Description
SORTA-Clear™ 40 is a premium water-clear translucent material with a platinum catalyst.
This material cures at room temperature, shrinkage is negligible.
Parts A and B are measured by weight.
SORTA-Clear™ 40 features a hardness of Shore 40A, high tensile and tear strength.
It is Ideal for making cut-molds for prototypes, jewelry, or other molds where model visibility is important.
Materials such as urethane, epoxy, or polyester resins can be cast without a release agent.
Other materials like wax and low-melting-point metal alloys can also be cast.
SORTA-Clear™ 40 can be pigmented with silicone pigments.
It is certified as food-safe and skin-safe, and it can be used for culinary applications, including casting chocolate and such.
Technical Properties
- Mix Ratio By Weight: 100A:10B
- Working time: 60 minutes
- Cure Time: 16 hours
- Shore Hardness: 40 A
- Specific Gravity: 1.08 g/cc
- Specific Volume: 0.926 cm³/g
- Tensile Strength: 5.52 MPa
- 100% Modulus: 621 kPa
- Elongation @ Break: 400%
- Die B Tear Strength: 21.0 kN/m
- Color: Water Clear Translucent
- Useful Temperature Range: -54°C to 232°C
Instructions
Safety
Use proper ventilion. Wear safety glasses, long sleeves, and vinyl gloves. N.B. latex gloves will inhibit the cure of the rubber.
Storage
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 the prescribed 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
Pour mixture in a single spot at the lowest point of the mold. Let the rubber seek its level over the model. Ensure the liquid rubber levels off at least 1.3 cm (1/2”) over the highest point of the model surface.
Curing
Allow material to cure fully at room temperature (23°C) before demolding. Cures in 16 hours.
Do not cure rubber at temperatures below 18°C.
Time to demold can be reduced with mild heat, but the rubber will darken when exposed to heat.
Allow mold to cool to room temperature before handling.
Post Curing
Post curing will aid in attaining maximum properties.
After curing at room temperature, expose the rubber to 80°C for 2 hours and 100°C for one hour. Allow mold to cool before using. Rubber will darken when exposed to heat.
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.
