Silicone Addition Colorless 50 – Hard Platinum Silicone for Concrete & Heavy Casting Materials

Premium Hard Silicone for Professional Molds and Heavy-Duty Applications

Silicone Addition Colorless 50 is a 2-component, platinum-cure (addition-curing) casting silicone with Shore A 50 hardness, specifically developed for sturdy, flexible molds for concrete, cement, and other heavy casting materials. This high-quality silicone combines high mechanical strength (8 N/mm² tensile strength) with minimal shrinkage (<0.1%) and good flow properties, ideal for durable molds that can handle high-density materials. Easy 1:1 mixing ratio and adjustable hardness by mixing with Shore A 5 variant.

Key Benefits

• Shore A 50 hardness: Relatively hard, sturdy molds with excellent dimensional stability for heavy casting materials
• High mechanical strength: 8 N/mm² tensile strength and 14 N/mm tear strength for durable molds that can withstand high pressure
• Suitable for high-density materials: Ideal for concrete, cement, and other heavy casting materials without deformation
• Platinum-cure technology: Minimal shrinkage (<0.1%), no inhibition with most substrates, long pot life
• Good flow and self-deaerating: 13,000 mPa·s viscosity for good detail reproduction without vacuum treatment
• Adjustable hardness: Mixable with Silicone Addition Colorless 5 for any desired hardness between Shore A 5-50

Typical Applications

• Concrete molds for precast elements, WetCast, and decorative concrete applications
• Cement and plaster molds for architectural ornaments and restoration
• Candle molds for large, heavy candles and decorative wax objects
• Pad printing stamps and flexible printing applications where hardness is required
• Industrial molds for heavy casting materials and high-pressure applications
• Props and design objects where strength and flexibility are combined

Processing Instructions:

1. Mix components A and B thoroughly in a 100:100 ratio (1:1 by weight) manually or mechanically
2. Stir slowly in a figure-8 motion to prevent air entrapment
3. Process the mixture within the 30-minute pot life
4. Wait for complete curing before demolding (3-6 hours at 20°C)
5. Curing can be accelerated by heating - every 10°C temperature increase roughly halves the time

Customization Options:

• Adjust hardness: Mix with Silicone Addition Colorless 5 for any desired hardness between Shore A 5-50. Example: for Shore A 18.5, mix 70% Shore 5 (35g A + 35g B) with 30% Shore 50 (15g A + 15g B)
• 
• Reduce hardness: Add silicone oil (note: migrates to the surface over time)
• Thicken for troweling: Add Silicone Thixo A or fumed silica
• Coloring: Use silicone dye for intense colors

Silicones and More supplies high-quality silicones for professional mold making, concrete molds, WetCast, and industrial applications.

Important Warning: Inhibition with Addition-Cure Silicones

Please note: This is an addition-cure silicone (platinum-cure). These silicones can be poisoned by sulfur, nitrogen, amino compounds, and metal salts. If you are unsure whether the products you are using (including gloves, spatulas, and cups) contain these ingredients, please perform a small test first. These substances are found in many latex gloves, some plastilines, paints and glues, condensation-cure silicones, 1-component silicone sealants, natural rubbers, and 3D printing materials (especially stereolithography). If you still wish to use these, you will need to apply a protective layer of polyvinyl alcohol (PVA).

Professional Support

Our technical specialists advise on material selection, hardness adjustments, processing techniques, and optimal results for your specific concrete or heavy casting material application. Contact us for technical datasheets, processing guidelines, or advice on inhibition prevention for addition-cure silicones.