Description
This brushable, tin-cure silicone rubber self-thickens and is suitable for creating fast brush-on molds of almost any model. It holds vertical surfaces and reproduces fine details. Mixed at a ratio of 100A:10B by weight, it quickly develops thixotropy and can be applied with a brush or spatula. The working time is 30-45 minutes, with a re-coat time of 60-90 minutes, depending on humidity. The cure time after the final layer is 16 hours at room temperature.
The silicone will not stick to most surfaces and cures with negligible shrinkage to a strong, flexible Shore 30A rubber. Four thin layers are sufficient to make a strong and durable production mold for casting wax, gypsum, concrete, or resins. Applications include reproducing sculpture, architectural restoration, and candle molds.
Features
- Holds vertical surfaces
- Requires only four thin layers for a durable mold
Technical Properties
- Mix Ratio By Weight: 100A:10B
- Pot Life: 30 minutes
- Cure Time: 16 hours
- Shore Hardness: 30A
- Specific Gravity: 1.18 g/cc
- Specific Volume: 0.85 cm³/g (23.5 cu. in./lb.)
- Thin Film Recoat Time: 60 minutes
- Color: White
- Tensile Strength: 3.98 MPa (577 psi)
- Elongation @ Break: 300%
- Die B Tear Strength: 21.9 kN/m (125 pli)
- Applicable temperature range: -54°C to 204°C (cured product)
- Shrinkage: 0.002 mm/mm
- Mixed Viscosity: Brushable
Instructions
Mixing and Application
Weigh Part A & B components using a gram scale. A small test application is recommended to determine suitability. Mix thoroughly for 3 minutes, ensuring to scrape the sides and bottom of the container.
Safety
Use in a well-ventilated area. Wear safety glasses, long sleeves, and rubber gloves. Use vinyl gloves only, as latex gloves will inhibit curing.
Storage
Store and use at room temperature (23°C/73°F). Warmer storage reduces shelf life. Use as soon as possible.
Sealer / Release Agent
Inhibition may occur with sulfur-based clays. Test compatibility by applying a small amount of rubber to a non-critical area. Use a barrier coat of clear acrylic lacquer if needed. Ease Release™ 200 is recommended for easier demolding.
Applying The Rubber
Apply in layers, with four thin layers (minimum 9.5 mm) being suitable for a strong mold. Use a stiff brush for the first coat to capture detail. Allow the first coat to become tacky before applying the next. Adding Silc-Pig™ silicone pigment can help distinguish layers.
Options
Add Thi-Vex™ thickener for greater thixotropy. Add Silicone Thinner™ to lower viscosity, not exceeding 10% by weight.
Support Shell
A rigid support shell is necessary once the mold is cured. Plasti-Paste™ is ideal for this purpose.
Curing
Allow curing for at least 16 hours at room temperature. Post-curing at 65°C (150°F) for 4 hours can eliminate residual moisture and alcohol.
Casting
Suitable for casting low-temperature melt metal alloys, gypsum, wax, concrete, and various plastics. Avoid platinum cure silicone rubbers.
Using The Mold
Applying a release agent before casting can facilitate demolding and extend mold life. Ease Release™ 200 or 205 is recommended for resins, and In & Out™ II for concrete.
Mold Performance & Storage
Fully cured molds are durable. The mold's life depends on usage. Clean with soap solution and dry before storage. Store on a level surface in a cool, dry environment.
