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,...
Premium HTV Platinum Silicone: FDA 21 CFR 177.2600 compliant, Colorless and easy to pigment. Shore A 40,60,80. Ideal for food, and industrial applications. High durability, temperature resistance, and chemical resistance. Perfect for versatile uses.
✔ Foam factor 6
✔ Hardness Shore C 4
✔ Open cell structure
✔ Mixing ratio (Weight) 100:100
✔ Working time 2 minutes
✔ Curing time 2 hours
✔ Density 0.193 g/cm³
✔ Easy to process due to low viscosity
✔ Fast and shrink-free curing at room temperature
✔ Low Shore A hardness (approx. 25)
✔ High elongation, excellent tensile strength
✔ Excellent tear strength
✔ Cured rubber is transparent and colourless
✔ Foam factor 7
✔ Spreadable
✔ Hardness Shore C 5-10
✔ Flame retardant UL94-V0
✔ Open cell structure
✔ Mixing ratio (Weight) 100:100
✔ Working time 2 minutes
✔ Curing time 70 min @ 60°C
✔ Density 0.162 g/cm³
✔ Suitable for the production of reusable silicone vacuum bags.
✔ Fast curing at room temperature
✔ No chemical shrinkage
✔ Resistance to epoxy resins
✔ Resistance to polyester
✔ Two components 1:1
✔ blue / Transparent
✔Antistatic surface
✔Good fluidity
✔High reactivity, even when large amounts of silicone oil are added
✔Fast and shrink-free curing at room temperature
✔Medium hardness (Shore A approx. 31)
✔Excellent mechanical properties
✔ 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
✔ Flexible, Strong
✔ Beige
✔ Shore (A) 70 (Hard)
✔ Viscosity 35,000 mPa s
✔ 60 minutes working time
✔ Mixing ratio by weight: 100:10
✔ Good resistance to resins
✔ Flexible, Strong
✔ Beige
✔ Shore (A) 70 (Hard)
✔ Viscosity 35,000 mPa s
✔ 60 minutes working time
✔ Mixing ratio by weight: 100:10
✔ Good resistance to resins
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.
