Description
This translucent platinum silicone is mixed 1A:1B by volume, eliminating the need for a weighing scale. It features a low viscosity, making vacuum degassing unnecessary for most applications. With a pot life of 3 minutes and a cure time of 12 minutes at room temperature, it cures into a soft, strong rubber that is tear-resistant and exhibits very low long-term shrinkage.
Features
- Mix Ratio By Volume: 1A:1B
- Mix Ratio By Weight: 1A:1B
- Pot Life: 3 minutes
- Cure Time: 12 minutes
- Shore Hardness: 19 A
- Specific Gravity: 1.08 g/cc
- Specific Volume: 0.93 cm³/g
- Tensile Strength: 2.90 MPa (420 psi)
- Elongation @ Break: 470%
- Die B Tear Strength: 15.8 kN/m (90 pli)
- Color: Translucent
- Useful Temperature: -54°C to 232°C (-65°F to 450°F)
- Shrinkage: 0.001 mm/mm
- Mixed Viscosity: 11,000 mPa·s
Molds made with this silicone will last a long time and are suitable for casting wax, gypsum, resins, and other materials. An infinite number of color effects can be achieved by adding compatible silicone pigments or effects powders. It is heat resistant up to 232°C (450°F) and suitable for casting low-melt metal alloys. Cured silicones have been tested and certified skin safe by an independent laboratory. Note: This product will not cure against surfaces containing sulfur, even when sealed.
Instructions
Safety
Use in a properly ventilated area. Wear safety glasses, long sleeves, and rubber gloves to minimize contamination risk. Use vinyl gloves only, as latex gloves will inhibit the cure.
Storage
Store and use material at room temperature (23°C/73°F). Warmer temperatures will reduce working and cure time and decrease the shelf life of unused material. Use as soon as possible.
Cure Inhibition
Silicone rubber may be inhibited by certain contaminants, resulting in tackiness or lack of cure. Latex, sulfur clays, certain wood surfaces, newly cast polyester, epoxy, or urethane rubber may cause inhibition. Test compatibility by applying a small amount of rubber onto a non-critical area. If inhibition occurs, apply a clear acrylic lacquer to the model surface and allow it to dry thoroughly before applying rubber.
Because no two applications are quite the same, a small test application to determine suitability for your project is recommended if performance of this material is in question.
Note: Even with a sealer, platinum silicones will not work with modeling clays containing heavy amounts of sulfur. Do a small scale test for compatibility before using on your project.
Applying A Release Agent
A release agent can make demolding easier. Ease Release™ 200 is recommended for releasing silicone from silicone or other surfaces. Conduct a small test application to determine suitability.
Measuring & Mixing
Pre-mix Part A and Part B separately. Dispense required amounts into a mixing container (1A:1B by volume or weight) and mix thoroughly, scraping the sides and bottom of the container.
Optional: Vacuum Degassing
Vacuum degassing helps eliminate entrapped air. After mixing, vacuum material at 29 inches of mercury, leaving room for expansion.
Pouring
Pour mixture in a single spot at the lowest point of the containment field. Let the rubber seek its own level. Ensure the liquid rubber levels off at least 1.3 cm (1/2 inch) over the highest point of the model surface.
Curing
Allow rubber to cure for 12 minutes at room temperature (23°C/73°F) before demolding.
Heat Curing
Reduce demold time with mild heat. After pouring at room temperature, place the mold in a hot box or oven at 60°C (140°F). Time will vary depending on mold thickness.
Making a Brush On Mold?
Use a thickener for brush-on application and effects. Do not use other series silicones for brush-on mold making.
Mold Performance & Storage
The physical life of the mold depends on usage. Casting abrasive materials can erode mold detail, while non-abrasive materials will not. Clean molds with a soap solution and dry before storage. Store molds on a level surface in a cool, dry environment.
