Ransom & Randolph have a Clear silicon rubber, it is a premium water white translucent silicone rubbers which cure at room temperature with negligible to zero shrinkage.
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Ideal for model and mold making applications
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Provides casters with:
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Excellent durability over time
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Excellent stability over time
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Zero shrinkage
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Mixing ease
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Increased production speed
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Clear Silicone Mould Liquid
Want to make moulds without the traditional vulcanisation method? Look no further!
Ransdom and Randolph clear rubbers are premium water white translucent silicone rubbers (with catalyst) which cure at room temperature with negligible shrinkage.
Clear silicones are ideal for making prototype, jewelry or other moulds of any configuration where model visibility is important (i.e. extracting a model from the mould via cutting). Materials such as urethane, epoxy or polyester resins can then be cast into the silicone without application of a release agent. Other materials such as wax and low temperature materials can also be cast into straight into the mould.
Safety – Use in a properly ventilated area (“room size” ventilation). Wear safety glasses, long sleeves and rubber gloves to minimize contamination risk. Wear vinyl gloves only. Latex gloves will inhibit the cure of the rubber.
Store and use material at room temperature (73°F/23°C). Warmer temperatures will drastically reduce working time and cure time. Storing material at warmer temperatures will also reduce the usable shelf life of unused material. These products have a limited shelf life and should be used as soon as possible.
RTV2 Silicone Rubber | Mixing Ratio | Form | Color | Working Time | Setting Time | Hardness (ShA) |
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HT33 | 1:1 | Liquid | Transparent | 20-22 minutes | 3 hours | 33 ± 2 |
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A pourable addition curing, two-component silicone that vulcanizes at room temperature
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Special Features
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Excellent long term stability of the mechanical characteristics of the hardened rubber
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Durability
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Precision in reproduction
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Applications
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Mold making
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Jewelry
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Artificial stones
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Concrete molding
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Cure Inhibition – Addition-cure silicone rubber may be inhibited by certain contaminants in or on the pattern to be molded resulting in tackiness at the pattern interface or a total lack of cure throughout the mold. Latex, tin-cure silicone, sulfur clays, certain wood surfaces, newly cast polyester, epoxy or urethane rubber may cause inhibition. If compatibility between the rubber and the surface is a concern, a small-scale test is recommended. Apply a small amount of rubber onto a non-critical area of the pattern. Inhibition has occurred if the rubber is gummy or uncured after the recommended cure time has passed.
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.
To prevent inhibition, one or more coatings of a clear acrylic lacquer applied to the model surface is usually effective. Allow any sealer to thoroughly dry before applying rubber. 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 – Although not usually necessary, a release agent will make demolding easier when pouring into or over most surfaces. Ease Release™ 200 is a proven release agent for making molds with silicone rubber. Mann Ease Release™ products are available from Smooth-On or your Smooth-On distributor.
nd parts will begin to stick. No release agent is necessary when casting wax or gypsum. Applying a release agent such as Mold Release prior to casting polyurethane, polyester and epoxy resins is recommended to maximize mold life.
Mold Performance & Storage – The physical life of the mold depends on how you use it (materials cast, frequency, etc.). Casting abrasive materials such as concrete can quickly erode mold detail, while casting non-abrasive materials (wax) will not affect mold detail. Before storing, the mold should be cleaned with a soap solution and wiped fully dry. Two part (or more) molds should be assembled. Molds should be stored on a level surface in a cool, dry environment.
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