for durable structure
✓Flexibility - highly flexible without loss of integrity
✓Low shrinkage, accurate fit and repeatability over many castings
✓Skin and food many qualities are skin friendly and suitable for food contact
✓Processing freedom: pourable, brushable, kneadable, clear and beautifully pigmentable
Application methods
→Castable for high detail negatives, casting in thin stream
→Brushable with thixotropic agent for vertical surfaces
→Kneadable putty for quick hand molds and impression molds
→Can be applied by brushing or troweling for thin layers and coatings
Processing & Curing
Ideal Conditions
Temperature: Work around 20 to 25°C on clean, dry models.
Environment: Avoid drafts and extreme temperatures, observe pot life and disassembly time.
For food contact: re-cure when recommended
Allow to harden completely at room temperature
Gentle heat can accelerate curing
Modifiers
Thixotropic agent creates a non-sagging, brushable mixture for layer construction.
Deadener softens platinum silicone toward a gel feel for prosthetics and SFX.
Pigments and effects for platinum silicone
Glow in the dark powder, glitter, magnetic powder
Inhibition Checklist
Warning: Silicone addition can be inhibited by contaminants. Always test small amounts and avoid:
Sulphur-containing clay, latex and natural rubber
Certain amines and not fully cured epoxy
Fresh paint and tin residue from condensation silicone
Contaminated tools or models
Advice: Keep models and tools clean and always test on a small area.
Tips for the Best Result
Mixing & Processing
→ Weigh by weight and mix thoroughly
→ Scrape the sides and bottom of the cup
→ Deaerate under vacuum or pour in a thin stream
Mold Making Techniques
→ Seed and prime porous masters
→ Choose the correct release agent per system
→ Build brush molds in thin layers
Food contact
→ Use only suitable qualities
→ Perform prescribed post-hardening
→ Follow instructions carefully
Compatibility with Resins and Casting Materials
Additive silicones are widely applicable with epoxy, polyurethane, and polyester . The combination of low shrinkage and high tear resistance makes them suitable for repeated casting.
Important: For porous models, use a suitable release agent per system and follow the recommendations per product.
Frequently Asked Questions (FAQ)
What are addition hardening casting rubbers?
Platinum-catalyzed silicone that cures at room temperature to a flexible rubber with very low shrinkage and high tear resistance.
What is the difference between addition and condensation silicones?
Addition silicones offer low shrinkage and consistent properties but can be inhibited by sulfur, latex, and some amines. Condensation silicones are often more cost-effective and easier to process but may shrink slightly over time.
Are these silicones skin-friendly or suitable for food contact?
Many platinum silicones are suitable for skin contact, and specific lines are suitable for food contact. Use only products that clearly indicate this and follow the instructions, including post-curing.
How do I make a brushable platinum silicone?
Add a thixotropic agent to a compatible base, create a non-sag mixture, and apply several thin coats. Allow each coat to set before applying the next.
Getting Started
Explore our range of addition-hardening silicones. Choose clear or soft, brushable or pourable. Add thixotropic agents or deadeners as needed and start creating a precise silicone mold today.