Description
This premium water clear translucent silicone rubber cures at room temperature and shrinkage is negligible.
It cures in 12 hours with a final Shore hardness of 12A and features exceptional tear and tensile strength. It is ideal for prototyping, jewelry and cut-molds where model visibility is important.
Materials like urethane, epoxy, or polyester resins can be cast without the use of a release agent.
Wax and low melt metal alloys can also be cast.
SORTA-Clear™ 12 can be pigmented with Silc Pig™ pigments.
Technical Properties
- Mix Ratio By Volume: 1A:1B
- Mix Ratio By Weight: 1A:1B
- Pot Life: 40 minutes
- Cure Time: 12 hours
- Shore Hardness: 12A
- Specific Gravity: 1.07 g/cc
- Specific Volume: 0.93 cm³/g
- Color: Water Clear Translucent
- Tensile Strength: 2.21 MPa
- 100% Modulus: 158.58 kPa
- Elongation @ Break: 590%
- Die B Tear Strength: 14.0 kN/m
- Mixed Viscosity: 6,000 mPa·s
Instructions
Safety
Use proper ventilation. Wear safety glasses, long sleeves, and vinyl gloves. N.B. latex gloves will inhibit the cure of the rubber.
Storage and Use
Store and use at room temperature (23°C). Warmer temperatures reduce working and cure time.
Storing at cooler temperatures will extend the shelf life.
Cure Inhibition
Inhibition may occur with contaminants like latex, tin-cure silicone, sulfur clays, and certain wood surfaces. Test compatibility on a non-critical area.
Seal the object with a clear acrylic lacquer to prevent inhibition. Allow the sealer to dry before applying the rubber.
When in doubt, a small test application to determine suitability for your project is recommended.
When working with modeling clays that contain heavy amounts of sulfur, even a sealer will not suffice. Do a small scale test for compatibility before starting your project.
Applying A Release Agent
The use of a release agent is usually not necessary, but will help with the ease of demolding. Use Ease Release™ 200. Spray the object once, then brush lightly over the surface, spry once more lightly and let dry for 30 minutes.
Test on an identical surface if unsure.
Measuring & Mixing
Pre-mix Part B thoroughly.
Disperse equal amounts of Parts A and B in a mixing container and mix for 3 minutes. Make sure to scrape sides and bottom of the container repeatedly.
Vacuum degassing is recommended to remove air. Vacuum until material rises and implodes, then vacuum for 1 minute more.
Pouring, Curing & Mold Performance
Pour mixture at the lowest point of the mold. Allow to cure for 12 hours at room temperature.
Do not cure below 18 °C. Use mild heat to reduce demold time, but note that rubber will darken with heat.
Post cure by exposing to 80°C for 2 hours and 100°C for 1 hour. Allow to cool before use.
Using The Mold
New molds have natural release characteristics. No release agent is needed for wax or gypsum. Use Ease Release™ 200 for polyurethane, polyester, and epoxy resins to extend mold life.
Mold Performance & Storage
The mold's life depends on it's use. Abrasive materials like concrete erode detail faster. Clean the molds with a soap solution and dry them before storage. Assemble multi-part molds before storage and keep them on a level surface in a cool, dry place.
