Silicone Condensation 20 Universal Set – Mould Rubber for General-Purpose Moulds

Premium Condensation Silicone for Professional Mould Making

Silicone Condensation 20 is a tin-cure silicone rubber with a Shore A hardness of 20, specially developed for making flexible, highly detailed moulds. This medium-hard condensation-cure silicone combines excellent flow with high tensile strength, making it ideal for both simple and complex mould-making jobs. Reliable curing and long-lasting flexibility make it the preferred choice for professionals casting plaster, concrete and wax.

Key Benefits

• Excellent detail reproduction: Low viscosity ensures perfect reproduction of fine details and textures
• High tensile strength: Durable moulds that withstand intensive use and repeated casting
• Dimensionally stable flexibility: Shore A 20 hardness offers the ideal balance between flexibility and dimensional stability
• Wide range of uses: Compatible with plaster, concrete, wax, soap and acrylic resin systems
• Reliable curing: Predictable working time and consistent results at room temperature
• Cost-effective: Excellent value for money for professional and semi-professional applications

Typical Applications

• Plaster moulds: Ornaments, architectural details and decorative elements in plaster and porcelain plaster
• Concrete casting: Precast concrete parts, garden ornaments and wetcast applications
• Candle and soap moulds: Flexible moulds for complex shapes and undercuts
• Acrylic resin casting: Moulds for Jesmonite, Acrylic One and similar water-based resin systems
• Props and set building: Reproductions for theatre, film and events
• Art foundry: Lost-wax models and prototype development

Technical Characteristics

This condensation-cure silicone is supplied as a two-component system with a simple 100:5 mix ratio (base:catalyst). Pot life is approximately 30–45 minutes at 23 °C, with full cure after 24 hours. The cured rubber shows minimal shrinkage and remains flexible over a wide temperature range. Suitable for pouring open moulds and, with a thickener, for brush-on moulds.

Brushing, Spreading or Trowelling

To spread, trowel or brush the silicone, you can add Thixo C (0.6–2%, typically 1%). This thickener allows the silicone to be applied with a spatula. With this method, the mould must be given a support shell made of plaster bandage, epoxy, or acrylic resin with thickener and glass fabric.

SAM (Silicones and More) develops and supplies high-quality silicone elastomers and mould-making materials for professional makers, artists and industrial applications.

Professional Support

Questions about working time, mix ratios or choosing the right material for your application? Our technical team will be happy to advise you on the best silicone system and the right processing techniques for your project.